Efficient photon collection from reconfigurable photonic crystal slab resonator operating at short wavelengths

Abstract

The efficiency of photon collection from a reconfigurable photonic crystal (PhC) resonator through a curved microfiber is investigated by means of k-space analyses. We observed that efficient photon collection through the microfiber can be achieved when the PhC slab is thinner than 0.6a, where a is the lattice constant of the PhC. For thicker slabs, loss through the slab TM mode, which stems from the broken mirror symmetry of the slab, becomes significant. It was found that this TM-mode coupling can be suppressed considerably by reducing the thickness of the slab.

Dual-rail nanobeam microfiber-coupled resonator

“…Both the larger air hole and the narrower rail naturally contribute to the reduction of the effective index of the guided mode and the better index matching with the microfiber is achieved. More detailed k-space analyses of this coupling mechanism can be found in the Reference [22]. For switching devices employing Kerr nonlinearities, the large Q/V m is beneficial to obtain the high field intensity with lower incident power [1].…”

Direct fiber-coupled single photon source based on a photonic crystal waveguide

“…1(b). 24,25 There are two guided modes whose E y fields show different symmetries. The even guided mode has an electric field maximum at the center of waveguide, which encourages photons from quantum dots to couple into the waveguide mode efficiently.…”

“…[15][16][17]32,33 Theoretically, the coupling efficiency can be over 90% depending on the slab thickness. 25 The thinner slab allows the better coupling, but the thin slab causes fabrication difficulty. The discrepancy between the calculation and the measurement estimation is due to the fabrication imperfection of PhC and the tapered micro-fiber.…”