Temperature-dependent second-harmonic generation from color centers in diamond

TL;DR

This study explores how temperature affects second-harmonic generation in nitrogen-vacancy diamond, revealing phonon scattering mechanisms and proposing a new method for diamond-based optical temperature sensing.

Contribution

It provides the first detailed analysis of temperature-dependent SHG in NV diamond and introduces a model highlighting optical phonon scattering's dominance.

Findings

SHG intensity decreases with temperature from 20-300°C

Optical phonon scattering dominates over acoustic phonon scattering

Proposes a new approach for diamond-based nonlinear optical temperature sensors

Abstract

Under infrared ultrashort pulse laser stimulation, we investigated temperature-dependent second-harmonic generation (SHG) from nitrogen-vacancy (NV)-introduced bulk diamond. The SHG intensity decreases in the temperature range of 20-300 $^{\circ}C$, due to phase mismatching caused by refractive index modification. We discovered that optical phonon scattering outperforms acoustic phonon one in NV diamond by fitting the temperature dependence of SHG intensity using a model based on the bandgap change via the deformation potential interaction. This study presents an efficient and viable way for creating diamond-based nonlinear optical temperature sensing.