We demonstrate that the wavelength sensitivity of a self-collimation superprism in photonic crystals (PhCs) can be greatly improved via slow light. With the help of a saddle point Van Hove singularity, we present an approach to obtain such a wavelength-sensitive self-collimation superprism. Our superprism not only has extremely high wavelength sensitivity, but also can suppress beam divergence, irregular beam generation, and wavelength channel dropout, overcoming the limitations of traditional PhC-based superprisms. Based on our superprism, a high-performance compact demultiplexer is also proposed.
© 2014 Optical Society of America
Original Manuscript: March 24, 2014
Revised Manuscript: May 23, 2014
Manuscript Accepted: June 25, 2014
Published: July 25, 2014
Wei Li, Xiaogang Zhang, Xulin Lin, and Xunya Jiang, "Enhanced wavelength sensitivity of the self-collimation superprism effect in photonic crystals via slow light," Opt. Lett. 39, 4486-4489 (2014)