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| Author |
Kawakami, A; Saito, S.; Hyodo, M. |
| Title |
Fabrication of nano-antennas for superconducting Infrared detectors |
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Journal Article |
| Year |
2011 |
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IEEE Trans. Appl. Supercond. |
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21 |
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3 |
Pages |
632-635 |
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optical antennas, NbN/MgO/NbN/TiN/Al HEB, dipole antennas, IR, infrared |
| Abstract |
To improve the response performance of superconducting infrared detectors, we have developed a fabrication process for nano-antennas. A nano-antenna consists of a dipole antenna, and a superconducting thin film strip placed in the antenna's center. By measuring the transition temperature of the superconducting strips, we confirmed that their superconductivity maintained a good condition after the nano-antenna fabrication process. We also evaluated nano-antenna characteristics using Fourier transform infrared spectroscopy. The evaluated antenna length and width were respectively set at around 2400 nm and 400 nm, and the antennas were placed at intervals of several micrometers around the area of 1 mm2 . In an evaluation of spectral transmission characteristics, clear absorption caused by antenna effects was observed at around 1400 cm-1. High polarization dependencies were also observed. |
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Alda, Javier; Rico-García, José M.; López-Alonso, José M.; Boreman, G. |
| Title |
Optical antennas for nano-photonic applications |
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Journal Article |
| Year |
2005 |
Publication |
Nanotechnology |
Abbreviated Journal |
Nanotech. |
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16 |
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5 |
Pages |
S230-S234 |
| Keywords |
optical antennas |
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Antenna-coupled optical detectors, also named optical antennas, are being developed and proposed as alternative detection devices for the millimetre, infrared, and visible spectra. Optical and infrared antennas represent a class of optical components that couple electromagnetic radiation in the visible and infrared wavelengths in the same way as radioelectric antennas do at the corresponding wavelengths. The size of optical antennas is in the range of the detected wavelength and they involve fabrication techniques with nanoscale spatial resolution. Optical antennas have already proved and potential advantages in the detection of light showing polarization dependence, tuneability, and rapid time response. They also can be considered as point detectors and directionally sensitive elements. So far, these detectors have been thoroughly tested in the mid-infrared with some positive results in the visible. The measurement and characterization of optical antennas requires the use of an experimental set-up with nanometric resolution. On the other hand, a computation simulation of the interaction between the material structures and the incoming electromagnetic radiation is needed to explore alternative designs of practical devices. |
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RPLAB @ gujma @ |
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734 |
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Boreman, Glenn D. |
| Title |
A Users guide to IR detectors |
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Conference Article |
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2001 |
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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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735 |
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Bryant, Garnett W.; García de Abajo, F. Javier; Aizpurua, Javier |
| Title |
Mapping the Plasmon Resonances of Metallic Nanoantennas |
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Journal Article |
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2008 |
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Nano Letters |
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Nano Lett. |
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5 |
Issue |
2 |
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631-636 |
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optical antennas |
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We study the light scattering and surface plasmon resonances of Au nanorods that are commonly used as optical nanoantennas in analogy to dipole radio antennas for chemical and biodetection field-enhanced spectroscopies and scanned-probe microscopies. With the use of the boundary element method, we calculate the nanorod near-field and far-field response to show how the nanorod shape and dimensions determine its optical response. A full mapping of the size (length and radius) dependence for Au nanorods is obtained. The dipolar plasmon resonance wavelength λ shows a nearly linear dependence on total rod length L out to the largest lengths that we study. However, L is always substantially less than λ/2, indicating the difference between optical nanoantennas and long-wavelength traditional λ/2 antennas. Although it is often assumed that the plasmon wavelength scales with the nanorod aspect ratio, we find that this scaling does not apply except in the extreme limit of very small, spherical nanoparticles. The plasmon response depends critically on both the rod length and radius. Large (500 nm) differences in resonance wavelength are found for structures with different sizes but with the same aspect ratio. In addition, the plasmon resonance deduced from the near-field enhancement can be significantly red-shifted due to retardation from the resonance in far-field scattering. Large differences in near-field and far-field response, together with the breakdown of the simple scaling law must be accounted for in the choice and design of metallic λ/2 nanoantennas. We provide a general, practical map of the resonances for use in locating the desired response for gold nanoantennas. |
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RPLAB @ gujma @ |
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737 |
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| Author |
Codreanu, Iulian; Boreman, Glenn D. |
| Title |
Infrared microstrip dipole antennas |
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Journal Article |
| Year |
2001 |
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Microwave and Optical Technology Letters |
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Microw Opt Technol Lett |
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29 |
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6 |
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381-383 |
| 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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RPLAB @ gujma @ |
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738 |
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