Spectrally resolved detection in transient-reflectivity measurements of coherent optical phonons in diamond

TL;DR

This paper demonstrates spectrally resolved detection of coherent optical phonons in diamond using ultrashort infrared pump-probe measurements, significantly enhancing measurement sensitivity compared to traditional spectrally integrated methods.

Contribution

It introduces a spectrally resolved detection technique for coherent phonons in diamond, improving sensitivity by about 35 times over conventional methods.

Findings

Enhanced sensitivity in phonon detection by 35 times

Spectral resolution reveals detailed phonon dynamics

Mechanistic explanation of sensitivity improvement

Abstract

Coherent optical phonons in bulk solid system play a crucial role in understanding and designing light-matter interactions and can be detected by the transient-reflectivity measurement. In this paper, we demonstrate spectrally resolved detection of coherent optical phonons in diamond from ultrashort infrared pump-probe measurements using optical band-pass filters. We show that this enhances the sensitivity approximately 35 times in measuring the coherent oscillations in the transient reflectivity compared with the commonly used spectrally integrated measurement. To explain this observation, we discuss its mechanism.