The Experts below are selected from a list of 6573 Experts worldwide ranked by ideXlab platform
Minghui Yang - One of the best experts on this subject based on the ideXlab platform.
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ordered mesoporous transition Metal Nitrides prepared through hard template nanocasting and rapid nitridation process
2020Co-Authors: Zhixing Cheng, Tiju Thomas, Ali Saad, Haichuan Guo, Caihong Wang, Siqi Liu, Minghui YangAbstract:Abstract A novel rapid nitridation process has been developed to synthesize a series of ordered mesoporous transition Metal Nitrides (TMNs) from their corresponding mesostructured Metal oxides (TMOs). The TMOs in turn are prepared using mesoporous silica SBA-15, which is used as the hard template. The ordered mesoporous structures contribute to the interaction between ammonia and Metal oxide precursors, which effectively shorten the nitridation time. Moreover, the rapid nitridation process saves time while also suppressing the closure and collapse of the mesoporous structures. To demonstrate the generic capability of the method: ordered mesoporous binary and ternary TMNs (CoN, WN, CrN and Ni3FeN) have been successfully synthesized within 30 min. As a practical application of the materials synthesized thus, mesoporous ternary nitride Ni3FeN is shown to exhibit outstanding oxygen evolution performance with very low overpotential (279 mV) at 10 mA cm−2 geometric current density. The observed performance is a superior performance to the Ir/C benchmark catalyst. The rapid, high yield method demonstrated implications for the production of Nitrides for a wide range of applications in catalysis and beyond.
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Mixed ternary transition Metal Nitrides: A comprehensive review of synthesis, electronic structure, and properties of engineering relevance
2019Co-Authors: Ayesha Khan Tareen, G. Sudha Priyanga, Santosh Behara, Tiju Thomas, Minghui YangAbstract:Ternary transition Metal Nitrides (TTMNs) have acquired substantial attention due to the ability to offer for tuning properties. Furthermore efforts to develop new TTMNs have resulted in the development of new syntheses approaches. In this review, recent progress made regarding investigations on electronic structure, stoichiometry, crystal structures, synthesis and applications are reviewed. Intermediate bonding in these solids exist in the structure types revealed so far. Bonding in these systems are an intriguing mix of ionic (oxide-like) and covalent (carbide-like). This enhances the possibilities of finding unique structures (i.e. anti-fluorite analogous [1]). A good case in point is the Delafosite types and η-Nitrides structures found commonly in TTMNs which are typically associated with ABOx type oxides and carbides. Due to the rich structural chemistry associated with TTMNs, their study is considered a growing area in solid state and applied chemistry. Advancement made in the synthesis of powder and thin film materials of TTMNs are discussed. The powder methods involve the following methods: solid state, high-pressure-high temperature, solvothermal method, ammonothermal method, sol-gel method, Pechini method, temperature-programmed reduction, thermal degradation of Metal complex, solid-state Metal oxide-organic reaction, solid state ion exchange reaction, and electrodeposition replacement method. On the other hand, the TTMN thin film fabrication is based on two types of methods; physical vapor deposition (PVD) and chemical vapor deposition (CVD) method. The PVD involve deposition using different ways using laser or plasma based approaches (eg. pulsed laser deposition (PLD)) and magnetron sputtering. Chemical vapor deposition methods involve electrodeposition reaction method. Among all synthesis methods, the sol-gel process following the ammonolysis is considered comparatively better for large scale production owing to the simple apparatus setup. Different synthesis methods are deployable based on the application at hand. Applications can be range from electrocatalysts in ORR reaction [2,3], electrocatalysts as sensor [4], supercapacitors [2,3,5], solar cell [6], magnetic, superconducting [7], hard coating materials [8] e.g. protective, functional, conductive, wear-resistance and decorative coating, NH3 synthesis [9], and hydrogenation process in hydrocarbon reactions [10].
