We demonstrate integrated holographic grating filters, that can be designed toward any desired target spectrum. A straightforward design method transforms this target spectrum into a weak effective refractive index variation. The filters are implemented in high-contrast silicon-on-insulator by modulating the width of the shallow etched sides of a ridge waveguide. Measurements show that this is a promising approach to integrate flexible and versatile filters on photonic chips to enable more complex applications.
© 2013 Optical Society of America
Diffraction and Gratings
Original Manuscript: November 26, 2012
Revised Manuscript: January 7, 2013
Manuscript Accepted: January 7, 2013
Published: February 1, 2013
Marie Verbist, Dries Van Thourhout, and Wim Bogaerts, "Weak gratings in silicon-on-insulator for spectral filters based on volume holography," Opt. Lett. 38, 386-388 (2013)