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Author (up) Alda, Javier; Rico-García, José M.; López-Alonso, José M.; Boreman, G. openurl 
  Title Optical antennas for nano-photonic applications Type Journal Article
  Year 2005 Publication Nanotechnology Abbreviated Journal Nanotech.  
  Volume 16 Issue 5 Pages S230-S234  
  Keywords optical antennas  
  Abstract 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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  Call Number RPLAB @ gujma @ Serial 734  
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Author (up) González, Francisco Javier; Alda, Javier; Ilic, Bojan; Boreman, Glenn D. openurl 
  Title Infrared Antennas Coupled to Lithographic Fresnel Zone Plate Lenses Type Journal Article
  Year 2004 Publication Applied Optics Abbreviated Journal Appl. Opt.  
  Volume 43 Issue 33 Pages 6067-6073  
  Keywords optical antennas  
  Abstract 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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  Notes Approved no  
  Call Number RPLAB @ gujma @ Serial 740  
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