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synthesis and application of nano structured Metal Nitrides and carbides a review
2018Co-Authors: Sefiu Abolaji Rasaki, Tiju Thomas, B Zhang, Kousika Anbalgam, Minghui YangAbstract:Abstract Transition Metal nitride and carbide have several similarities in their preparatory methods, properties, and applications. Synthetic parameters have remained the main factors that determine the effectiveness of Nitrides and carbides in electrochemical storage devices, photocatalysis, environmental remediation, gas sensing and medicinal agents. This review addresses aspects of relevance to electronic structure and chemical bonding, and recent advances made in the synthesis approaches. The syntheses approaches that are particularly relevant for reducing (i) production cost, (ii) energy consumption, and (iii) synthesis time for these materials systems are discussed in detail. Furthermore some of the recent techniques like solid-solid state separation, carbothermal, gas-phase, electrochemical, sonochemical, solvothermal, sol-gel reaction and solid state reaction that offer new avenues for researchers (including a sustainability-oriented exploration) are mentioned. We discuss synthetically tunable properties (morphology, electronic characteristics, energy storage capacity, corrosion resistance, catalytic ability and gas sensing properties), heat treatment aspects, and relevant applications of these systems. We expect this review to be useful to the ever growing community of researchers that are interested in Nitrides and carbides, and their applications.
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corrosion behavior of mesoporous transition Metal Nitrides
2013Co-Authors: Minghui Yang, Amy J Allen, Minh T Nguyen, Walter T Ralston, Michelle J Macleod, Francis J DisalvoAbstract:The chemical stability of mesoporous transition Metal Nitrides MN (M: Nb, V, Cr, Ti) in water at 80 °C under neutral, acidic, and alkaline conditions is investigated by powder XRD and SEM.
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corrosion behavior of mesoporous transition Metal Nitrides
2013Co-Authors: Minghui Yang, Amy J Allen, Minh T Nguyen, Walter T Ralston, Michelle J Macleod, Francis J DisalvoAbstract:Abstract Transition Metal Nitrides (TMN) have many desirable characteristics such as high hardness and good thermal stability under reducing conditions. This work reports an initial survey of the chemical stability of mesoporous TM Ns ( TM =Nb, V, Cr and Ti) in water at 80 °C at neutral, acidic and alkaline pH. The mesoporous TMNs had specific surface areas of 25–60 m 2 /g with average pore sizes ranging from 10 to 50 nm. The high surface areas of these materials enhance the rate of corrosion per unit mass over that of a bulk material, making detection of corrosion much easier. The products were characterized by Rietveld refinement of powder X-ray diffraction (PXRD) patterns and by scanning electron microscopy (SEM). Several Nitrides have corrosion rates that are, within error, not distinguishable from zero (±1 A/day). Of the Nitrides examined, CrN appears to be the most corrosion resistant under acidic conditions. None of the Nitrides studied are corrosion resistant under alkaline conditions.
Alexandra Boltasseva - One of the best experts on this subject based on the ideXlab platform.
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photonic spin hall effect in robust phase gradient metasurfaces utilizing transition Metal Nitrides
2019Co-Authors: Krishnakali Chaudhuri, Amr Shaltout, Deesha Shah, Urcan Guler, Aveek Dutta, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Robust and high-temperature stable (refractory) transition Metal Nitrides are an emerging class of nanophotonic materials aimed at durable, bio- and CMOS-compatible plasmonic and metasurface applications. In this work, we experimentally demonstrate titanium nitride- and zirconium nitride-based phase manipulating optical metasurfaces that exhibit a photonic spin Hall effect. In the developed all-nitride system, Metal Nitrides are combined with dielectric Nitrides such as aluminum nitride and silicon nitride to design a highly anisotropic, multilayer resonator geometry that supports gap plasmons and enables high power efficiency (∼40%) and broad bandwidth of operation in the near-infrared wavelength region. A one-dimensional phase gradient created by geometric rotations of the resonators leads to simultaneous, spatial separation of right and left circular polarization as well as different frequency components of the incident light. This work shows that transition Metal Nitrides can be successfully integrate...
