2021-06-09

Scientists use wide band gap semiconductor materials to advance nonlinear optical technology

By yqqlm yqqlm

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Although it has made great achievements in this field However, there is currently no platform that provides this functionality for the ultraviolet (UV) spectral range. Now, an international team of scientists including EPFL has realized the huge nonlinearity of ultraviolet light-matter mixed state (“exciton-poleon”) in a waveguide made of aluminum indium gallium nitride. The waveguide is A wide band gap semiconductor material behind solid-state lighting technologies (such as white LEDs) and blue laser diodes.

Scientists use wide band gap semiconductor materials to advance nonlinear optical technology

This research was published in “Nature The newsletter originated from the collaboration between the University of Sheffield, ITMO St. Petersburg, Chalmers University of Technology, the University of Iceland and LASPE of the Institute of Physics of the EPFL School of Basic Sciences.

The scientists used a compact 100-micron long device to measure the ultra-fast nonlinear spectral broadening of ultraviolet pulses. The nonlinearity is 1000 times greater than that observed in ordinary ultraviolet nonlinear materials. , Which is equivalent to the non-ultraviolet polarizer. The use of aluminum indium gallium nitride is an important step towards a new generation of integrated UV nonlinear light sources for advanced spectroscopy and measurement.

Raphaël Butté of EPFL, who participated in this research, said: “The system is a highly robust and mature semiconductor platform that exhibits strong exciton optical conversion in the ultraviolet spectrum and has the same effect at room temperature. The performance of the system. The nonlinear exciton interaction in the system is comparable to the interaction in other polarizer material systems, such as gallium arsenide and peroxide, however, they cannot work at the same time under ultraviolet light and room temperature.”</ p>