Cavity-resonator-integrated guided-mode resonance filter in channel waveguide

Abstract

A cavity-resonator-integrated guided-mode resonance filter (CRIGF) consisting of a grating coupler and a pair of distributed Bragg reflectors in a channel waveguide is proposed for a narrow-band reflection spectrum with a small aperture. A channel waveguide structure and grating pattern of the device were simultaneously formed by the electron-beam direct-writing lithography. A full-width at half-maximum of reflection spectrum of the fabricated CRIGF was about 0.3 nm with the maximum reflectance of about 30%. A reflection phase varied by almost 2% for wavelength change of 1 nm.

Design of guided-mode resonance mirrors for short laser cavities

“…Strong wavelength dependence of its reflection phase is also a remarkable feature of a GMRF [10] and a CRIGF [24]. When this dependence is obtained with high reflectance, it may provide an interesting external mirror for a short-cavity laser system.…”

“…A cavity-resonator-integrated guided-mode-resonance filter (CRIGF) consisting of a GC and a pair of distributed Bragg reflectors (DBRs) was proposed and investigated for reducing the coupling length of GCs [21,22]. There have been reports on various configurations including curved gratings [23], a channel waveguide [24], a nonuniform coupling coefficient [25], and twodimensionally crossed gratings [26]. Applications to external mirrors were reported for wavelength stabilization of a laser [27] and for wide acceptable incidence angle [28,29].…”

Cavity-resonator-integrated guided-mode resonance filter with several grating lines in aperture

“…A CRIGF consists of a GC acting as an aperture and a pair of distributed Bragg reflectors (DBRs) constructing a waveguide cavity resonator, and its operation principle has been confirmed experimentally [9][10][11]. We have fabricated 10-μm-aperture CRIGFs by using curved DBRs [12] or a channel structure [13] for lateral confinement of guided waves, and have also demonstrated direct coupling to an SMF [14]. In this work, we present a CRIGF with a micrometer-size aperture, which would be applicable to direct coupling with a high-NA SMF.…”

A modified INBC for FDTD analyzing of shielding cavity with thin conductive layers under plane wave incidence

“…To overcome this problem, the impedance network boundary conditions (INBCs) and other similar methods have been developed [2,3,4,5,6,7,8]. It uses equivalent transfer functions to describe the relationship of tangential field components on two surfaces of the TCL and the inner structure needs no longer to be modeled in FDTD.…”