The Experts below are selected from a list of 57921 Experts worldwide ranked by ideXlab platform
Marko Loncar - One of the best experts on this subject based on the ideXlab platform.
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high quality factor Photonic Crystal nanobeam cavities
Applied Physics Letters, 2009Co-Authors: Parag B Deotare, Murray W Mccutcheon, Ian W Frank, Mughees Khan, Marko LoncarAbstract:We investigate the design, fabrication, and experimental characterization of high quality factor Photonic Crystal nanobeam cavities in silicon. Using a five-hole tapered one-dimensional Photonic Crystal mirror and precise control of the cavity length, we designed cavities with theoretical quality factors as high as 1.4×107. By detecting the cross-polarized resonantly scattered light from a normally incident laser beam, we measure a quality factor of nearly 7.5×105. The effect of cavity size on mode frequency and quality factor was simulated and then verified experimentally.
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high quality factor Photonic Crystal nanobeam cavities
arXiv: Optics, 2009Co-Authors: Parag B Deotare, Murray W Mccutcheon, Ian W Frank, Mughees Khan, Marko LoncarAbstract:We investigate the design, fabrication and experimental characterization of high Quality factor Photonic Crystal nanobeam cavities in silicon. Using a five-hole tapered 1D Photonic Crystal mirror and precise control of the cavity length, we designed cavities with theoretical Quality factors as high as 14 million. By detecting the cross-polarized resonantly scattered light from a normally incident laser beam, we measure a Quality factor of nearly 750,000. The effect of cavity size on mode frequency and Quality factor was simulated and then verified experimentally.
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high frequency oscillation in Photonic Crystal nanolasers
Applied Physics Letters, 2004Co-Authors: Tomoyuki Yoshie, Marko Loncar, Axel Scherer, Yueming QiuAbstract:We observed modulated oscillations in lasers of up to 130 GHz by conducting frequency domain measurements on Photonic Crystal lasers with built-in saturable absorbers. This is an example of how the small volumes of Photonic Crystal lasers lead to increases in the internal modulation frequencies and enables dramatic improvements of the laser modulation rate.
Kent D Choquette - One of the best experts on this subject based on the ideXlab platform.
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Decimated Photonic Crystal Defect Cavity Lasers
2015Co-Authors: Antonios V. Giannopoulos, Student Member, Joshua D. Sulkin, Christopher M, James J. Coleman, Kent D ChoquetteAbstract:Abstract—We present the design, fabrication, and characteriza-tion of decimated lattice Photonic Crystal membrane lasers. Based on our simulated designs, decimated Photonic Crystal lattices have reduced number of holes, which enhance the current and heat con-ductive paths from the optical cavity with a minimal impact on the cavity quality factor and resonance. Our calculations indicate lower operating temperature using the decimation lattice designs. Two decimated cavity designs are demonstrated and compared to conventional Photonic Crystal defect cavity lasers in InP-based membranes. The decimated designs show improved laser perfor-mance with a small reduction of measured cavity quality factor. Reduction of the Photonic Crystal holes around the defect cav-ity to as few as two periods still enables photopumped operation of Photonic Crystal defect lasers. The improvement in the ther-mal properties is characterized by varying the photopumping duty cycle. Index Terms—Photonic bandgap materials, semiconductor lasers. I
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single mode Photonic Crystal vertical cavity lasers
Applied Physics Letters, 2006Co-Authors: Aaron J Danner, J J Raftery, Paul O Leisher, Kent D ChoquetteAbstract:We report the accuracy of the Photonic Crystal model in describing the characteristics of vertical cavity surface-emitting lasers with lateral optical confinement consisting of a periodic array of etched circular holes. Experiments were carried out to compare predictions of the Photonic Crystal model to observed modal device characteristics, and the oxide aperture size was optimized to give maximum output power and lower threshold. The role of loss in improving modal properties was also investigated. Optimized lasers exhibit submilliamp threshold current and operate in the fundamental lateral mode for all currents.
