we have simulated the carrier concentration and temporal response characteristics of a back-gated metal- semiconductor-metal (bg-msm) photodetector in one dimension as a function of optical pulse position on the active region in an equilibrium condition (without bias voltage to the photodetector). we have adopted a nonlinear ambipolar transport model to simulate the behavior of photo-generated ...

Well-aligned Cu-doped ZnO nanorods were successfully synthesized on polyethylene terephthalate (PET) substrate using chemical bath deposition method. The structural and optical properties of Cu-doped ZnO nanorods were investigated using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and photoluminescence (PL) spectroscopy...

In this paper a resonant tunnelling quantum well infrared photodetector (RT-QWIP) is discussed. Each period of this photodetector structure comprises of a resonant tunnelling structure (AlAs/AlGaAs/AlAs) nearby a quantum well (AlGaAs/GaAs). In this photodetector, photocurrent is produced when an electron makes a transition from the ground state of the well to an excited state which is coupled t...

munication systems because of their high probability of intercept, and their simultaneous processing of multiple signals in real-timely. They also have many merits such as simple structure, light weight and low cost. Recently, to realize optical transmission system with lager capacity and high-speed, an optical module with high performance, low cost and small size is strongly required. In this ...

In this work an analytical modeling of p+-Hg0.81Cd0.19Te/n0-Hg0.81Cd0.19Te/CdZnTe, homojunction photodetector has been analyzed theoretically at 77K. A generic model of HgCdTe based photovoltaic detector has been developed using the closed form equations. Device parameters are obtained of the proposed photodetector and studied in terms of dark current, resistance area-product, quantum efficienc...

Laser speckle produced from a diffuse object can be used in determining the angular position of a rotating object. When the object rotates the backscattered speckle pattern, which changes continuously but repeats exactly with every revolution, is sampled by a suitably positioned photodetector. The photodetector output signal is periodic, and one period is stored in the memory as a reference. Sh...

In this paper, we report on the enhancement of spectral photoresponsivity of porous silicon metal-semiconductor metal (PS-MSM) photodetector embedded with colloidal quantum dots (QDs) inside the pore layer. The detection efficiency of QDs/PS hybrid-MSM photodetector was enhanced by five times larger than that of the undoped PS-MSM photodetector. The bandgap alignment between PS (approximately 1...

Based on the requirement of squeezed state generation, we build the phase relationship between two electronic local oscillators for the cavity- and phase-locking branches, and a 2-way 90° power splitter is adopted to satisfy the phase relationship simultaneously, which greatly simplifies the experimental setup and adjusting process. A LC parallel resonant circuit, which is composed by the inher...

In this paper, the design of a novel photodetector, working at 1.55μm and completely silicon compatible, is reported. The device is a resonant cavity enhanced (RCE) structure incorporating a silicon photodetector based on the internal photoemission effect. In order to quantify the performance of photodetector, quantum efficiency including the image force effect as a function of bias voltage are...