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	Author	González, Francisco Javier; Alda, Javier; Ilic, Bojan; Boreman, Glenn D.
	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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