We present a design for spectral engineering in a metal dual distributed Bragg reflector (DBR)-based structure. Optical Tamm states and Fabry–Perot cavity mode, dual windows for light–matter interaction enhancement, can be excited simultaneously and tuned flexibly, including their respective bandwidth and resonant wavelength, due to the variable reflection phase from the outer DBR’s internal surface. The design can find applications in solar cells for light trappings. Via calculations of overall absorptivity, the proposed simpler dual-states-based scheme is demonstrated to be almost as effective as the coherent-light-trapping scheme, owing to the dual-states-induced broader-band absorption enhancement.
© 2013 Optical Society of America
Original Manuscript: September 13, 2013
Manuscript Accepted: October 2, 2013
Published: October 24, 2013
Xu-Lin Zhang, Jun-Feng Song, Jing Feng, and Hong-Bo Sun, "Spectral engineering by flexible tunings of optical Tamm states and Fabry–Perot cavity resonance," Opt. Lett. 38, 4382-4385 (2013)