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Photonic Spin Hall Effect in Robust Phase Gradient Metasurfaces Utilizing Transition Metal Nitrides
2018Co-Authors: Krishnakali Chaudhuri, Amr Shaltout, Deesha Shah, Urcan Guler, Aveek Dutta, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Robust and high-temperature stable (refractory) transition Metal Nitrides are an emerging class of nanophotonic materials aimed at durable, bio- and CMOS-compatible plasmonic and metasurface applications. In this work, we experimentally demonstrate titanium nitride- and zirconium nitride-based phase manipulating optical metasurfaces that exhibit a photonic spin Hall effect. In the developed all-nitride system, Metal Nitrides are combined with dielectric Nitrides such as aluminum nitride and silicon nitride to design a highly anisotropic, multilayer resonator geometry that supports gap plasmons and enables high power efficiency (∼40%) and broad bandwidth of operation in the near-infrared wavelength region. A one-dimensional phase gradient created by geometric rotations of the resonators leads to simultaneous, spatial separation of right and left circular polarization as well as different frequency components of the incident light. This work shows that transition Metal Nitrides can be successfully integrated into efficient metasurface building blocks for planar, rugged optical devices
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plasmonics on the slope of enlightenment the role of transition Metal Nitrides
2015Co-Authors: Urcan Guler, Alexandra Boltasseva, Alexander V Kildishev, Vladimir M. ShalaevAbstract:The key problem currently faced by plasmonics is related to material limitations. After almost two decades of extreme excitement and research largely based on the use of noble Metals, scientists have come to a consensus on the importance of exploring alternative plasmonic materials to address application-specific challenges to enable the development of new functional devices. Such a change in motivation will undoubtedly lead to significant advancements in plasmonics technology transfer and could have a revolutionary impact on nanophotonic technologies in general. Here, we report on one of the approaches that, together with other new material platforms, mark an insightful technology-driven era for plasmonics. Our study focuses on transition Metal Nitrides as refractory plasmonic materials that exhibit appealing optical properties in the visible and near infrared regions, along with high temperature durability. We take heat-assisted magnetic recording as a case study for plasmonic technology and show that a titanium nitride antenna satisfies the requirements for an optically efficient, durable near field transducer paving the way to the next-generation data recording systems.
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nanoparticle plasmonics going practical with transition Metal Nitrides
2015Co-Authors: Urcan Guler, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Promising designs and experimental realizations of devices with unusual properties in the field of plasmonics have attracted a great deal of attention over the past few decades. However, the high expectations for realized technology products have not been met so far. The main complication is the absence of robust, high performance, low cost plasmonic materials that can be easily integrated into already established technologies such as microelectronics. This review provides a brief discussion on alternative plasmonic materials for localized surface plasmon applications and focuses on transition Metal Nitrides, in particular, titanium nitride, which has recently been shown to be a high performance refractory plasmonic material that could replace and even outperform gold in various plasmonic devices. As a material compatible with biological environments and the semiconductor industry, titanium nitride possesses superior properties compared to noble Metals such as high temperature durability, chemical stability, corrosion resistance, low cost and mechanical hardness.
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plasmonic Metal Nitrides for thin film silicon solar cells
2013Co-Authors: Clayton Devault, Urcan Guler, Vladimir M. Shalaev, Alexandra Boltasseva, Alexander V KildishevAbstract:We numerically investigate electromagnetic interactions with Metal nitride nanoparticles and discuss potential applications for thin-film silicon solar cells. The results indicate strong local-field enhancement, particularly in the near infrared.
Levi T Thompson - One of the best experts on this subject based on the ideXlab platform.
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enhanced performance for early transition Metal Nitrides via pseudocapacitance in protic ionic liquid electrolytes
2017Co-Authors: Abdoulaye Djire, Jean Yves Ishimwe, Saemin Choi, Levi T ThompsonAbstract:Abstract Early transition Metal Nitrides achieve high capacitances via a pseudocapacitive mechanism that involves redox reactions with protons at their surfaces. Typically aqueous electrolytes are the source of protons, therefore the operating voltages are limited to ~ 1.2 V. Protic ionic liquid (PIL) based electrolytes offer the possibility of significantly higher operating voltages and energy densities. This paper describes the behavior of VN and TiN in a PIL consisting of 2-methylpyridine and trifluoroacetic acid. These Nitrides can be cycled up to 2.0 V in this electrolyte. Voltammograms for VN and TiN in the PIL and aqueous electrolytes were similar suggesting similar pseudocapacitive mechanisms. The use of PIL electrolytes instead of aqueous electrolytes could significantly increase the energies of nitride-based supercapacitors without significant losses in power.
