Propagation properties of light in AlGaN/GaN quantum-well waveguides

وابستگی انرژی گذارهای اپتیکی در نانوساختارهای چاههای کوانتومی GaN/AlGaN به پهنای سد و چاه کوانتومی

Internal polarizations field which take place in quantum structures of group-III nitrides have an important consequence on their optical properties. Optical properties of wurtzite AlGaN/GaN quantum well (QW) structures grown by MBE and MOCVD on c-plane sapphire substrates have been investigated by means of photoluminescence (PL) and time resolved photoluminescence (TRPL) at low-temperature. PL ...

بهره کوانتومی آشکارساز نقطه کوانتومی هسته/ پوسته GaN/AlGaN

 In this work, oscillator strength and quantum efficiency of new spherical GaN/AlGaN quantum dot was investigated. In order to obtain these parameters, at first, Schrödinger equation is solved in GaN/AlGaN spherical coordinate system in effective mass approximation, and energy level, wave function and transition matrix element of the parameter are obtained. The results show that oscillator stre...

Modeling of High Temperature GaN Quantum Dot Infrared Photodetectors

In this paper, we present calculations for different parameters of quantum dot infrared photodetectors. We considered a structure which includes quantum dots with large conduction-band-offset materials (GaN/AlGaN). Single band effective mass approximation has been applied in order to calculate the electronic structure. Throughout the modeling, we tried to consider the limiting factors which dec...

Fabrication and optical studies of AlGaN/GaN quantum-well waveguides

Exciton-polariton propagation in A1GaN/GaN quantum-well waveguides probed by time-resolved photoluminescence

The propagation properties of light in AIGaN/GaN multiple-quantum-well (MQW) waveguides have been studied by timeresolved photoluminescence (PL) spectroscopy. The waveguides were patterned with fixed width of 0.5 j.im but orientations varying from 3oo to 600 relative to the a-axis of GaN by electron-beam lithography and inductively-coupled plasma (ICP) dry etching. The peak position and line-wi...