The Experts below are selected from a list of 7692 Experts worldwide ranked by ideXlab platform
Ozdal Boyraz - One of the best experts on this subject based on the ideXlab platform.
-
electrical signal to noise ratio improvement in Indirect Detection of mid ir signals by wavelength conversion in silicon on sapphire waveguides
Applied Physics Letters, 2011Co-Authors: Yuewang Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, D Yildirim, F Qian, Qi Song, Ozdal BoyrazAbstract:Planar waveguide devices based on silicon-on-sapphire are emerging as a bridge between mid-infrared (IR) and near-IR wavelength through frequency conversion process. We analyze the limits of Indirect Detection of mid-IR signals by wavelength conversion in such waveguides and investigate signal-to-noise ratio improvement that is attainable with respect to direct Detection using state of the art commercial detectors. Our calculation shows that, in addition to room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 40 dB compared to direct Detection by PbSe, HgCdTe, and InSb detectors, especially in Detection of weak mid-IR signals.
-
eSNR Improvement in Indirect Detection of mid-IR Signals by Wavelength Conversion in SOS Waveguides
Proceedings of SPIE, 2011Co-Authors: Y Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, D Yildirim, F Qian, Qi Song, Ozdal BoyrazAbstract:With a transparency window up to 6 μm, sapphire can serve as a platform to support silicon photonic integrated circuit in MWIR. Planar waveguide devices based on silicon-on-sapphire (SOS) are emerging as a bridge between MWIR and SWIR through frequency band conversion process. While these devices are widely proposed to amplify MWIR signals and generate MWIR source, it can also be inversely utilized to achieve MWIR light Detection. Here MWIR signals are down-converted to telecommunication wavelength (1.55 μm) through SOS waveguides and Indirectly detected by SWIR detectors. Since detectors at telecommunication wavelengths exhibit superior performances in terms of speed, noise and sensitivity, the Indirect Detection scheme can be a promising candidate to improve the Detection performance. In this report, we analyze performance of the Indirect Detection of MWIR signals by wavelength conversion in SOS waveguides. Particularly we modeled and compared the noise performance of the Indirect Detection with direct Detection using state-of-the-art MWIR detectors. We show that, in addition to advantages of room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 50dB, 23dB and 4dB compared to direct Detection by PbSe, HgCdTe and InSb detectors respectively. The improvement is more pronounced in Detection of weak MWIR signals.
-
Electrical signal-to-noise ratio improvement in Indirect Detection of mid-IR signals by wavelength conversion in silicon-on-sapphire waveguides
Applied Physics Letters, 2011Co-Authors: Y Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, S. Gao, D Yildirim, F Qian, Qiang Song, Ozdal BoyrazAbstract:Planar waveguide devices based on silicon-on-sapphire are emerging as a bridge between mid-infrared (IR) and near-IR wavelength through frequency conversion process. We analyze the limits of Indirect Detection of mid-IR signals by wavelength conversion in such waveguides and investigate signal-to-noise ratio improvement that is attainable with respect to direct Detection using state of the art commercial detectors. Our calculation shows that, in addition to room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 40 dB compared to direct Detection by PbSe, HgCdTe, and InSb detectors, especially in Detection of weak mid-IR signals. © 2011 American Institute of Physics.
Geoffrey Bodenhausen - One of the best experts on this subject based on the ideXlab platform.