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charge storage on nanostructured early transition Metal Nitrides and carbides
2012Co-Authors: Priyanka Pande, Paul G Rasmussen, Levi T ThompsonAbstract:Abstract Phase pure, nanostructured V, Mo and W Nitrides and carbides were synthesized and characterized in aqueous KOH and H 2 SO 4 electrolytes. Capacitances for most of the materials exceeded that expected for double layer charging and suggested a pseudocapacitive storage mechanism. With the exception of β-Mo 2 C, the materials were stable in KOH and/or H 2 SO 4 electrolytes. Capacitances for VN in KOH and γ-Mo 2 N in H 2 SO 4 were the highest and exceeded 200 F g −1 . The charge-storage species were interrogated using an ion isolation method. The results provide unambiguous evidence that OH − was the principal charge storage species responsible for the pseudocapacitance demonstrated for VN in KOH while H + was the principal species for γ-Mo 2 N in H 2 SO 4 .
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catalytic properties of early transition Metal Nitrides and carbides n butane hydrogenolysis dehydrogenation and isomerization
1999Co-Authors: M K Neylon, S Choi, H Kwon, K E Curry, Levi T ThompsonAbstract:Abstract Phase-pure early transition Metal Nitrides and carbides were prepared via the temperature programmed reaction of Metal oxides with NH3 or a CH4/H2 mixture. The Nitrides and carbides were mostly mesoporous with surface areas up to 81 m2/g. Their gravimetric butane conversion rates were generally higher than those for a Pt–Sn/Al2O3 catalyst. Activities for the Nitrides and carbides ranged from 0.4×1012 to 10×1012 molecules/cm2 s at 723 K and decreased as follows: γ-Mo2N>W2C≈WC>β-W2N≈WC1−x>β-Mo2C>VN≈V8C7≫NbC≈Nb4N3.92. The Metal atom type had the most significant effect on the activity and selectivity. The Group VI Metal Nitrides and carbides were much more active than the Group V Metal compounds. In general, the Group VI Metal compounds catalyzed butane hydrogenolysis and dehydrogenation with similar selectivities while the vanadium compounds had dehydrogenation selectivities in excess of 98%. The β-W2N catalyst also catalyzed butane isomerization possibly as a consequence of the presence of oxygen on the surface. The effect of lattice structure was significant and obvious for the tungsten carbides where WC (hex) was almost twice as active as WC1−x (fcc) despite having similar C/W ratios. Nitrides and carbides of the same Metal and lattice structure had similar activities suggesting that the effect of the non-Metal atom type was small. We believe variations in the catalytic properties of the Nitrides and carbides were the result of differences between their electronic structures.
Vladimir M. Shalaev - One of the best experts on this subject based on the ideXlab platform.
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photonic spin hall effect in robust phase gradient metasurfaces utilizing transition Metal Nitrides
2019Co-Authors: Krishnakali Chaudhuri, Amr Shaltout, Deesha Shah, Urcan Guler, Aveek Dutta, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Robust and high-temperature stable (refractory) transition Metal Nitrides are an emerging class of nanophotonic materials aimed at durable, bio- and CMOS-compatible plasmonic and metasurface applications. In this work, we experimentally demonstrate titanium nitride- and zirconium nitride-based phase manipulating optical metasurfaces that exhibit a photonic spin Hall effect. In the developed all-nitride system, Metal Nitrides are combined with dielectric Nitrides such as aluminum nitride and silicon nitride to design a highly anisotropic, multilayer resonator geometry that supports gap plasmons and enables high power efficiency (∼40%) and broad bandwidth of operation in the near-infrared wavelength region. A one-dimensional phase gradient created by geometric rotations of the resonators leads to simultaneous, spatial separation of right and left circular polarization as well as different frequency components of the incident light. This work shows that transition Metal Nitrides can be successfully integrate...
