1 October 2006 Fabrication and measurement of wideband achromatic waveplates for the mid-infrared region using subwavelength features
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Abstract
Subwavelength diffractive features etched into a substrate lead to form birefringence that can produce polarization sensitive elements such as wave plates. Using etched features allows for the development of pixelated devices to be used in conjunction with focal plane arrays in polarimetric imaging systems. Form birefringence exhibits dispersion that can be advantageous to the design of wave plates with an achromatic response. Taking advantage of this dispersion, diffractive wave plates with good achromatic characteristics can be designed for the 2- to 5-μm spectral region. Previous work in this area has produced good results over a subset of this wavelength band, but designing for this extended band is particularly challenging. The fabrication processes for the subwavelength features will be discussed and fabricated devices with a measured average phase retardation of 80.6 deg and rms variation of 9.41 deg will be presented.
© (2006) Society of Photo-Optical Instrumentation Engineers (SPIE)
Robert Boye, Robert Boye, Shanalyn A. Kemme, Shanalyn A. Kemme, Joel Wendt, Joel Wendt, Alvaro Cruz-Cabrera, Alvaro Cruz-Cabrera, Gregory Allen Vawter, Gregory Allen Vawter, Charles R. Alford, Charles R. Alford, Tony Carter, Tony Carter, Sally Samora, Sally Samora, } "Fabrication and measurement of wideband achromatic waveplates for the mid-infrared region using subwavelength features," Journal of Micro/Nanolithography, MEMS, and MOEMS 5(4), 043007 (1 October 2006). https://doi.org/10.1117/1.2397081 . Submission:
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