Frank J Woodberry

48262676, May 2, 1989

Nov 30, 1987

7/126809

Randolph L. Hall - Newbury Park CA
Frank J. Woodberry - Malibu CA
William H. Southwell - Thousand Oaks CA

Rockwell International Corporation - El Segundo CA

G02B 110
G02B 528

350 16

A gradient index filter can be fabricated with integral antireflection properties without degrading the inband performance of the filter. The filter is for placement between an incident medium and a substrate to reflect incident electromagnetic energy having wavelengths within a predetermined band of wavelengths and to transmit incident electromagnetic energy having wavelengths outside of the reflection band. The filter includes an antireflecting portion having a nominal refractive index profile selected to reflect a minimum amount of electromagnetic energy from a theoretical interface between a first medium having a first predetermined refractive index and a second medium having a second predetermined refractive index. A band rejecting portion has a periodic refractive index profile whose periodicity and amplitude are selected to reflect a maximum amount of electromagnetic energy within the relfection band. At least part of the nominal refractive index profile is modulated by the superposition thereon of at least part of the periodic refractive index profile.

49565559, Sep 11, 1990

Jun 30, 1989

7/374412

Frank J. Woodberry - Oxnard CA

Rockwell International Corporation - Thousand Oaks CA

G02B 520
G01J 336

250339

A multicolor focal plane array, which detects and distinguishes between incoming electromagnetic radiation within first and second bands of wavelengths, includes a substrate and a two dimensional array of detectors disposed on the substrate and responsive to electromagnetic radiation within a predetermined range of wavelengths including the first and second wavelength bands. A first multilayer thin film filter is disposed on the substrate and interposed between the incoming radiation and a first subset of the detectors in the array, while a second multilayer thin film filter is disposed on the substrate and interposed between the incoming radiation and a second subset of the detectors in the array. The first and second filters include a dielectric/thin metal/dielectric layer combination, the filters differing only in that the thickness of the dielectric layers in the first filter combination are adjusted to select the first wavelength band, while the thicknesses of the dielectric layers in the second filter combination are adjusted to select the second wavelength band. In this manner, the detectors in the first subset are made sensitive to radiation within the first wavelength band, while the detectors in the second subset are sensitive to radiation within the second wavelength band.