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Photonic Spin Hall Effect in Robust Phase Gradient Metasurfaces Utilizing Transition Metal Nitrides
2018Co-Authors: Krishnakali Chaudhuri, Amr Shaltout, Deesha Shah, Urcan Guler, Aveek Dutta, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Robust and high-temperature stable (refractory) transition Metal Nitrides are an emerging class of nanophotonic materials aimed at durable, bio- and CMOS-compatible plasmonic and metasurface applications. In this work, we experimentally demonstrate titanium nitride- and zirconium nitride-based phase manipulating optical metasurfaces that exhibit a photonic spin Hall effect. In the developed all-nitride system, Metal Nitrides are combined with dielectric Nitrides such as aluminum nitride and silicon nitride to design a highly anisotropic, multilayer resonator geometry that supports gap plasmons and enables high power efficiency (∼40%) and broad bandwidth of operation in the near-infrared wavelength region. A one-dimensional phase gradient created by geometric rotations of the resonators leads to simultaneous, spatial separation of right and left circular polarization as well as different frequency components of the incident light. This work shows that transition Metal Nitrides can be successfully integrated into efficient metasurface building blocks for planar, rugged optical devices
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plasmonics on the slope of enlightenment the role of transition Metal Nitrides
2015Co-Authors: Urcan Guler, Alexandra Boltasseva, Alexander V Kildishev, Vladimir M. ShalaevAbstract:The key problem currently faced by plasmonics is related to material limitations. After almost two decades of extreme excitement and research largely based on the use of noble Metals, scientists have come to a consensus on the importance of exploring alternative plasmonic materials to address application-specific challenges to enable the development of new functional devices. Such a change in motivation will undoubtedly lead to significant advancements in plasmonics technology transfer and could have a revolutionary impact on nanophotonic technologies in general. Here, we report on one of the approaches that, together with other new material platforms, mark an insightful technology-driven era for plasmonics. Our study focuses on transition Metal Nitrides as refractory plasmonic materials that exhibit appealing optical properties in the visible and near infrared regions, along with high temperature durability. We take heat-assisted magnetic recording as a case study for plasmonic technology and show that a titanium nitride antenna satisfies the requirements for an optically efficient, durable near field transducer paving the way to the next-generation data recording systems.
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nanoparticle plasmonics going practical with transition Metal Nitrides
2015Co-Authors: Urcan Guler, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Promising designs and experimental realizations of devices with unusual properties in the field of plasmonics have attracted a great deal of attention over the past few decades. However, the high expectations for realized technology products have not been met so far. The main complication is the absence of robust, high performance, low cost plasmonic materials that can be easily integrated into already established technologies such as microelectronics. This review provides a brief discussion on alternative plasmonic materials for localized surface plasmon applications and focuses on transition Metal Nitrides, in particular, titanium nitride, which has recently been shown to be a high performance refractory plasmonic material that could replace and even outperform gold in various plasmonic devices. As a material compatible with biological environments and the semiconductor industry, titanium nitride possesses superior properties compared to noble Metals such as high temperature durability, chemical stability, corrosion resistance, low cost and mechanical hardness.
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plasmonic Metal Nitrides for thin film silicon solar cells
2013Co-Authors: Clayton Devault, Urcan Guler, Vladimir M. Shalaev, Alexandra Boltasseva, Alexander V KildishevAbstract:We numerically investigate electromagnetic interactions with Metal nitride nanoparticles and discuss potential applications for thin-film silicon solar cells. The results indicate strong local-field enhancement, particularly in the near infrared.
Urcan Guler - One of the best experts on this subject based on the ideXlab platform.
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photonic spin hall effect in robust phase gradient metasurfaces utilizing transition Metal Nitrides
2019Co-Authors: Krishnakali Chaudhuri, Amr Shaltout, Deesha Shah, Urcan Guler, Aveek Dutta, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Robust and high-temperature stable (refractory) transition Metal Nitrides are an emerging class of nanophotonic materials aimed at durable, bio- and CMOS-compatible plasmonic and metasurface applications. In this work, we experimentally demonstrate titanium nitride- and zirconium nitride-based phase manipulating optical metasurfaces that exhibit a photonic spin Hall effect. In the developed all-nitride system, Metal Nitrides are combined with dielectric Nitrides such as aluminum nitride and silicon nitride to design a highly anisotropic, multilayer resonator geometry that supports gap plasmons and enables high power efficiency (∼40%) and broad bandwidth of operation in the near-infrared wavelength region. A one-dimensional phase gradient created by geometric rotations of the resonators leads to simultaneous, spatial separation of right and left circular polarization as well as different frequency components of the incident light. This work shows that transition Metal Nitrides can be successfully integrate...
