Infrared Absorption Coefficient for Shallow Donors in a Quantum Well
نویسندگان
چکیده
منابع مشابه
Noise in single quantum well infrared photodetectors
The noise of the dark current and photocurrent is an important factor in operation of the quantum well infrared photodetectors ~QWIPs!. For typical operating conditions, the main source of fluctuations in QWIPs is generationrecombination noise associated with the excitation of carriers from the QWs into the continuum and their capture into the QWs. For applications the study of noise in QWIPs i...
متن کاملA characterization technique for quantum well infrared photodetectors
Despite the rapid development of the quantum well ~QW! infrared technology, the intrinsic properties of the QW infrared photodetectors ~QWIPs! have not been directly measured under the operating conditions of the detector. In this work, we introduce a characterization technique, which utilizes the surface corrugation to probe the absorption coefficient and the photoconductive gain of a QWIP und...
متن کاملQuantum Well Infrared Photodetector Innovation Pathway
This case describes the development of quantum well infrared photodetectors (QWIPs). Following more than a decade of development, the QWIPs will fly aboard the Landsat Data Continuity Mission (LDCM) as part of the Thermal Infrared Sensor (TIRS). Over its history, Landsat data have enabled agricultural, forestry, air quality, and geological activity monitoring among other societal benefits. The ...
متن کاملThe 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...
متن کاملassessing absorption coefficient of hemoglobin in the breast phantom using near-infrared spectroscopy
objectives in this study, the absorption coefficient of hemoglobin (hb) was used to distinguish between normal and abnormal breast tissue. materials and methods a near-infrared source (637 nm) was transmitted from major and minor vessels of a breast phantom containing 2×, 4× concentrations of oxy- and deoxy-hb. the absorption coefficients were determined from spectrometer (sm) and powermeter (p...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Materials Science Forum
سال: 1991
ISSN: 1662-9752
DOI: 10.4028/www.scientific.net/msf.65-66.129