Measurement of the linear thermo-optical coefficient of   Ga$_{0.51}$In$_{0.49}$P using photonic crystal nanocavities
  Ga$_{0.51}$In$_{0.49}$P is a promising candidate for thermally tunable nanophotonic devices due to its low thermal conductivity. In this work we study its thermo-optical response. We obtain the linear thermo-optical coefficient $dn/dT=2.0\pm0.3\cdot 10^{-4}\,\rm{K}^{-1}$ by investigating the transmission properties of a single mode-gap photonic crystal nanocavity. 
Sergei Sokolov, Jin Lian, Sylvain Combri\'e, Alfredo De Rossi, Allard   P. Mosk
physics.optics cond-mat.mes-hall cond-mat.mtrl-sci