Project Title:

Sub-Wavelength Structured Surfaces for Infrared Optical Elements

92-1-08.16-7990                                                    NAS07-1238
Sub-Wavelength Structured Surfaces for Infrared
     Optical Elements
Rochester Photonics Corporation
80 O'Connor Road
Fairport, NY  14450
Dean Faklis                                          (716-377-7900)

Abstract:

     An important innovation for infrared optical systems is the
use of sub-wavelength-period diffractive structures for the
synthesis of polarizers, beamsplitters, and graded-phase optics.
By patterning a substrate with a sub-wavelength-period structure,
one can synthesize an effective refractive index distribution to
implement certain optical functions including antireflection
surfaces. This project's approach will be based on one- and two-
dimensional, binary- and multi-phase-level diffraction gratings to
synthesize various optical elements for the thermal infrared
spectrum. A series of computer simulations, using rigorous
coupled-wave theory and effective medium theory, will be
performed. The dependence on such grating parameters as groove
depth, duty cycle, and wavelength will be analyzed. Manufacturing
constraints will be integrated into the designs, and key
technologies required for fabrication of these advanced optical
elements will be identified. Phase II will develop, fabricate, and
test lightweight, infrared optical elements. 

Potential Commercial Application:

Potential Commercial Applications:  Sub-wavelength structured
surfaces may offer superior optical solutions for infrared sensor
systems with applications in low observable technology, improving
the efficiency of solar radiation detectors, high-density WORM
optical data storage, and fiber-optics-based biosensors.

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