Abstract
Tuning of an integrated polymethyl methacrylate (PMMA) sphere whispering gallery mode (WGM) resonator is demonstrated. The WGM resonator is constructed by inserting a PMMA sphere into an etched microstructured fiber with suspended core, where the sphere with diameter of 31.5 μm functions as a WGM cavity. The suspended core with radius of 1.5 μm is used to feed and pick up the WGM field. Experimental results show that the maximum quality factor of the proposed WGM resonator is 5.9 ×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> and that the resonant wavelength shifts toward longer wavelength as the temperature decreases. A tuning range of 1.93 nm is realized by 210 mA dc current due to the thermo-optic effect.
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