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Author |
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 |
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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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RPLAB @ gujma @ |
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753 |
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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 |
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Pages |
93-98 |
Keywords |
THz applications |
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485 |
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Author |
Betz, A. L.; Boreiko, R. T.; Sivananthan, S.; Ashokan, R. |
Title |
HgCdTe photoconductive mixers for 2-8 THz |
Type |
Conference Article |
Year |
2001 |
Publication |
Proc. 12th Int. Symp. Space Terahertz Technol. |
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Pages |
92-101 |
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San Diego, CA, USA |
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Jet Propulsion Laboratory, California Inst.it.u.t.e of Technology |
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RPLAB @ s @ HgCdTe_2p5hf_to_k_at_10um |
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321 |
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Author |
Boreman, Glenn D. |
Title |
A Users guide to IR detectors |
Type |
Conference Article |
Year |
2001 |
Publication |
Proc. SPIE |
Abbreviated Journal |
Proc. SPIE |
Volume |
4420 |
Issue |
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Pages |
79-90 |
Keywords |
optical antennas |
Abstract |
This paper will guide the first-time user toward proper selection and use of IR detectors for applications in industrial inspection, process control, and laser measurements. |
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RPLAB @ gujma @ |
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735 |
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Yagoubov, P.; Hübers, H.-W.; Gol’tsman, G.; Semenov, A.; Gao, J.; Hoogeveen, R.; de Graauw, T.; Birk, M.; Selig, A.; de Korte, P. |
Title |
Hot-electron bolometer mixers – technology for far-infrared heterodyne instruments in future atmospheric chemistry missions |
Type |
Conference Article |
Year |
2001 |
Publication |
Proc. 3rd Int. Symp. Submillimeter Wave Earth Observation From Space |
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Proc. 3rd Int. Symp. Submillimeter Wave Earth Observation From Space |
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Issue |
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Pages |
57-69 |
Keywords |
HEB mixers |
Abstract |
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Address |
Delmenhorst |
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Logos-Verlag |
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Buehler, S.; Berlin |
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3-89722-700-2 |
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International Symposium on Submillimeter Wave Earth Observation from Space, ISSMWEOS01 |
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1549 |
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Merkel, H. F.; Khosropanah, P.; Sigfrid Yngvesson, K.; Cherednichenko, S.; Kroug, M.; Adam, A.; Kollberg, E. |
Title |
An active zone small signal model for hot-electron bolometric mixers |
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Conference Article |
Year |
2001 |
Publication |
Proc. 12th Int. Symp. Space Terahertz Technol. |
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55 |
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San Diego, CA, USA |
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RPLAB @ s @ losses_in_contacts_merkel |
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320 |
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Author |
Mel’nikov, A. P.; Gurvich, Y. A.; Shestakov, L. N.; Gershenzon, E. M. |
Title |
Magnetic field effects on the nonohmic impurity conduction of uncompensated crystalline silicon |
Type |
Journal Article |
Year |
2001 |
Publication |
Jetp Lett. |
Abbreviated Journal |
Jetp Lett. |
Volume |
73 |
Issue |
1 |
Pages |
44-47 |
Keywords |
uncompensated crystalline silicon, nonohmic impurity conduction, magnetic field |
Abstract |
The impurity conduction of a series of crystalline silicon samples with the concentration of major impurity N ≈ 3 × 1016 cm−3 and with a varied, but very small, compensation K was measured as a function of the electric field E in various magnetic fields H-σ(H, E). It was found that, at K < 10−3 and in moderate E, where these samples are characterized by a negative nonohmicity (dσ(0, E)/dE < 0), the ratio σ(H, E)/σ(0, E) > 1 (negative magnetoresistance). With increasing E, these inequalities are simultaneously reversed (positive nonohmicity and positive magnetoresistance). It is suggested that both negative and positive nonohmicities are due to electron transitions in electric fields from impurity ground states to states in the Mott-Hubbard gap. |
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0021-3640 |
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1752 |
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Hübers, H.-W.; Schubert, J.; Krabbe, A.; Birk, M.; Wagner, G.; Semenov, A.; Gol’tsman, G.; Voronov, B.; Gershenzon, E. |
Title |
Parylene anti-reflection coating of a quasi-optical hot-electron-bolometric mixer at terahertz frequencies |
Type |
Journal Article |
Year |
2001 |
Publication |
Infrared Physics & Technology |
Abbreviated Journal |
Infrared Physics & Technology |
Volume |
42 |
Issue |
1 |
Pages |
41-47 |
Keywords |
NbN HEB mixers, anti-reflection coating |
Abstract |
Parylene C was investigated as anti-reflection coating for silicon at terahertz frequencies. Measurements with a Fourier-transform spectrometer show that the transmittance of pure silicon can be improved by about 30% when applying a layer of Parylene C with a quarter wavelength optical thickness. The 10% bandwidth of this coating extends from 1.5 to 3 THz for a center frequency of 2.3–2.5 THz, where the transmittance is constant. Heterodyne measurements demonstrate that the noise temperature of a hot-electron-bolometric mixer can be reduced significantly by coating the silicon lens of the hybrid antenna with a quarter wavelength Parylene C layer. Compared to the same mixer with an uncoated lens the improvement is about 30% at a frequency of 2.5 THz. |
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1350-4495 |
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1548 |
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Karpov, A.; Miller, D.; Rice, F.; Zmuidzinas, J.; Stern, J. A.; Bumble, B.; LeDuc, H. G. |
Title |
Low noise 1.2 THz SIS receiver |
Type |
Conference Article |
Year |
2001 |
Publication |
Proc. 12th Int. Symp. Space Terahertz Technol. |
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21-22 |
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San Diego, CA, USA |
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Jet Propulsion Laboratory, California Inst.it.u.t.e of Technology |
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RPLAB @ s @ sis_650K_at_1p13THz |
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316 |
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Author |
Verevkin, A.; Williams, C.; Gol’tsman, G. N.; Sobolewski, R.; Gilbert, G. |
Title |
Single-photon superconducting detectors for practical high-speed quantum cryptography |
Type |
Miscellaneous |
Year |
2001 |
Publication |
OFCC/ICQI |
Abbreviated Journal |
OFCC/ICQI |
Volume |
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Pages |
Pa3 |
Keywords |
NbN SSPD, SNSPD, QKD, quantum cryptography |
Abstract |
We have developed an ultrafast superconducting single-photon detector with negligible dark counting rate. The detector is based on an ultrathin, submicron-wide NbN meander-type stripe and can detect individual photons in the visible to near-infrared wavelength range at a rate of at least 10 Gb/s. The above counting rate allows us to implement the NbN device to unconditionally secret quantum key distRochester, New Yorkribution in a practical, high-speed system using real-time Vernam enciphering. |
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Rochester, New York |
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Optical Society of America |
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Optical Fiber Communication Conference and International Conference on Quantum Information |
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-- from poster session. |
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1544 |
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