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Research
Photonic Crystal Optical Modulators
By building a photonic crystal reflectance filter that incorporates material with refractive index that is tunable by the application of electric fields or by illumination with light from a laser, we can make devices that can modulate the transmission of light at wavelengths from the ultraviolet through the infrared part of the spectrum. We have demonstrated photonic crystals that incorporate liquid crystals (LC), such as those used in LCD displays, that can selectively reflect a single wavelength within a narrow tuning range by reorientation of the LC molecules through transparent electrodes. We have also demonstrated photonic crystals that incorporate azobenzene molecules that undergo a rapid transformation when illuminated by a laser, to quickly move a reflected wavelength band from one wavelength to another. Devices with these capabilities are potentially useful for optical signal modulation in the telecommunication field, video display, and protection of sensors and eyes from lasers.
Follow the link below to learn more about our work with tunable optical modulators.
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 Research Areas
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