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transverse modes of Photonic Crystal vertical cavity lasers
Applied Physics Letters, 2004Co-Authors: Aaron J Danner, Noriyuki Yokouchi, J J Raftery, Kent D ChoquetteAbstract:The control of lateral mode operation using a Photonic Crystal in a vertical-cavity surface-emitting laser (VCSEL) is analyzed and confirmed experimentally. By controlling design parameters of the Photonic Crystal pattern, we have produced Photonic Crystal VCSELs that operate in higher order defect modes in addition to the fundamental defect mode. The transverse modal behavior is consistent with the predictions of a theoretical model in which the etching depth dependence of the air holes of the Photonic Crystals is considered. We also have determined the lower limit of optical confinement required from the Photonic Crystal pattern to influence the output beam of the laser.
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single mode Photonic Crystal vertical cavity lasers incorporating etch depth dependence
Conference on Lasers and Electro-Optics, 2003Co-Authors: Aaron J Danner, Noriyuki Yokouchi, Kent D ChoquetteAbstract:Triangular lattice Photonic Crystal designs incorporating the etch depth dependence on mode properties were created within vertical cavity lasers for the first time. Fabricated lasers show operation in the fundamental Photonic Crystal defect mode.
K. Staliunas - One of the best experts on this subject based on the ideXlab platform.
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Photonic Crystal spatial filtering in broad aperture diode laser
Applied Physics Letters, 2019Co-Authors: S Gawali, Darius Gailevičius, Vytautas Purlys, K. Staliunas, Jose Trull, Guillermo Garrewerner, C Cojocaru, Joan MontielponsodaAbstract:Broad aperture semiconductor lasers usually suffer from low spatial quality of the emitted beams. Due to the highly compact character of such lasers, the use of conventional intracavity spatial filters is problematic. We demonstrate that extremely compact Photonic Crystal spatial filters, incorporated into a laser resonator, can improve the beam spatial quality and, correspondingly, increase the brightness of the emitted radiation. We report the decrease in the M2 value from 47 down to 28 due to Photonic Crystal spatial intracavity filtering and the increase in the brightness by a factor of 1.5, giving a proof of principle of intracavity Photonic Crystal spatial filtering in broad area semiconductor lasers.
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Photonic Crystal microchip laser
Laser Resonators Microresonators and Beam Control XIX, 2017Co-Authors: Darius Gailevičius, Vytautas Purlys, V. Koliadenko, Martynas Peckus, V. B. Taranenko, K. StaliunasAbstract:The microchip lasers, being sources of coherent light, suffer from one serious drawback: low spatial quality of the beam, strongly reducing the brightness of emitted radiation. Attempts to improve the beam quality, such as pump-beam guiding, external feedback, either strongly reduce the emission power, or drastically increase the size and complexity of the lasers. Here we propose that specially designed Photonic Crystal in the cavity of a microchip laser, can significantly improve the beam quality. We experimentally show that a microchip laser, due to spatial filtering functionality of intracavity Photonic Crystal, improves the beam quality factor M2 reducing it by factor of 2, and thus increase the brightness of radiation by a factor of 4. This comprises a new kind of laser, the "Photonic Crystal microchip laser", a very compact and efficient light source emitting high spatial high brightness radiation.
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Photonic Crystal Microchip Laser.
Scientific reports, 2016Co-Authors: Darius Gailevičius, Vytautas Purlys, V. Koliadenko, Martynas Peckus, V. B. Taranenko, K. StaliunasAbstract:The microchip lasers, being very compact and efficient sources of coherent light, suffer from one serious drawback: low spatial quality of the beam strongly reducing the brightness of emitted radiation. Attempts to improve the beam quality, such as pump-beam guiding, external feedback, either strongly reduce the emission power, or drastically increase the size and complexity of the lasers. Here it is proposed that specially designed Photonic Crystal in the cavity of a microchip laser, can significantly improve the beam quality. Experiments show that a microchip laser, due to spatial filtering functionality of intracavity Photonic Crystal, improves the beam quality factor M2 reducing it by a factor of 2 and increase the brightness of radiation by a factor of 3. This comprises a new kind of laser, the “Photonic Crystal microchip laser”, a very compact and efficient light source emitting high spatial quality high brightness radiation.
