Local thermal resonance control of GaInP photonic crystal membrane cavities using ambient gas cooling
Sergei Sokolov (1), Jin Lian (1), Emre Y\"uce (1), Sylvain Combri\'e, (2), Gaelle Lehoucq (2), Alfredo De Rossi (2), Allard P. Mosk (1) ((1), Complex Photonic Systems (COPS), MESA+ Institute for Nanotechnology,, University of Twente, Enschede, The Netherlands
TL;DR
This paper demonstrates local control of GaInP photonic crystal cavity resonance by laser heating, showing how ambient gas thermal conductivity influences the temperature profile and resonance tuning precision.
Contribution
It introduces a method for spatially dependent tuning of photonic crystal cavities using ambient gas cooling, highlighting the impact of gas thermal conductivity on tuning accuracy.
Findings
Helium gas results in a narrower temperature profile of 2.8 μm.
Resonance tuning depends strongly on ambient gas thermal conductivity.
Experimental verification of the temperature profile width predicted by thermal modeling.
Abstract
We perform spatially dependent tuning of a GaInP photonic crystal cavity using a continuous wave violet laser. Local tuning is obtained by laser heating of the photonic crystal membrane. The cavity resonance shift is measured for different pump positions and for two ambient gases: helium and nitrogen. We find that the width of the temperature profile induced in the membrane depends strongly on the thermal conductivity of the ambient gas. For He gas a narrow spatial width of the temperature profile of 2.8 um is predicted and verified in experiment.
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