Transient thermoreflectance imaging of active photonic crystals

Moreau, Virginie; Tessier, Gilles; Raineri, Fabrice; Brunstein, Maia; Yacomotti, Alejandro; Raj, Rama; Sagnes, Isabelle; Levenson, Ariel; de Wilde, Yannick
March 2010
Applied Physics Letters;3/1/2010, Vol. 96 Issue 9, p091103
Academic Journal
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.


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