Gas sensing with a high-quality-factor photonic crystal ring resonator
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
SPIE Optics + Optoelectronics
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
A design for a high Q factor photonic crystal ring resonator (PCRR) is presented. The PCRR is based on 2D pillar type
photonic crystals, which consist of a hexagonal array of silicon rods. The cavity is created by removing elements from
the regular PhC grid. Achieving strong confinement of light intensity in the low index region (filled with the gaseous
analyte) is the advantage of this PCRR. In that manner, the interaction of light and analyte, which can be a liquid or a
gas, will be enhanced. The high quality factor of the cavity (Q=1.2×10e4), along with strong overlap between the field of
the resonant mode and the analyte as well as the low group velocity of PCRR modes yield enhanced light-matter
interaction. An enhancement factor of 1.149×105 compared to the bulk light absorption in a homogenous material
provides the potential for highly sensitive gas detection with a photonic crystal ring resonator.