Resonant filters in waveguides with vertical gratings have been realized on a silicon-on-insulator wafer. Two identical uniformly distributed Bragg reflectors with vertical gratings are separated by a quarter wavelength phase offset. Experimental studies show a broad stopband and a narrow transmission band which shifts with changing substrate temperature that is also illuminated by an external laser pump beam at 514-nm wavelength. Experimental results on a low-frequency thermal modulation using an external light source are also presented.
© 2007 IEEE
Hyo-Chang Kim, Kazuhiro Ikeda, and Yeshaiahu Fainman, "Tunable Transmission Resonant Filter and Modulator With Vertical Gratings," J. Lightwave Technol. 25, 1147-1151 (2007)