# All-optical tuning of a diamond micro-disk resonator on silicon

## TL;DR

This paper demonstrates the integration of diamond micro-disk resonators with silicon photonics, enabling all-optical tuning of resonant wavelengths over a broad range, which advances scalable quantum and nonlinear photonic applications.

## Contribution

It introduces a micro-assembly method for integrating diamond micro-resonators onto silicon circuits, achieving high Q-factors and significant thermal tuning capabilities.

## Key findings

- Loaded Q-factor up to 1.05x10^5 achieved
- Resonant wavelength tunable over 450 pm with mW optical pump
- Successful integration of diamond resonators on silicon platform

## Abstract

High quality integrated diamond photonic devices have previously been demonstrated in applications from non-linear photonics to on-chip quantum optics. However, the small sample sizes of single crystal material available, and the difficulty in tuning its optical properties, are barriers to the scaling of these technologies. Both of these issues can be addressed by integrating micron scale diamond devices onto host photonic integrated circuits using a highly accurate micro-assembly method. In this work a diamond micro-disk resonator is integrated with a standard single mode silicon-on-insulator waveguide, exhibiting an average loaded Q-factor of 3.1x10^4 across a range of spatial modes, with a maximum loaded Q-factor of 1.05x10^5. The micron scale device size and high thermal impedance of the silica interface layer allow for significant thermal loading and continuous resonant wavelength tuning across a 450 pm range using a mW level optical pump. This diamond-on-demand integration technique paves the way for tunable devices coupled across large scale photonic circuits.