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Photonic Spin Hall Effect in Robust Phase Gradient Metasurfaces Utilizing Transition Metal Nitrides
2018Co-Authors: Krishnakali Chaudhuri, Amr Shaltout, Deesha Shah, Urcan Guler, Aveek Dutta, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Robust and high-temperature stable (refractory) transition Metal Nitrides are an emerging class of nanophotonic materials aimed at durable, bio- and CMOS-compatible plasmonic and metasurface applications. In this work, we experimentally demonstrate titanium nitride- and zirconium nitride-based phase manipulating optical metasurfaces that exhibit a photonic spin Hall effect. In the developed all-nitride system, Metal Nitrides are combined with dielectric Nitrides such as aluminum nitride and silicon nitride to design a highly anisotropic, multilayer resonator geometry that supports gap plasmons and enables high power efficiency (∼40%) and broad bandwidth of operation in the near-infrared wavelength region. A one-dimensional phase gradient created by geometric rotations of the resonators leads to simultaneous, spatial separation of right and left circular polarization as well as different frequency components of the incident light. This work shows that transition Metal Nitrides can be successfully integrated into efficient metasurface building blocks for planar, rugged optical devices
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plasmonics on the slope of enlightenment the role of transition Metal Nitrides
2015Co-Authors: Urcan Guler, Alexandra Boltasseva, Alexander V Kildishev, Vladimir M. ShalaevAbstract:The key problem currently faced by plasmonics is related to material limitations. After almost two decades of extreme excitement and research largely based on the use of noble Metals, scientists have come to a consensus on the importance of exploring alternative plasmonic materials to address application-specific challenges to enable the development of new functional devices. Such a change in motivation will undoubtedly lead to significant advancements in plasmonics technology transfer and could have a revolutionary impact on nanophotonic technologies in general. Here, we report on one of the approaches that, together with other new material platforms, mark an insightful technology-driven era for plasmonics. Our study focuses on transition Metal Nitrides as refractory plasmonic materials that exhibit appealing optical properties in the visible and near infrared regions, along with high temperature durability. We take heat-assisted magnetic recording as a case study for plasmonic technology and show that a titanium nitride antenna satisfies the requirements for an optically efficient, durable near field transducer paving the way to the next-generation data recording systems.
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nanoparticle plasmonics going practical with transition Metal Nitrides
2015Co-Authors: Urcan Guler, Vladimir M. Shalaev, Alexandra BoltassevaAbstract:Promising designs and experimental realizations of devices with unusual properties in the field of plasmonics have attracted a great deal of attention over the past few decades. However, the high expectations for realized technology products have not been met so far. The main complication is the absence of robust, high performance, low cost plasmonic materials that can be easily integrated into already established technologies such as microelectronics. This review provides a brief discussion on alternative plasmonic materials for localized surface plasmon applications and focuses on transition Metal Nitrides, in particular, titanium nitride, which has recently been shown to be a high performance refractory plasmonic material that could replace and even outperform gold in various plasmonic devices. As a material compatible with biological environments and the semiconductor industry, titanium nitride possesses superior properties compared to noble Metals such as high temperature durability, chemical stability, corrosion resistance, low cost and mechanical hardness.
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plasmonic Metal Nitrides for thin film silicon solar cells
2013Co-Authors: Clayton Devault, Urcan Guler, Vladimir M. Shalaev, Alexandra Boltasseva, Alexander V KildishevAbstract:We numerically investigate electromagnetic interactions with Metal nitride nanoparticles and discuss potential applications for thin-film silicon solar cells. The results indicate strong local-field enhancement, particularly in the near infrared.