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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 |
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Conference Article |
| Year |
2001 |
Publication |
Proc. SPIE |
Abbreviated Journal |
Proc. SPIE |
| Volume |
4293 |
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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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| Author |
Novotny, L. |
| Title |
The history of near-field optics |
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Manuscript |
| Year |
2007 |
Publication |
Progress in Optics |
Abbreviated Journal |
Prog. Opt. |
| Volume |
50 |
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137-180 |
| Keywords |
optical antennas |
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This article provides a review of early work and developments in the field of near-field optics. The roots trace back to the letters exchanged between Edward Hutchinson Synge and Albert Einstein in 1928 and, because of the analogy to antenna theory and lightning rods, the origins project back to the time of Benjamin Franklin who discovered the wonderful Effect of Points both in drawing off and throwing off the Electrical Fire. The modern interest was mainly inspired by the invention of scanning probe microscopy and by the first optical near-field measurements by Dieter W. Pohl and co-workers at the IBM Research Laboratory in R¨uschlikon, Switzerland, and also by parallel developments of other groups. Near-field optics received inspiration from the fields of surface enhanced spectroscopy and from studies of energy transfer. While optical near-fields were extensively exploited for overcoming the diffraction limit in optical imaging the study of their physical aspects revealed unique properties which cannot be imitated by free propagating radiation. |
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752 |
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Gonzalez, F.J.; Ilic, B.; Alda, J.; Boreman, G.D. |
| Title |
Antenna-coupled infrared detectors for imaging applications |
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Journal Article |
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2005 |
Publication |
IEEE J. Sel. Topics Quantum Electron. |
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11 |
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1 |
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117 - 120 |
| Keywords |
optical antennas |
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Infrared focal plane arrays (IRFPAs) are a critical component in advanced infrared imaging systems. IRFPAs are made up of two parts, a detector array and a readout integrated circuit (ROIC) multiplexer. Current ROIC technology has typical pitch sizes of 20×20 to 50×50 μm2. In order to make antenna-coupled detectors suited for infrared imaging systems, two-dimensional (2-D) arrays have been fabricated that cover a whole pixel area with the penalty of increasing the noise figure of the detector and, therefore, reducing its performance. By coupling a Fresnel zone plate lens to a single element antenna-coupled detector, infrared radiation can be collected over a typical pixel area and still keep low-noise levels. A Fresnel zone plate lens coupled to a single-element square-spiral-coupled infrared detector has been fabricated and its performance compared to single element antenna-coupled detectors and 2-D arrays of antenna coupled detectors. Measurements made at 10.6 μm showed a two-order-of-magnitude increase in SNR and a ~× increase in D* as compared to 2-D arrays of antenna-coupled detectors. |
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RPLAB @ gujma @ |
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741 |
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| Author |
Novotny, Lukas; van Hulst, Niek |
| Title |
Antennas for light |
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Journal Article |
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2011 |
Publication |
Nature Photonics |
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Nat. Photon. |
| Volume |
5 |
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2 |
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83-90 |
| Keywords |
optical antennas |
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Optical antennas are devices that convert freely propagating optical radiation into localized energy, and vice versa. They enable the control and manipulation of optical fields at the nanometre scale, and hold promise for enhancing the performance and efficiency of photodetection, light emission and sensing. Although many of the properties and parameters of optical antennas are similar to their radiowave and microwave counterparts, they have important differences resulting from their small size and the resonant properties of metal nanostructures. This Review summarizes the physical properties of optical antennas, provides a summary of some of the most important recent developments in the field, discusses the potential applications and identifies the future challenges and opportunities. |
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RPLAB @ gujma @ |
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748 |
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| Author |
Boreman, Glenn D. |
| Title |
A Users guide to IR detectors |
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Conference Article |
| Year |
2001 |
Publication |
Proc. SPIE |
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Proc. SPIE |
| Volume |
4420 |
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79-90 |
| Keywords |
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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RPLAB @ gujma @ |
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735 |
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