PROJECT TITLE :

Lens-Less Coupling of Cavity-Resonator-Integrated Guided-Mode Resonance Filter

ABSTRACT:

A cavity-resonator-integrated guided-mode resonance filter (CRIGF) consists of a grating coupler (GC) and a combine of distributed-Bragg reflectors (DBRs) on a skinny-film dielectric waveguide, and provides a narrowband reflection spectrum for an incident small-diameter beam. A lens-less direct coupling of CRIGF to a single-mode optical fiber is theoretically and experimentally studied. A field-profile matching was discussed with alignment tolerance between CRIGF and the fiber. Design, fabrication, and characterization of CRIGF were described for an operation wavelength of 1540 nm. The aperture size and a nonuniform fill factors of the GC were investigated so as to comprehend high-efficiency coupling with an occurrence Gaussian beam of a 10.five-μm diameter. GeO2:SiO2 guiding core and Si-N cladding layers were deposited on a SiO2 glass substrate, and GC and DBRs were formed within the cladding layer by the electron-beam direct writing lithography. The lens-less direct coupling was demonstrated with wavelength selective coupling of the most potency of fifty% and full-width at [*fr1]-most of 1.three nm.