摘要:
The invention relates to an optical fiber receiver (11) for optoelectronic integrated circuits (OEIC's) having an improved sensitivity and improved bandwidth. The improvements are achieved by subdividing the photodiodes into partial photodiodes (D1, D2), whereby each partial photodiode is connected to a respective transimpedance amplifier (20, 21), and the output signals of the individual transimpedance amplifiers are added inside a summation amplifier (30). The optical fiber receiver can be produced using different technologies: CMOS, BICMOS, BIPOLAR.
摘要:
Disclosed herein is a method of making an apparatus suitable for detecting x-ray, the method comprising: obtaining a substrate having a first surface and a second surface, wherein the substrate comprises an electronics system in or on the substrate, wherein the substrate comprises a plurality of electric contacts are on the first surface; obtaining a first chip comprising a first X-ray absorption layer, wherein the first X-ray absorption layer comprises an electrode; bonding the first chip to the substrate such that the electrode of the first X-ray absorption layer is electrically connected to at least one of the electrical contacts.
摘要:
In one embodiment, a femtowatt sensitivity optical detector is provided using one or more photodiodes, intended as a replacement for the photomultiplier based photon counting unit.
摘要:
Methods of reducing flicker noise in photodetectors are disclosed. A photodetector comprises a channel (303) made from a two-dimensional material like graphene and has a plurality of quantum dots (306) formed thereon for electron-hole pair (312, 313) generation from incident electromagnetic radiation (307). To a gate electrode (304) which is separated from the channel (303) by a dielectric material a time-varying voltage (311) is applied to modulate the response of the photodetector. From the resulting source-drain current, a signal is derived which is further processed to reduce flicker noise in the photodetector signal. The further signal processing is performed by a lock-in technique or by correlated double sampling. In a further embodiment, the time-varying voltage may be sufficiently large in magnitude to "reset" trapped charge states to a charged or discharged state each time the voltage is changed for further reduction of the flicker noise.
摘要:
A 2-D sensor array includes a semiconductor substrate and a plurality of pixels disposed on the semiconductor substrate. Each pixel includes a coupling region and a junction region, and a slab waveguide structure disposed on the semiconductor substrate and extending from the coupling region to the region. The slab waveguide includes a confinement layer disposed between a first cladding layer and a second cladding layer. The first cladding and the second cladding each have a refractive index that is lower than a refractive index of the confinement layer. Each pixel also includes a coupling structure disposed in the coupling region and within the slab waveguide. The coupling structure includes two materials having different indices of refraction arranged as a grating defined by a grating period. The junction region comprises a p-n junction in communication with electrical contacts for biasing and collection of carriers resulting from absorption of incident radiation.
摘要:
In one embodiment, a femtowatt sensitivity optical detector is provided using one or more photodiodes, intended as a replacement for the photomultiplier based photon counting unit.