Halide perovskites provide a promising platform for non-linear, low-threshold polarization devices operating at room temperature
SPIE--International Society of Optics and Photonics
Image: Schematic diagram of the polaron parametric oscillator in the perovskite microcavity. see more
Image source: Wu et al., doi 10.1117/1.AP.3.5.055003
Optical parametric oscillators (OPO) have been widely used in fields ranging from spectrophotonics to quantum information. Although traditional OPOs usually have weak nonlinearities that lead to high power consumption, exciton polarons provide a smart alternative. A mixed quasi-particle composed of light and matter, the exciton polaron has a nonlinearity that is several orders of magnitude stronger than that of the traditional nonlinear photosystem, which is expected to significantly reduce power consumption. This nonlinearity plays a vital role not only in conceptually polarized devices such as neuromorphic computing systems, but also in emerging nonlinear quantum mechanisms with polaron blocking and quantum simulation.
Polaron parametric oscillators with low thresholds have been implemented in various geometries, but the exciton binding energy of these oscillators is very small, which means that they are mainly limited to quantum arsenide or cadmium telluride that require cryogenic cooling. Well microcavity. Room temperature equipment is required.
Halide perovskites have quickly become excellent semiconductors for photonic technologies ranging from LEDs and lasers to photodetectors. Recently, in order to design their applications in next-generation photonic devices, the nonlinear characteristics of perovskites have attracted great interest. The halide perovskite has the advantages of large exciton binding energy and strong nonlinear polaron-polaron interaction, and provides a promising platform for nonlinear, low-threshold polaron devices operating at room temperature.
As reported by Advanced Photonics, researchers from Nanyang Technological University in Singapore and Tsinghua University in China have recently developed an on-chip, low-threshold perovskite polaron parametric oscillator that can work at room temperature. Due to the lower energy dispersion of the S-shaped polaron, when the two polarons are excited at a critical angle and elastically scatter to the ground state (signal) and the higher k state (idle), the internal parameter oscillation will occur. Since polarons are essentially open (non-Hermitian) masses, spontaneous parameter down-conversion processes can occur in a wide range of angles. This feature provides great flexibility for design.
Xiong Qihua, professor of physics at Tsinghua University and senior author, said: "This work provides a practical method to realize low-threshold integrated nonlinear polarization devices." Room temperature operation opens up the way for the development of low-cost, scalable polarization devices. possibility.
Read the open access article "Perovskite Polaron Parameter Oscillator" by Jinqi Wu et al., Adv. Photonics 3(5), 055003 (2021), doi 10.1117/1.AP.3.5.055003.
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Copyright © 2021 American Association for the Advancement of Science (AAAS)