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Ciulin, V.; Carter, S. G.; Sherwin, M. S. |
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Title |
Terahertz optical mixing in biased GaAs single quantum wells |
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Journal Article |
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2004 |
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Phys. Rev. B |
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Phys. Rev. B |
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70 |
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11 |
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115312-(1-6) |
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optical mixing |
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1098-0121 |
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501 |
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Bingham, S. J.; Börger, B.; Suter, D.; Thomson, A. J. |
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Title |
The design and sensitivity of microwave frequency optical heterodyne receivers |
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Journal Article |
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1998 |
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Review of Scientific Instruments |
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Rev. Sci. Instrum. |
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69 |
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9 |
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3403-3409 |
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optical mixing |
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0034-6748 |
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508 |
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Tonguz, O.K.; Hwang, B. |
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Title |
Noise performance of AFC loops in optical heterodyne receivers |
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Conference Article |
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1993 |
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Proc. Lasers and Electro-Optics Society Annual Meeting |
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Proc. LEOS |
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361-362 |
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San Jose, CA, USA |
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Author |
Genack, Azriel Z.; Kopp, Victor I.; Churikov, Victor M.; Singer, Jonathan; Chao, Norman; Neugroschl, Daniel A. |
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Title |
Chiral fiber Bragg gratings |
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Conference Article |
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2004 |
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Proceedings of the SPIE |
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Proc. SPIE |
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5508 |
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57-64 |
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optical fiber gratings, chiral fiber gratings, chiral gratings, from chiralphotonics |
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We have produced chiral fiber Bragg gratings with double-helix symmetry and measured the polarization and wavelength selective transmission properties of these structures. These gratings interact only with circularly polarized light with the same handedness as the grating twist and freely transmit light of the orthogonal polarization. The optical characteristics of chiral fibers are compared to those of planar cholesteric structures. The resonant standing wave at the band edge or at a defect state within the band gap, as well as the evanescent wave within the band gap is comprised of two counterpropagating components of equal amplitude. The electric field vector of such a circularly polarized standing wave does not rotate in time; rather it is linearly polarized in any given plane. The standing wave may be described in terms of the sense of circular polarization of the two counterpropagating components. The wavelength dependence of the angle q between the linearly polarized electromagnetic field and the extraordinary axis, which is constant throughout a long structure, is obtained in a simple calculation. The results are in good agreement with scattering matrix calculations. Resonant chiral gratings are demonstrated for microwave radiation whereas chiral gratings with pitch exceeding the wavelength are demonstrated at optical wavelengths in single-mode glass fibers. The different functionalities of these fibers are discussed. |
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Kopp, Victor I.; Churikov, Victor M.; Zhang, Guoyin; Singer, Jonathan; Draper, Christopher W.; Chao, Norman; Neugroschl, Daniel; Genack, Azriel Z. |
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Title |
Chiral fiber gratings: perspectives and challenges for sensing applications |
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Conference Article |
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2007 |
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Proceedings of Third european workshop on optical fibre sensors |
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Proc. 3rd European Workshop on Opt. Fibre Sensors |
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6619 |
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66190B-(1-8) |
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optical fiber gratings, chiral fiber gratings applications, chiral gratings applications, from chiralphotonics |
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Chiral fiber gratings are produced in a microforming process in which optical fibers with noncircular or nonconcentric cores are twisted as they pass though a miniature oven. Periodic glass structures as stable as the glass material itself are produced with helical pitch that ranges from under a micron to hundreds of microns. The geometry of the fiber cross section determines the symmetry of the resulting structure which in turn determines its polarization selectivity. Single helix structures are polarization insensitive while double helix gratings interact only with a single optical polarization. Both single and double helix gratings may act as a fiber long period grating, coupling the core and cladding modes. The coupling is manifested in a series of narrow dips in the transmission spectrum. The dip position is sensitive to fiber elongation, twist and temperature, and to the refractive index of the surrounding medium. The suitability of chiral gratings for sensing pressure, temperature and liquid levels is investigated. Polarization insensitive single helix silica glass gratings display excellent stability up to temperatures of 6000C, while a pressure sensor with dynamic range of nearly 40 dB is demonstrated in polarization selective double helix gratings. |
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