Resonant waveguide device with vertical gratings

Abstract

Transmission resonant filters in a waveguide with vertical gratings have been realized in silicon on insulator wafers. Experimental studies of fabricated devices show a broad stopband of approximately 19 nm in the center of which exists a narrow transmission band of approximately 0.5 nm with a quality factor of approximately 3000. These resonant cavities are useful for laser cavities, switches, modulators, detectors, and tunable filters.

Design of compact IIIV/Si distributed feedback lasers

“…To measure coupling coefficient, we need to observe the wavelength-dependent transmission of the grating and fit the spectrum with the theoretical expression for transmission with coupling coefficient as a fitting parameter [8]. We couple the light from a tunable laser into straight waveguides containing the Bragg grating structures, and collect the output signal from the other end of the waveguide, sending the signal to a spectrum analyzer.…”

Novel resonant cavity-enhanced absorber structures for high-efficiency midinfrared photodetector application

“…In spite of these difficulties, it was shown that with proper design, the nearly 100% polarized guided-mode resonance reflectance spectrum can be broadened significantly [14][15][16] and made confluent at the same wavelength for the TE and TM polarizations. 14,17 The integration of a subwavelength grating as a wavelength tuning element with a DBR 18 and waveguide-based cavities 19 was reported. An air-bridge subwavelength grating reflector has been proposed 20,21 for using as a suspended top mirror in a vertical-cavity surface-emitting laser structure.…”

Silicon-based on-chip electrically tunable sidewall Bragg grating Fabry–Perot filter

“…Owing to the unique feature of a narrow transmission window within its stopband, a Bragg grating Fabry-Perot filter (BG-FPF) [1,2] has been considered a key photonic component that can find numerous applications such as narrowband filtering [3], optical sensing [4], and optical signal processing [5]. In addition, a BG-FPF with an ultra-narrow transmission window can also be used in a photonic subsystem for mode selection.…”