Broad band pass filter including metal layers and dielectric lay

Details Broad band pass filter including metal layers and dielectric lay Broad band pass filter including metal layers and dielectric lay

1993-04-13

1994-08-09

LaRoche, Eugene R.

Optical: systems and elements

Absorption filter

359359, 359360, 359586, 359588, G02B 718, G02B 528

Patent

active

053371917

ABSTRACT:
A visible light transmitting, near-infrared reflecting filter for a substrate, comprises a central group of layers (26) including two metal layers (32 and 36) separated by a spacer-layer (34) and bounded by admittance-matching layers (32 and 38). The spacer-layer has an optical thickness of less than one-half wavelength of visible light and the admittance-matching layers have an optical thickness of less than one-quarter wavelength of visible light. On each side of the central group is a group of layers (24 and 28) for boosting near infrared reflectivity of the filter, and for providing low reflection and high transmission for visible light. Each of these near-infrared-reflection-boosting groups including a high refractive index layer (40 and 42) and at least one low refractive index layer (46 and 48). The high index layer has an optical thickness of about one-quarter wavelength at a near-infrared wavelength, and the low refractive index layer has a refractive index of less than one-quarter wavelength at the near-infrared wavelength.

REFERENCES:
patent: 4145113 (1979-03-01), Ranninger et al.
patent: 4865405 (1989-09-01), Kageyama
patent: 4960310 (1990-10-01), Cushing
patent: 5183700 (1993-02-01), Austin
"Induced Transmission in Absorbing Films Applied to Band Pass filter Design", Peter H. Berning and A. F. Turner, J. Opt. Soc. Am, 47, 3, 230-9 (Mar. 1957).
"A new approach to the design of metal-dielectric thin-film optical coatings", H. A. Macleod, Optical Acta, 25, 2, 93-106 (1978).
"Coatings with Induced Transmission", P. H. Lissberger, Applied Optics, 20, 1, 95-104, (Jan. 1981).

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