OPTICAL FILTER AND SENSOR SYSTEM
First Claim
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1. An optical filter having a passband at least partially overlapping with a wavelength range of 800 nm to 1100 nm, comprising:
- a filter stack including;
a plurality of hydrogenated silicon layers each having a refractive index of greater than 3 over the wavelength range of 800 nm to 1100 nm and an extinction coefficient of less than 0.0005 over the wavelength range of 800 nm to 1100 nm; and
a plurality of lower-refractive-index layers each having a refractive index of less than 3 over the wavelength range of 800 nm to 1100 nm, stacked in alternation with the plurality of hydrogenated silicon layers.
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Abstract
An optical filter having a passband at least partially overlapping with a wavelength range of 800 nm to 1100 nm is provided. The optical filter includes a filter stack formed of hydrogenated silicon layers and lower-refractive index layers stacked in alternation. The hydrogenated silicon layers each have a refractive index of greater than 3 over the wavelength range of 800 nm to 1100 nm and an extinction coefficient of less than 0.0005 over the wavelength range of 800 nm to 1100 nm.
34 Citations
20 Claims
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1. An optical filter having a passband at least partially overlapping with a wavelength range of 800 nm to 1100 nm, comprising:
a filter stack including; a plurality of hydrogenated silicon layers each having a refractive index of greater than 3 over the wavelength range of 800 nm to 1100 nm and an extinction coefficient of less than 0.0005 over the wavelength range of 800 nm to 1100 nm; and a plurality of lower-refractive-index layers each having a refractive index of less than 3 over the wavelength range of 800 nm to 1100 nm, stacked in alternation with the plurality of hydrogenated silicon layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A sensor system comprising:
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a light source for emitting light at an emission wavelength in a wavelength range of 800 nm to 1100 nm; an optical filter having a passband including the emission wavelength and at least partially overlapping with the wavelength range of 800 nm to 1100 nm, disposed to receive the emitted light, for transmitting the emitted light, comprising; a filter stack including; a plurality of hydrogenated silicon layers each having a refractive index of greater than 3 over the wavelength range of 800 nm to 1100 nm and an extinction coefficient of less than 0.0005 over the wavelength range of 800 nm to 1100 nm; and a plurality of lower-refractive-index layers each having a refractive index of less than 3 over the wavelength range of 800 nm to 1100 nm, stacked in alternation with the plurality of hydrogenated silicon layers; and a sensor, disposed to receive the emitted light after transmission by the optical filter, for detecting the emitted light. - View Dependent Claims (17, 18, 19, 20)
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Specification