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| Author | Khosropanah, Pourya | ||||
| Title | NbN and NbTiN hot electron bolometer THz mixers | Type | Book Whole | ||
| Year | 2003 | Publication | Chalmers University of Technology | Abbreviated Journal | |
| Volume | Issue | Pages | |||
| Keywords | HEB mixer, hot electron bolometer mixer, NbN, NbTiN, superconducting detector, heterodyne receiver, THz mixer, submillimeter mixer, quasioptical receiver, double slot antenna, twin slot antenna, spiral antenna, receiver noise, FTS, Fourier Transform Spectrometer | ||||
| Abstract | The thesis reports the development of Hot Electron Bolometer (HEB) mixers for radio astronomy heterodyne receivers in THz frequency range. Part of this work is the fabrication of HEB devices, which are based on NbN or NbTiN superconducting thin films (â‰<a4>5 nm). They are integrated with wideband spiral or double-slot planar antennas. The mixer chips are incorporated into a quasi-optical receiver. The experimental part of this work focuses on the characterization of the receiver as a whole, and the HEB mixers as a part. Double side band receiver noise temperature and the IF bandwidth are reported for frequencies from 0.7 THz up to 2.6 THz. The spectrum of the direct response of HEB integrated with dierent antennas are measured using Fourier Transform Spectrometer (FTS). The effect of the bolometer size on total receiver performance and the LO power requirements is also discussed. A high-yield and reliable process for fabrication of NbN HEB mixers have been achieved. Over 100 devices with different bolometer geometry, film property and also different antennas have been fabricated and measured. The measured data enables us to discuss the impact of different parameters to the receiver overall performance. This work has provided NbN HEB mixers to the following receivers: TREND (Terahertz REceiver with NbN HEB Device) operating at 1.25-1.5 THz, installed in AST/RO Submillimeter Wave Telescope, Amundsen/Scott South Pole Station, in 2002-2003. Band 6-low (1.410-1.700 THz) and 6-high (1.700-1.920 THz) of the HIFI (Heterodyne Instrument for Far Infra-red) in the Herschel Space Observatory, due to launch in 2007 by ESA (European Space Agency). Besides, there has been continuous efforts to develop better models to explain the mixer performance more accurately. They are based on two temperature model for electrons and phonons and solving one-dimensional heat balance equations along the bolometer. The principles of these models are illustrated and the calculated results are compared with measured data. |
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| Address | |||||
| Corporate Author | Thesis | Ph.D. thesis | |||
| Publisher | Chalmers University of Technology | Place of Publication | Göteborg | Editor | |
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| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 910 | |||
| Permanent link to this record | |||||
| Author | Meledin, D.; Tong, C.-Y. E.; Blundell, R.; Goltsman, G. | ||||
| Title | Measurement of intermediate frequency bandwidth of hot electron bolometer mixers at terahertz frequency range | Type | Journal Article | ||
| Year | 2003 | Publication | IEEE Microw. Wireless Compon. Lett. | Abbreviated Journal | IEEE Microw. Wireless Compon. Lett. |
| Volume | 13 | Issue | 11 | Pages | 493-495 |
| Keywords | waveguide NbN HEB mixers | ||||
| Abstract | We have developed a new experimental setup for measuring the IF bandwidth of superconducting hot electron bolometer mixers. In our measurement system we use a chopped hot filament as a broadband signal source, and can perform a high-speed IF scan with no loss of accuracy when compared to coherent methods. Using this technique we have measured the 3 dB IF bandwidth of hot electron bolometer mixers, designed for THz frequency operation, and made from 3-4 nm thick NbN film deposited on an MgO buffer layer over crystalline quartz. | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1531-1309 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 1509 | |||
| Permanent link to this record | |||||
| Author | Tong, C.-Y.E.; Meledin, D.V.; Marrone, D.P.; Paine, S.N.; Gibson, H.; Blundell, R. | ||||
| Title | Near field vector beam measurements at 1 THz | Type | Journal Article | ||
| Year | 2003 | Publication | IEEE Microw. Compon. Lett. | Abbreviated Journal | |
| Volume | 13 | Issue | 6 | Pages | 235-237 |
| Keywords | HEB, mixer, waveguide, LO power, local oscillator power, saturation effect, dynamic range | ||||
| Abstract | We have performed near-field vector beam measurements at 1.03 THz to characterize and align the receiver optics of a superconducting receiver. The signal source is a harmonic generator mounted on an X-Y translation stage. We model the measured two-dimensional complex beam pattern by a fundamental Gaussian mode, from which we derive the position of the beam center, the beam radius and the direction of propagation. By performing scans in the planes separated by 400 mm, we have confirmed that our beam pattern measurements are highly reliable. | ||||
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| ISSN | 1531-1309 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | RPLAB @ lobanovyury @ | Serial | 574 | ||
| Permanent link to this record | |||||
| Author | Snyder Hale, David D. | ||||
| Title | A thermal infrared heterodyne receiver with applications to astronomy | Type | |||
| Year | 2003 | Publication | Abbreviated Journal | ||
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| Publisher | Place of Publication | Berkeley, CA 94720 | Editor | ||
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| Notes | Approved | no | |||
| Call Number | Serial | 373 | |||
| Permanent link to this record | |||||
| Author | Zwiller, V.; Aichele, T.; Seifert, W.; Persson, J.; Benson, O. | ||||
| Title | Generating visible single photons on demand with single InP quantum dots | Type | Journal Article | ||
| Year | 2003 | Publication | Applied Physics Letters | Abbreviated Journal | Appl. Phys. Lett. |
| Volume | 82 | Issue | 10 | Pages | 1509-1511 |
| Keywords | single photon, quantum dot, InP | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0003-6951 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | Serial | 503 | |||
| Permanent link to this record | |||||