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Optical resonance shifts are measured against temperature changes for different silica beads ranging from 80 to 450 µm in diameter. A micro-bead is fabricated by hydrogen flame fusing the tip of a single mode silica fibre/taper, and coupled to a fibre taper of submicrometre diameter. The coupling system in whispering-gallery modes is placed in an insulated cell. The air in the cell is slowly heated up from room temperature to about 10 K higher, and red shifts of a resonance wavelength duringdoi:10.1088/0022-3727/41/24/245111 fatcat:crutyzsodneevfpebwjvkwzsha