PHOTONIC LOCK BASED HIGH BANDWIDTH PHOTODETECTOR
First Claim
1. A photodetector device comprising:
- a first reflective region;
a second reflective region; and
a light absorption region positioned between the first and second reflective regions so as to absorb light passed through the first reflective region and reflected between the first and second reflective regions,wherein the first reflective region has a reflectivity that causes an amount of light energy that escapes from the first reflective region, after the light being reflected by the second reflective region, to be substantially zero.
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Abstract
The technique introduced herein decouples the traditional relationship between bandwidth and responsivity, thereby providing a more flexible and wider photodetector design space. In certain embodiments of the technique introduced here, a photodetector device includes a first mirror, a second mirror, and a light absorption region positioned between the first and second reflective mirrors. For example, the first mirror can be a partial mirror, and the second mirror can be a high-reflectivity mirror. The light absorption region is positioned to absorb incident light that is passed through the first mirror and reflected between the first and second mirrors. The first mirror can be configured to exhibit a reflectivity that causes an amount of light energy that escapes from the first mirror, after the light being reflected back by the second mirror, to be zero or near zero.
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Citations
24 Claims
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1. A photodetector device comprising:
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a first reflective region; a second reflective region; and a light absorption region positioned between the first and second reflective regions so as to absorb light passed through the first reflective region and reflected between the first and second reflective regions, wherein the first reflective region has a reflectivity that causes an amount of light energy that escapes from the first reflective region, after the light being reflected by the second reflective region, to be substantially zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for forming a photodetector device, the method comprising:
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forming a light absorption region and first reflective region and a second reflective region over a substrate, wherein the first and second reflective regions are formed on substantially the same planar surface; and forming a light absorption region between the first and second reflective regions so as to absorb light passed through the first reflective region and reflected between the first and second reflective regions, wherein the first reflective region has a reflectivity that causes an amount of light energy that escapes from the first reflective region, after the light being reflected by the second reflective region, to be substantially zero. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method for forming a photodetector device, the method comprising:
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forming a light absorption region; and forming a first and a second reflective regions; wherein the light absorption region is positioned between the first and second reflective regions so as to absorb light passed through the first reflective region and reflected between the first and second reflective regions, and wherein the first reflective region has a reflectivity that causes an amount of light energy that escapes from the first reflective region, after the light being reflected by the second reflective region, to be substantially zero. - View Dependent Claims (21, 22, 23)
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24. An optoelectronic system for sensing optical signals, the system comprising:
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a microcontroller; a memory; and an optoelectronic apparatus including a photodetector that includes; a first reflective region; a second reflective region; and a light absorption region positioned between the first and second reflective regions so as to absorb light passed through the first reflective region and reflected between the first and second reflective regions, wherein the first reflective region has a reflectivity that causes an amount of light energy that escapes from the first reflective region, after the light being reflected by the second reflective region, to be substantially zero, wherein (a) the first reflective region'"'"'s reflectivity, (b) a reflectivity of the second reflection region, and (c) an attenuation coefficient of the light absorption region are collectively configured such that, when the light enters the light absorption region and reflects between the first and second reflective regions, the light resonates in the light absorption region, wherein the first reflective region'"'"'s reflectivity is configured to be substantially equal to a one-circulation attenuation coefficient of the light absorption region, and wherein the one-circulation attenuation coefficient indicates a ratio of remainder light energy over entrance light energy in one circulation.
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Specification