Chip-integrated Spectroscopy Capable of Temperature Retrieval

TL;DR

This paper presents a chip-integrated spectroscope with high spectral resolution and temperature retrieval capability, useful for environmental, astrophysical, and plasma applications, demonstrated through laboratory testing with a simulated emission source.

Contribution

It introduces a novel chip-integrated spectroscopic device capable of temperature measurement using Doppler and collision broadening models, with potential for broad scientific applications.

Findings

Successfully demonstrated temperature retrieval from emission spectra.

Achieved 2 pm spectral resolution in a compact chip device.

Potential applications in environmental monitoring and astrophysics.

Abstract

We demonstrate a chip-integrated emission spectroscope capable of retrieving the temperature of the light sources. It consists of a single photon detector with low dark counts and a sweeping on-chip filter with 2 pm spectral resolution in the visible and near-infrared regimes. With wildfire sensing applications in mind, we test our system with a hollow cathode lamp to simulate the K-line emission, and show how the models of Doppler and collision broadening in the plasma can be used for temperature retrieval. With favorable device parameters, high spectral resolution, and a novel temperature retrieval capability, our technique may find broad applications in environmental monitoring, astrophysics, plasma physics, and so on.