-
Indirect Detection of nitrogen 14 in solid state nmr spectroscopy
ChemPhysChem, 2007Co-Authors: Simone Cavadini, Sasa Antonijevic, Adonis Lupulescu, Geoffrey BodenhausenAbstract:This thesis describes new methods for the Detection of 14N nuclei by solid-state nuclear magnetic resonance. So far, the low natural abundance (0.4 %) 15N isotope has been widely used to study nitrogen-containing samples because of its spin-1/2 nature. The limited use of the spin-1 isotope 14N (natural abundance 99.6 %) in NMR is due to its strong quadrupolar coupling constant, which leads to very broad spectra that are difficult to excite uniformly and equally difficult to detect, requiring broad receiver bandwidths. The new methods presented in this work result from two main projects covering the Indirect Detection of 14N via carbon and via protons. The Indirect Detection of 14N can be achieved by heteronuclear multiple- or single-quantum correlation (HMQC or HSQC) experiments, which rely on the transfer of coherence from a neighboring spin S = 1/2 (13C or 1H) to single- (SQ) or double-quantum (DQ) transitions of 14N nuclei. These methods allow one to observe 14N powder patterns with enhanced sensitivity. These spectra depend on the quadrupolar coupling constant CQ (typically a few MHz), the asymmetry parameter ηQ, and on the orientation of the internuclear vector rIS between the I (14N) and S (13C or 1H) nuclei with respect to the quadrupolar tensor. These parameters reveal valuable information about the structure and dynamics of nitrogen-containing solids. The Indirect Detection methods are discussed in detail, covering the optimization of experimental parameters; subsequently, applications to the study of amino acids at different magnetic fields are demonstrated.
-
Indirect Detection of nitrogen-14 in solid-state NMR spectroscopy.
Chemphyschem : a European journal of chemical physics and physical chemistry, 2007Co-Authors: Simone Cavadini, Sasa Antonijevic, Adonis Lupulescu, Geoffrey BodenhausenAbstract:NMR spectra of (14)N (spin I=1) are obtained by Indirect Detection in powders spinning at the magic angle. The method relies on the transfer of coherence from a neighboring "spy" nucleus with S=1/2, such as (13)C or (1)H, to single- or double-quantum transitions of (14)N nuclei. The transfer of coherence can occur through a combination of scalar and residual dipolar splittings (RDS); the latter are also known as second-order quadrupole-dipole cross terms. The two-dimensional NMR spectra reveal powder patterns determined by second- and third-order quadrupolar couplings. These spectra depend on the quadrupolar coupling constant C(Q) (typically a few megahertz), on the asymmetry parameter eta(Q) of the (14)N nucleus, and on the orientation of the internuclear vector r(IS) between the I ((14)N) and S (spy) nuclei with respect to the quadrupolar tensor. These parameters, which can be subject to motional averaging, can reveal valuable information about the structure and dynamics of nitrogen-containing solids. Application of this technique to various amino acids, either enriched in (13)C or with natural carbon isotope abundance, with spectra recorded at various magnetic fields, illustrates the scope of the method.
E. K. Tien - One of the best experts on this subject based on the ideXlab platform.
-
electrical signal to noise ratio improvement in Indirect Detection of mid ir signals by wavelength conversion in silicon on sapphire waveguides
Applied Physics Letters, 2011Co-Authors: Yuewang Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, D Yildirim, F Qian, Qi Song, Ozdal BoyrazAbstract:Planar waveguide devices based on silicon-on-sapphire are emerging as a bridge between mid-infrared (IR) and near-IR wavelength through frequency conversion process. We analyze the limits of Indirect Detection of mid-IR signals by wavelength conversion in such waveguides and investigate signal-to-noise ratio improvement that is attainable with respect to direct Detection using state of the art commercial detectors. Our calculation shows that, in addition to room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 40 dB compared to direct Detection by PbSe, HgCdTe, and InSb detectors, especially in Detection of weak mid-IR signals.
-
eSNR Improvement in Indirect Detection of mid-IR Signals by Wavelength Conversion in SOS Waveguides
Proceedings of SPIE, 2011Co-Authors: Y Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, D Yildirim, F Qian, Qi Song, Ozdal BoyrazAbstract:With a transparency window up to 6 μm, sapphire can serve as a platform to support silicon photonic integrated circuit in MWIR. Planar waveguide devices based on silicon-on-sapphire (SOS) are emerging as a bridge between MWIR and SWIR through frequency band conversion process. While these devices are widely proposed to amplify MWIR signals and generate MWIR source, it can also be inversely utilized to achieve MWIR light Detection. Here MWIR signals are down-converted to telecommunication wavelength (1.55 μm) through SOS waveguides and Indirectly detected by SWIR detectors. Since detectors at telecommunication wavelengths exhibit superior performances in terms of speed, noise and sensitivity, the Indirect Detection scheme can be a promising candidate to improve the Detection performance. In this report, we analyze performance of the Indirect Detection of MWIR signals by wavelength conversion in SOS waveguides. Particularly we modeled and compared the noise performance of the Indirect Detection with direct Detection using state-of-the-art MWIR detectors. We show that, in addition to advantages of room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 50dB, 23dB and 4dB compared to direct Detection by PbSe, HgCdTe and InSb detectors respectively. The improvement is more pronounced in Detection of weak MWIR signals.