Philip St. J. Russell - One of the best experts on this subject based on the ideXlab platform.
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Photonic Crystal fibres for chemical sensing and photochemistry
Chemical Society Reviews, 2013Co-Authors: Philip St. J. Russell, Ana M Cubillas, Sarah Unterkofler, T G Euser, Bastian J M Etzold, Anita C Jones, Peter J Sadler, Peter WasserscheidAbstract:In this review, we introduce Photonic Crystal fibre as a novel optofluidic microdevice that can be employed as both a versatile chemical sensor and a highly efficient microreactor. We demonstrate that it provides an excellent platform in which light and chemical samples can strongly interact for quantitative spectroscopic analysis or photoactivation purposes. The use of Photonic Crystal fibre in photochemistry and sensing is discussed and recent results on gas and liquid sensing as well as on photochemical and catalytic reactions are reviewed. These developments demonstrate that the tight light confinement, enhanced light-matter interaction and reduced sample volume offered by Photonic Crystal fibre make it useful in a wide range of chemical applications.
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Photonic Crystal fibers
Journal of Lightwave Technology, 2006Co-Authors: Philip St. J. RussellAbstract:The history, fabrication, theory, numerical modeling, optical properties, guidance mechanisms, and applications of Photonic-Crystal fibers are reviewed
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Photonic Crystal fibers.
Science (New York, N.Y.), 2003Co-Authors: P.st.j. Russell, Philip St J Russell, Philip St. J. RussellAbstract:Photonic Crystal fibers guide light by corralling it within a periodic array of microscopic air holes that run along the entire fiber length. Largely through their ability to overcome the limitations of conventional fiber optics-for example, by permitting low-loss guidance of light in a hollow core-these fibers are proving to have a multitude of important technological and scientific applications spanning many disciplines. The result has been a renaissance of interest in optical fibers and their uses.
Hong X Tang - One of the best experts on this subject based on the ideXlab platform.
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aluminum nitride piezo acousto Photonic Crystal nanocavity with high quality factors
Applied Physics Letters, 2013Co-Authors: Chi Xiong, Carsten Schuck, Hong X TangAbstract:We develop a piezoelectrically actuated, one-dimensional acoustic and Photonic Crystal nanocavity fabricated from aluminum nitride (AlN). Through simultaneous band structure engineering in both Photonic and acoustic domains, we obtain high-quality piezo-acousto-Photonic Crystal nanocavities with intrinsic optical Q of 1.2 × 105. The piezoelectric actuation of the confined mechanical mode at 3.18 GHz is demonstrated with mechanical Q exceeding 10 000. Such piezo-acousto-Photonic Crystal nanocavities will find important applications in cavity optomechanics that desire effective coupling to the electrical degree of freedom.
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high q aluminum nitride Photonic Crystal nanobeam cavities
Applied Physics Letters, 2012Co-Authors: Wolfram H P Pernice, Chi Xiong, Carsten Schuck, Hong X TangAbstract:We demonstrate high optical quality factors in aluminum nitride (AlN) Photonic Crystal nanobeam cavities. Suspended AlN Photonic Crystal nanobeams are fabricated in sputter-deposited AlN-on-insulator substrates using a self-protecting release process. Employing one-dimensional Photonic Crystal cavities coupled to integrated optical circuits, we measure quality factors up to 146 000. By varying the waveguide-cavity coupling gap, extinction ratios in excess of 15 dB are obtained. Our results open the door for integrated Photonic bandgap structures made from a low loss, wide-transparency, nonlinear optical material system.
