Chip-scale optical spectrum analyzers with enhanced resolution
First Claim
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1. A device comprising:
- a Fabry-Perot cavity filter comprising a first mirror and a second mirror, wherein a gap between the first and the second mirror monotonically varies as a function of width of the filter; and
a channel selection filter comprising a metal nanooptic filter array based on plasmon resonance,wherein the channel selection filter has a wider wavelength passband width than the Fabry-Perot cavity filter andwherein the metal nanooptic filter array comprises a plurality of subwavelength apertures in a metal film or between metal islands, such that a distance between the apertures in different regions of the metal nanooptic filter array is different.
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Abstract
A Fabry-Perot cavity filter includes a first mirror and a second mirror. A gap between the first and the second mirror monotonically varies as a function of width of the filter. This filter may be used with photodetector and a channel selection filter in an optical device, such as a spectrum analyzer. The channel selection filter may be a metal nanooptic filter array which includes plurality of subwavelength apertures in a metal film or between metal islands.
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Citations
24 Claims
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1. A device comprising:
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a Fabry-Perot cavity filter comprising a first mirror and a second mirror, wherein a gap between the first and the second mirror monotonically varies as a function of width of the filter; and a channel selection filter comprising a metal nanooptic filter array based on plasmon resonance, wherein the channel selection filter has a wider wavelength passband width than the Fabry-Perot cavity filter and wherein the metal nanooptic filter array comprises a plurality of subwavelength apertures in a metal film or between metal islands, such that a distance between the apertures in different regions of the metal nanooptic filter array is different. - View Dependent Claims (2, 3, 4, 5, 6, 18, 20)
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7. A device, comprising:
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a Fabry-Perot cavity filter comprising a first mirror and a second mirror wherein a gap between the first and the second mirror is variable; and a photodetector array, wherein a first photodetector pixel is adapted to detect radiation from the Fabry-Perot cavity filter position having a first gap height and a second photodetector pixel is adapted to detect radiation from the Fabry-Perot cavity filter position having a second gap height different from the first gap height; a channel selection filter array positioned such that only one peak from the Fabry-Perot cavity filter is incident on each pixel of the photodetector array; wherein the channel selection filter comprises a metal nanooptic filter array based on plasmon resonance; wherein the channel selection filter has a wider wavelength passband width than the Fabry-Perot cavity filter; and wherein the metal nanooptic filter array comprises a plurality of subwavelength apertures in a metal film or between metal islands, such that a distance between the apertures in different regions of the metal nanooptic filter array is different. - View Dependent Claims (8, 9, 10, 11, 19, 21)
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12. An optical filtering method, comprising:
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passing incident radiation through a Fabry-Perot cavity filter comprising a first mirror and a second mirror, wherein a gap between the first and the second mirror monotonically varies as a function of width of the filter; passing the incident radiation through a channel selection filter such that only one peak from the incident radiation that passes through Fabry-Perot cavity filter is incident on each pixel of a photodetector; wherein the channel selection filter comprises a metal nanooptic filter array which comprises a plurality of subwavelength apertures in a metal film or between metal islands, such that a distance between the apertures in different regions of the metal nanooptic filter array is different; and wherein the incident radiation is filtered by the channel selection filter based on plasmon resonance between the incident radiation and the metal film or metal islands of the channel selection filter. - View Dependent Claims (13, 14, 15, 16, 17, 22, 23, 24)
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Specification