Photodetector Arrangement for Measuring the State of Polarization of

Photodetector Arrangement for Measuring the State of Polarization of Light

The Effect of Structural Parameters on the Electronic States and Oscillator Strength of a Resonant Tunneling Quantum Well Infrared Photodetector

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...

Towards Measurement of Polarization Properties of Skin using the Ellipsometry Technique

Introduction: The human skin is an active medium from the optical point of view. Therefore, the diagnostic and therapeutic techniques employing light are increasing. Current optical techniques are based on the measurement of the intensity of reflected absorbed or backscattered light from or within skin. Studies have shown that biological tissues, and in particular skin, demonstrate polarization...

Polarization preserving quantum nondemolition photodetector

A polarization preserving quantum nondemolition photodetector is proposed based on nonlinearities obtainable through quantum coherence effects. An atomic level scheme is devised such that in the presence of strong linearly polarized drive field a coherent weak probe field acquires a phase proportional to the number of photons in the signal mode immaterial of its polarization state. It is also s...

Fabrication of Ultraviolet Photodetector Based on ZnO Nanostructures and Calcium Impurities Using Sol-Gel Method

In this paper an ultraviolet (UV) photodetector has been fabricated using ZnO nanostructures. The cheap fabrication process, high-quality nanostructures and the desired results for the photodetector are the most important characteristics of the proposed method. ZnO nanostructures have been grown using sol-gel method. In order to increase the sensitivity, calcium impurities have been added to na...