Transient thermoreflectance imaging is used to study the dynamics of the temperature inside active two-dimensional photonic crystals (PhCs). We developed a pump-probe setup suited for optically pumped devices that presents submicrosecond time resolution and submicrometer spatial resolution. Characteristic thermal dissipation times of 429 ns in a PhC Bloch mode cavity and of 999 ns in a PhC membrane are measured. This technique gives also access to the diffusivity of the suspended PhC.
Transient thermoreflectance imaging of active photonic crystals
Virginie Moreau, Gilles Tessier, Fabrice Raineri, Maia Brunstein, Alejandro Yacomotti, Rama Raj, Isabelle Sagnes, Ariel Levenson, Yannick De Wilde; Transient thermoreflectance imaging of active photonic crystals. Appl. Phys. Lett. 1 March 2010; 96 (9): 091103. https://doi.org/10.1063/1.3323100
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