Title :
Concept of multiorder multimode resonant optical filters
Author :
Liu, Z.S. ; Magnusson, R.
Author_Institution :
Dept. of Electr. Eng., Texas Univ., Arlington, TX, USA
Abstract :
The idea of implementing optical filters by coupling evanescent waves from several diffracted orders into multiple leaky waveguide modes is studied theoretically. Using a dielectric thin-film structure consisting of a coupling grating placed between adjacent waveguides, guided-mode resonance filters exhibiting multiple reflection peaks within a specified wavelength range can be obtained. These peaks originate in the resonant waveguide modes that are excited by the diffracted waves dispersed by the grating. It is shown that this device can be used to realize multiwavelength as well as wide-band spectral filters.
Keywords :
band-stop filters; dielectric thin films; diffraction gratings; optical couplers; optical films; optical waveguide filters; coupling grating; dielectric thin-film structure; diffracted orders; diffracted waves; evanescent wave coupling; grating; guided-mode resonance filters; multiorder multimode resonant optical filters; multiple leaky waveguide modes; multiple reflection peaks; multiwavelength filters; resonant waveguide modes; wavelength range; wide-band spectral filters; Dielectric thin films; Diffraction gratings; Optical coupling; Optical diffraction; Optical filters; Optical reflection; Optical waveguide theory; Optical waveguides; Resonance; Wideband;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2002.1021979