-
Electrical signal-to-noise ratio improvement in Indirect Detection of mid-IR signals by wavelength conversion in silicon-on-sapphire waveguides
Applied Physics Letters, 2011Co-Authors: Y Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, S. Gao, D Yildirim, F Qian, Qiang Song, Ozdal BoyrazAbstract:Planar waveguide devices based on silicon-on-sapphire are emerging as a bridge between mid-infrared (IR) and near-IR wavelength through frequency conversion process. We analyze the limits of Indirect Detection of mid-IR signals by wavelength conversion in such waveguides and investigate signal-to-noise ratio improvement that is attainable with respect to direct Detection using state of the art commercial detectors. Our calculation shows that, in addition to room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 40 dB compared to direct Detection by PbSe, HgCdTe, and InSb detectors, especially in Detection of weak mid-IR signals. © 2011 American Institute of Physics.
S. K. Kalyoncu - One of the best experts on this subject based on the ideXlab platform.
-
electrical signal to noise ratio improvement in Indirect Detection of mid ir signals by wavelength conversion in silicon on sapphire waveguides
Applied Physics Letters, 2011Co-Authors: Yuewang Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, D Yildirim, F Qian, Qi Song, Ozdal BoyrazAbstract:Planar waveguide devices based on silicon-on-sapphire are emerging as a bridge between mid-infrared (IR) and near-IR wavelength through frequency conversion process. We analyze the limits of Indirect Detection of mid-IR signals by wavelength conversion in such waveguides and investigate signal-to-noise ratio improvement that is attainable with respect to direct Detection using state of the art commercial detectors. Our calculation shows that, in addition to room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 40 dB compared to direct Detection by PbSe, HgCdTe, and InSb detectors, especially in Detection of weak mid-IR signals.
-
eSNR Improvement in Indirect Detection of mid-IR Signals by Wavelength Conversion in SOS Waveguides
Proceedings of SPIE, 2011Co-Authors: Y Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, D Yildirim, F Qian, Qi Song, Ozdal BoyrazAbstract:With a transparency window up to 6 μm, sapphire can serve as a platform to support silicon photonic integrated circuit in MWIR. Planar waveguide devices based on silicon-on-sapphire (SOS) are emerging as a bridge between MWIR and SWIR through frequency band conversion process. While these devices are widely proposed to amplify MWIR signals and generate MWIR source, it can also be inversely utilized to achieve MWIR light Detection. Here MWIR signals are down-converted to telecommunication wavelength (1.55 μm) through SOS waveguides and Indirectly detected by SWIR detectors. Since detectors at telecommunication wavelengths exhibit superior performances in terms of speed, noise and sensitivity, the Indirect Detection scheme can be a promising candidate to improve the Detection performance. In this report, we analyze performance of the Indirect Detection of MWIR signals by wavelength conversion in SOS waveguides. Particularly we modeled and compared the noise performance of the Indirect Detection with direct Detection using state-of-the-art MWIR detectors. We show that, in addition to advantages of room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 50dB, 23dB and 4dB compared to direct Detection by PbSe, HgCdTe and InSb detectors respectively. The improvement is more pronounced in Detection of weak MWIR signals.
