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Skalare, A.; McGrath, William R.; Echternach, P. M.; Leduc, H. G.; Siddiqi, I.; Verevkin, A.; Prober, D. E. |
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Title |
Aluminum hot-electron bolometer mixers at submillimeter wavelengths |
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Journal Article |
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Year |
2001 |
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IEEE Trans. Appl. Supercond. |
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Volume |
11 |
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1 |
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641-644 |
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Al HEB mixer, contacts, interface, in situ, in-situ, Aluminium HEB mixer |
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Abstract |
Diffusion-cooled aluminum hot-electron bolometer (HEB) mixers are of interest for low-noise high resolution THz-frequency spectroscopy within astrophysics. Al HEB mixers offer operation with an order of magnitude less local oscillator power, higher intermediate frequency bandwidth and potentially lower noise than competing devices made from other materials. We report on mixer experiments at 618 GHz with devices fabricated from films with sheet resistances in the range from about 55 Ω down to about 9 Ω per square. Intermediate frequency bandwidths of up to 3 GHz were measured (1 μm long device), with absorbed local oscillator power levels of 0.5 to 6 nW and mixer conversion up to -21.5 dB. High input coupling efficiency implies that the electrons in the device are able to thermalize before escaping from the device. It was found that the long coherence length complicates mixer operations due to the proximity of the contact pads. Also, saturation at the IF frequency may be a concern for this type of device, and warrants further studies. |
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1051-8223 |
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no |
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ref919426b |
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1061 |
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Author |
Danny Wilms Floet |
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Title |
Hotspot mixing in THz niobium superconducting hot electron bolometer mixers |
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Manuscript |
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2001 |
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Delft University of Technology |
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Ph.D. thesis |
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Netherlands |
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932 |
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ГОСТ Р 15.201-2000. Продукция производственно-технического назначения. Порядок разработки и постановки продукции на производство |
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2001 |
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876 |
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ГОСТ 19.301-2000. ЕСКД. Программа и методика испытаний. Требования к содержанию, оформлению и контролю качества |
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2001 |
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866 |
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ГОСТ 2.102-68. ЕСКД. Виды и комплектность конструкторских документов |
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2001 |
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gost, detproj |
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861 |
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Puscasu, Irina; Boreman, Glenn D. |
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Title |
Theoretical and experimental analysis of transmission and enchanced absorption of frequency selective surfaces in the infrared |
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Conference Article |
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Year |
2001 |
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Proc. SPIE |
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Proc. SPIE |
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4293 |
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185-190 |
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Keywords |
optical antennas |
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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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no |
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RPLAB @ gujma @ |
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753 |
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Author |
Codreanu, Iulian; Boreman, Glenn D. |
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Title |
Infrared microstrip dipole antennas |
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Journal Article |
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Year |
2001 |
Publication |
Microwave and Optical Technology Letters |
Abbreviated Journal |
Microw Opt Technol Lett |
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29 |
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6 |
Pages |
381-383 |
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Keywords |
optical antennas |
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Abstract 10.1002/mop.1184.abs We report on the successful use of niobium microbolometers coupled to microstrip dipole antennas for the detection of midinfrared radiation. Measurements of the detector response versus antenna length performed at the 10.6 μm wavelength allowed us to identify the first three current-wave resonances along the antenna arms. The detector response was also measured as a function of the radiation wavelength in the 911 μm spectral domain. Excellent agreement between the experimental results and finite-difference time-domain (FDTD) predictions was obtained. |
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no |
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RPLAB @ gujma @ |
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738 |
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Author |
Boreman, Glenn D. |
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Title |
A Users guide to IR detectors |
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Conference Article |
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Year |
2001 |
Publication |
Proc. SPIE |
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Proc. SPIE |
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4420 |
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79-90 |
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optical antennas |
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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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no |
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RPLAB @ gujma @ |
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735 |
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Kasparek, W; Fernandez, A.; Hollmann, F; Wacker, R. |
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Title |
Measurements of ohmic losses of metallic reflectors at 140 GHz using a 3-mirror resonator technique |
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2001 |
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Int. J. Infrared and Millimeter Waves |
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22 |
Issue |
11 |
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1695-1707 |
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mirror, reflection index, emissivity, Fabry-Perot interferometer, subterahertz, subTHz |
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Abstract |
The reflectivity of metallic mirrors in the millimeter wave region does not only depend on the material, but also on the structure and roughness of the surface. We have performed measurements of the reflectivity of various plane and grooved metallic and graphite samples at 140 GHz. The technique is based on the comparison of the quality factor of a 2-mirror reference resonator with the quality factor of a 3-mirror resonator which has identical dimensions and includes the mirror to be tested. After a brief presentation of the theory, the set-up is described and the reflection loss for various aluminium and copper mirrors as well as vacuum compatible materials for applications in thermonuclear fusion experiments are presented and discussed. |
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no |
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581 |
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Author |
Murk, A.; Kämpfer, N.; Wylde, R.; Inatani, J.; Manabe, T.; Seta, M. |
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Characterization of various quasi-optical components for the submillimeter limb-sounder SMILES |
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2001 |
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Proc. 12th Int. Symp. Space Terahertz Technol. |
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426-435 |
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limb-sounder |
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530 |
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Semenov, A.; Goltsman, G.; Korneev, A. |
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Title |
Quantum detection by current carrying superconducting film |
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2001 |
Publication |
Phys. C: Supercond. |
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Phys. C: Supercond. |
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351 |
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4 |
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349-356 |
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quantum detection, phase slip centers, quasiparticle diffusion |
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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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0921-4534 |
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507 |
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Zwiller, Vale<cc><81>ry; Blom, Hans; Jonsson, Per; Panev, Nikolay; Jeppesen, Sören; Tsegaye, Tedros; Goobar, Edgard; Pistol, Mats-Erik; Samuelson, Lars; Björk, Gunnar |
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Title |
Single quantum dots emit single photons at a time: Antibunching experiments |
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Journal Article |
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2001 |
Publication |
Applied Physics Letters |
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Appl. Phys. Lett. |
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78 |
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17 |
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2476 |
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antibunching, quantum dot |
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0003-6951 |
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502 |
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Shelkovnikov, A.; Grain, C.; Nguyen, C. T.; Butcher, R. J.; Amy-Klein, A.; Chardonnet, C. |
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500-Hz two-photon Ramsey fringes with a SF6 beam: towards a new frequency standard in the 30-THz spectral region |
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2001 |
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Applied Physics B: Lasers and Optics |
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Appl. Phys. B: Lasers and Optics |
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73 |
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93-98 |
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THz applications |
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485 |
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Van Rudd, J.; Johnson, Jon L.; Mittleman, Daniel M. |
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Cross-polarized angular emission patterns from lens-coupled terahertz antennas |
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2001 |
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J. Opt. Soc. Am. B |
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18 |
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10 |
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1524 |
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0740-3224 |
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475 |
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Eliasson, Blake J. |
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Metal-insulator-metal diodes for solar energy conversion |
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2001 |
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University of Colorado |
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MIM diodes |
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Ph.D. thesis |
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PhD thesis |
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