Abstract
Electro-optic responses of colloidal crystals of silica spheres have been studied using reflected and transmitted-light intensity measurements and time-resolved reflection spectroscopy. A He-Ne laser was used as the light source instead of a conventional white light source. Substantial electro-optic responses, ca. 100 times larger than with the white light source, are obtained when the Bragg peak wavelength of the crystals is matched with that of the laser light. The waveform of the electro-optic modulation for the laser light agrees with that estimated from the time-resolved reflection spectra. The second-order harmonics is beautifully obtained when the Bragg peak wavelength coincides with the laser light wavelength.
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