Fig. 9: Thermo-optic compensation in WGM microresonators.

a Thermal sensitivity reduction by optimizing the geometry of liquid core aluminosilicate and silica optical rings¹²⁹. b–d Thermo-optic compensation of WGM microresonators by coating with PDMS (b)¹³¹, a quantum dot (c)¹³³, and glycerol content in the surrounding aqueous medium (d)¹³⁴. a Reprinted with permission from ref. ¹²⁹ [OSA The Optical Society]. b Reprinted with permission from ref. ¹³¹ [American Institute of Physics]. c Reprinted with permission from ref. ¹³³ [American Institute of Physics]. d Reprinted with permission from ref. ¹³⁴ [American Institute of Physics]