Photonics Research, 2018, 6 (1): 01000061, Published Online: Jul. 10, 2018
Two-groove narrowband transmission filter integrated into a slab waveguide Download: 561次
Wavelength filtering devices Microcavity devices Integrated optics devices Guided waves Resonance domain Subwavelength structures
Abstract
We propose a simple integrated narrowband filter consisting of two grooves on the surface of a slab waveguide. Spectral filtering is performed in transmission at oblique incidence due to excitation of an eigenmode of the structure localized at a ridge cavity between the grooves. For the considered parameters, zero reflectance and unity transmittance are achieved at resonant conditions. The width and location of the transmittance peak can be controlled by changing the widths of the grooves and of the ridge, respectively. The proposed filter may find application in waveguide-integrated spectrometers.
Leonid L. Doskolovich, Evgeni A. Bezus, Dmitry A. Bykov. Two-groove narrowband transmission filter integrated into a slab waveguide[J]. Photonics Research, 2018, 6(1): 01000061.