Enhancement in multicolor photoresponse for quaternary capped In0.5Ga0.5As/GaAs quantum dot infrared photodetectors implanted with hydrogen ions

Upadhyay, S.; Mandal, Ajay; Agarwal, Akshay; Ghadi, Hemant; Kumari, Kiran; Basu, Arindam; Subrahmanyam, N.B.V.; Singh, P.; Chakrabarti, Subhananda

doi:10.1016/j.materresbull.2016.07.030

Cited by 8 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the optical response in nanostructures is larger than bulk materials [2] that motivated researchers to investigate optical phenomena like optical absorption coefficients [3][4], Nonlinear Optical Rectification (NOR) [5][6], refractive index changes (RICs) [4,7,8], second [9][10][11] and third harmonic generation [12][13][14]. These nonlinear optical features are the basis of many modern optoelectronic devices, such as laser amplifiers [15], phototransistors [16], solar cell [17], laser diodes (Liu et al 2011) [18] infrared photodetector [19], optical switching [20]. Quantum dots known as artificial atoms are more like atoms than bulk materials because of their quantum mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

Hasanirokh

2023

Preprint

View full text Add to dashboard Cite

In the present work, we have explored how the pressure, temperature and size of a GaAs quantum ring in the presence of Rashba and Dresselhaus spin–orbit couplings (SOC) can affect the energy states, dipole transition matrix elements (DTMEs), optical absorption coefficients (OACs) and refractive index changes (RICs). In addition to the theoretical beauty of this important and exciting area of research, it represents the attractive potential applications in the growth of optoelectronics devices. The results have indicated that the ground state energy values rise with pressure and Dresselhaus coupling. Meanwhile, increasing the temperature and Rashba coupling as well as the ring’s size leads to a decrement of energy levels. Taking the transition from the ground state to the first excited state, we have found that the temperature, pressure, inner and outer radius decrease DTMEs because of a drop in wave functions overlap. Therefore, the presence of SOCs, pressure, temperature and dimensions of the quantum ring dominate the electronic behavior and consequently control the absorption as well as the refractive index of the nano structure. A significant enhancement of the OACs and RICs curves is witnessed when the pressure, ring geometric, and Rashba strength are enlarged, but Increasing Dresselhaus coefficient decreases OACs and RICs. These parameters are responsible for blue shifts in the optical absorption. These results can be suitable in the construction of spin-based devices.

show abstract