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Author (up) Puscasu, Irina; Boreman, Glenn D.
Title Theoretical and experimental analysis of transmission and enchanced absorption of frequency selective surfaces in the infrared Type Conference Article
Year 2001 Publication Proc. SPIE Abbreviated Journal Proc. SPIE
Volume 4293 Issue Pages 185-190
Keywords optical antennas
Abstract A comparative study between theory and experiment is presented for transmission through lossy frequency selective surfaces (FSSs) on silicon in the 2 – 15 micrometer range. Important parameters controlling the resonance shape and location are identified: dipole length, spacing, impedance, and dielectric surroundings. Their separate influence is exhibited. The primary resonance mechanism of FSSs is the resonance of the individual metallic patches. There is no discernable resonance arising from a feed-coupled configuration. The real part of the element's impedance controls the minimum value of transmission, while scarcely affecting its location. Varying the imaginary part shifts the location of resonance, while only slightly changing the minimum value of transmission. With such fine-tuning, it is possible to make a good fit between theory and experiment near the dipole resonance on any sample. A fixed choice of impedance can provide a reasonable fit to all samples fabricated under the same conditions. The dielectric surroundings change the resonance wavelength of the FSS compared to its value in air. The presence of FSS on the substrate increases the absorptivity/emissivity of the surface in a resonant way. Such enhancement is shown for dipole and cross arrays at several wavelengths.
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Call Number RPLAB @ gujma @ Serial 753
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Author (up) Semenov, A.; Goltsman, G.; Korneev, A.
Title Quantum detection by current carrying superconducting film Type Journal Article
Year 2001 Publication Phys. C: Supercond. Abbreviated Journal Phys. C: Supercond.
Volume 351 Issue 4 Pages 349-356
Keywords quantum detection, phase slip centers, quasiparticle diffusion
Abstract We describe a novel quantum detection mechanism in the superconducting film carrying supercurrent. The mechanism incorporates growing normal domain and breaking of superconductivity by the bias current. A single photon absorbed in the film creates transient normal spot that causes redistribution of the current and, consequently, increase of the current density in superconducting areas. When the current density exceeds the critical value, the film switches into resistive state and generates the voltage pulse. Analysis shows that a submicron-wide film of conventional low temperature superconductor operated in liquid helium may detect single far-infrared photon. The amplitude and duration of the voltage pulse are in the millivolt and picosecond range, respectively. The quantitative model is presented that allows simulation of the detector utilizing this detection mechanism.
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ISSN 0921-4534 ISBN Medium
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Call Number Serial 507
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Author (up) Shelkovnikov, A.; Grain, C.; Nguyen, C. T.; Butcher, R. J.; Amy-Klein, A.; Chardonnet, C.
Title 500-Hz two-photon Ramsey fringes with a SF6 beam: towards a new frequency standard in the 30-THz spectral region Type Journal Article
Year 2001 Publication Applied Physics B: Lasers and Optics Abbreviated Journal Appl. Phys. B: Lasers and Optics
Volume 73 Issue Pages 93-98
Keywords THz applications
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Call Number Serial 485
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Author (up) Shi, S. C.; Chin, C. C.; Wang, M. J.; Shan, W. L.; Zhang, W.; Noguchi, T.
Title Development of a 600–720 GHz SIS Mixer for the SMART Type Conference Article
Year 2001 Publication Proc. 12th Int. Symp. Space Terahertz Technol. Abbreviated Journal
Volume Issue Pages 215
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Publisher Place of Publication San Diego, CA, USA Editor Jet Propulsion Laboratory, California Inst.it.u.t.e of Technology
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Call Number RPLAB @ s @ sis_145K_at_p618THz Serial 317
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Author (up) Shitov, S. V.; Levitchev, M.; Veretennikov, A. V.; Koshelets, V. P.; Prokopenko, G. V.; Filippenko, L. V.; Ermakov, A. B.; Shtanyuk, A. M.; Kohlstedt, H.; Ustinov, A. V.
Title Superconducting integrated receiver as 400-600 GHz tester for coolable devices Type Journal Article
Year 2001 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal
Volume 11 Issue 1 Pages 832-835
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Call Number RPLAB @ s @ sis_Shitov_2001 Serial 313
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