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Bharadwaj, Palash; Deutsch, Bradley; Novotny, Lukas |
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Optical Antennas |
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2009 |
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Advances in Optics and Photonics |
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Adv. Opt. Photon |
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1 |
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438-483 |
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optical antennas |
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Optical antennas are an emerging concept in physical optics. Similar to radiowave
and microwave antennas, their purpose is to convert the energy of free propagating radiation to localized energy, and vice versa. Optical antennas exploit the unique properties of metal nanostructures, which behave as strongly coupled plasmas at ptical frequencies. The tutorial provides an account of the historical origins and the basic concepts and parameters associated with optical antennas. It also reviews recent work in the field and discusses areas of application, such as light-emitting devices, photovoltaics, and spectroscopy. |
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RPLAB @ gujma @ |
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754 |
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Kramer, B.; Chen, C-C.; Volakis, J.D. |
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The development of a mini-UWB antenna |
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Journal Article |
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2004 |
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Measurement and Techniques Association Symposium |
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AMTA |
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6 |
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optical antennas; Ultra Wide Band; Spiral Antenna, Dielectric Loading |
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There is a great interest in the automotive and military sectors for small and broadband antennas that meet modern communication needs. These needs require ultra-wide bandwidth (>10:1) UWB antennas, such as the spiral antenna. However, the physical size at the low-frequency end typically becomes too large for practical applications. To reduce the size of the antenna, miniaturization techniques must be employed such as the use of high-contrast dielectric materials. Size reduction using high-contrast materials has been demonstrated for narrowband antennas, such as patch antennas, but not for broadband antennas to our knowledge. Therefore, the concept of miniaturizing a broadband spiral antenna using dielectric materials will be investigated experimentally and numerically.Issues that arise from dielectric loading such as impedance reduction will also be addressed. It will be shown using the results from these studies that there are practical limitations to the amount of miniaturization which can be achieved. |
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RPLAB @ gujma @ |
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751 |
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Hocker, L. O.; Sokoloff, D. R.; Daneu, V.; Szoke, A.; Javan, A. |
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Frequency mixing in the infrared and far-infrared using a metal-to-metal point contact diode |
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1968 |
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Applied Physics Letters |
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Appl Phys Lett |
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12 |
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12 |
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optical antennas |
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Metalâ€toâ€metal point contact diodes were used to obtain the 54â€GHz beat notes between two adjacent 10.6â€μ CO2 laser transitions. The speed of the diodes in the farâ€infrared is at least 1000 GHz. This was tested with a 337â€μ HCN laser. |
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RPLAB @ gujma @ |
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742 |
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González, Francisco Javier; Alda, Javier; Ilic, Bojan; Boreman, Glenn D. |
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Infrared Antennas Coupled to Lithographic Fresnel Zone Plate Lenses |
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2004 |
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Applied Optics |
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Appl. Opt. |
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43 |
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33 |
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6067-6073 |
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optical antennas |
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Several designs for Fresnel zone plate lenses (FZPLs) to be used in conjunction with antenna-coupled infrared detectors have been fabricated and tested. The designs comprise square and circular FZPLs with different numbers of Fresnel zones working in transmissive or reflective modes designed to focus infrared energy on a square-spiral antenna connected to a microbolometer. A 163× maximum increase in response was obtained from a 15-zone circular FZPL in the transmissive mode. Sensor measurements of normalized detectivity D* resulted in a 2.67× increase with FZPLs compared with measurements made of square-spiral antennas without FZPLs. The experimental results are discussed and compared with values obtained from theoretical calculations. |
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RPLAB @ gujma @ |
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740 |
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Lobanov, Y.; Shcherbatenko, M.; Finkel, M.; Maslennikov, S.; Semenov, A.; Voronov, B. M.; Rodin, A. V.; Klapwijk, T. M.; Gol'tsman, G. N. |
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NbN hot-electron-bolometer mixer for operation in the near-IR frequency range |
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2015 |
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IEEE Trans. Appl. Supercond. |
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IEEE Trans. Appl. Supercond. |
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25 |
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3 |
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2300704 (1 to 4) |
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HEB mixer, IR, optical antenna |
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Traditionally, hot-electron-bolometer (HEB) mixers are employed for THz and “super-THz” heterodyne detection. To explore the near-IR spectral range, we propose a fiber-coupled NbN film based HEB mixer. To enhance the incident-light absorption, a quasi-antenna consisting of a set of parallel stripes of gold is used. To study the antenna effect on the mixer performance, we have experimentally studied a set of devices with different size of the Au stripe and spacing between the neighboring stripes. With use of the well-known isotherm technique we have estimated the absorption efficiency of the mixer, and the maximum efficiency has been observed for devices with the smallest pitch of the alternating NbN and NbN-Au stripes. Also, a proper alignment of the incident Eâƒ<2014>-field with respect to the stripes allows us to improve the coupling further. Studying IV-characteristics of the mixer under differently-aligned Eâƒ<2014>-field of the incident radiation, we have noticed a difference in their shape. This observation suggests that a difference exists in the way the two waves with orthogonal polarizations parallel and perpendicular Eâƒ<2014>-field to the stripes heat the electrons in the HEB mixer. The latter results in a variation in the electron temperature distribution over the HEB device irradiated by the two waves. |
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952 |
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