-
Electrical signal-to-noise ratio improvement in Indirect Detection of mid-IR signals by wavelength conversion in silicon-on-sapphire waveguides
Applied Physics Letters, 2011Co-Authors: Y Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, S. Gao, D Yildirim, F Qian, Qiang Song, Ozdal BoyrazAbstract:Planar waveguide devices based on silicon-on-sapphire are emerging as a bridge between mid-infrared (IR) and near-IR wavelength through frequency conversion process. We analyze the limits of Indirect Detection of mid-IR signals by wavelength conversion in such waveguides and investigate signal-to-noise ratio improvement that is attainable with respect to direct Detection using state of the art commercial detectors. Our calculation shows that, in addition to room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 40 dB compared to direct Detection by PbSe, HgCdTe, and InSb detectors, especially in Detection of weak mid-IR signals. © 2011 American Institute of Physics.
E. Adas - One of the best experts on this subject based on the ideXlab platform.
-
electrical signal to noise ratio improvement in Indirect Detection of mid ir signals by wavelength conversion in silicon on sapphire waveguides
Applied Physics Letters, 2011Co-Authors: Yuewang Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, D Yildirim, F Qian, Qi Song, Ozdal BoyrazAbstract:Planar waveguide devices based on silicon-on-sapphire are emerging as a bridge between mid-infrared (IR) and near-IR wavelength through frequency conversion process. We analyze the limits of Indirect Detection of mid-IR signals by wavelength conversion in such waveguides and investigate signal-to-noise ratio improvement that is attainable with respect to direct Detection using state of the art commercial detectors. Our calculation shows that, in addition to room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 40 dB compared to direct Detection by PbSe, HgCdTe, and InSb detectors, especially in Detection of weak mid-IR signals.
-
eSNR Improvement in Indirect Detection of mid-IR Signals by Wavelength Conversion in SOS Waveguides
Proceedings of SPIE, 2011Co-Authors: Y Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, D Yildirim, F Qian, Qi Song, Ozdal BoyrazAbstract:With a transparency window up to 6 μm, sapphire can serve as a platform to support silicon photonic integrated circuit in MWIR. Planar waveguide devices based on silicon-on-sapphire (SOS) are emerging as a bridge between MWIR and SWIR through frequency band conversion process. While these devices are widely proposed to amplify MWIR signals and generate MWIR source, it can also be inversely utilized to achieve MWIR light Detection. Here MWIR signals are down-converted to telecommunication wavelength (1.55 μm) through SOS waveguides and Indirectly detected by SWIR detectors. Since detectors at telecommunication wavelengths exhibit superior performances in terms of speed, noise and sensitivity, the Indirect Detection scheme can be a promising candidate to improve the Detection performance. In this report, we analyze performance of the Indirect Detection of MWIR signals by wavelength conversion in SOS waveguides. Particularly we modeled and compared the noise performance of the Indirect Detection with direct Detection using state-of-the-art MWIR detectors. We show that, in addition to advantages of room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 50dB, 23dB and 4dB compared to direct Detection by PbSe, HgCdTe and InSb detectors respectively. The improvement is more pronounced in Detection of weak MWIR signals.
-
Electrical signal-to-noise ratio improvement in Indirect Detection of mid-IR signals by wavelength conversion in silicon-on-sapphire waveguides
Applied Physics Letters, 2011Co-Authors: Y Huang, E. K. Tien, S. K. Kalyoncu, E. Adas, S. Gao, D Yildirim, F Qian, Qiang Song, Ozdal BoyrazAbstract:Planar waveguide devices based on silicon-on-sapphire are emerging as a bridge between mid-infrared (IR) and near-IR wavelength through frequency conversion process. We analyze the limits of Indirect Detection of mid-IR signals by wavelength conversion in such waveguides and investigate signal-to-noise ratio improvement that is attainable with respect to direct Detection using state of the art commercial detectors. Our calculation shows that, in addition to room temperature and high speed operation, the proposed Indirect Detection can improve the electrical signal-to-noise ratio up to 40 dB compared to direct Detection by PbSe, HgCdTe, and InSb detectors, especially in Detection of weak mid-IR signals. © 2011 American Institute of Physics.