Mitigate the variation of energy band gap with electric field induced by quantum confinement Stark effect via a gradient quantum system for frequency‐stable laser diodes
Year: 2025
Type: article
Abstract: Most light‐emitting devices based on quantum‐confined structures are commonly utilized as electrically injected devices. However, the electric‐field‐dependent energy band gap induced by the quantum confinement Stark effect (QCSE) usually hinders the realization of frequency‐stable laser devices. This is because the change in the energy band gap, which also means the corresponding change in the photon energy, will result in an electric‐field‐dependent frequency. Here, we propose a novel approach to mitigate this electric‐field‐dependent variation in the energy band gap by employing a gradient quantum system. In this system, the energy band edges are inclined due to the action of the indium (In)‐segregation effect. This special design can effectively weaken the changes in the band profile associated with the electric field effect and counteract the electric‐field‐dependent band gap variations within the active region to a certain extent. Experimental studies indicate that the energy band gap of this gradient quantum system remains almost unchanged (<18.9 μeV cm 2 /A) even under a relatively strong applied electric field. Meanwhile, compared with the traditional GaAs quantum well, the efficiency improvement in the band gap stability of our nanowire–well gradient system is 64.1 % and 70.6 % for the TE and TM polarization modes, respectively, which suggests that our proposed gradient quantum structure can significantly mitigate the electric‐field‐induced change in the energy band gap. This achievement is of great significance for advancing the development of high‐performance frequency‐stable laser devices in some advanced fields, such as quantum sensing systems and optical communications.
Source: Nanophotonics
Authors: Yuhong Wang, Yiwei Zhang, Zihan Jiang, Jian Wu, Chunqing Gao
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,995
OpenAlex ID: W4417123990