On‐demand photonic crystal resonators

Abstract

Recent progress in the field of re-locatable photonic crystal resonators is discussed with a particular emphasis on the flexible scheme that employs highly-curved microfiber. In this scheme a spectrally-tunable high-quality-factor resonator can be defined repeatedly by physically moving a curved microfiber to a new position. When a curved microfiber is placed on top of a photonic crystal waveguide (or photonic crystal), a photonic well is newly created in the vicinity of the contact point. Inside of this photonic well, high-quality-factor resonant modes are generated at frequencies below the cutoff edge of the guided mode. The tapered microfiber is an integral part of a single mode optical fiber and efficient out-coupling is naturally obtained. The sub-nanometer spectral tuning capability that is available by changing the curvature of the microfiber is also an important characteristic and discussed. This spectrally-and spatiallyreconfigurable photonic crystal resonator is expected to be a potential platform for photonic crystal based single photon sources, which enables accurate spatial overlap and spectral overlap with a single quantum dot, together with straightforward photon out-coupling to the fiber with high efficiency.

High-Q Optical Sensors for Chemical and Biological Analysis

“…Photonic crystal sensors generally have Q factors between 10 1 –10 3 , 46, 115, 116 although notable examples of high-Q photonic crystal geometries have been demonstrated recently with Q factors of 10 4 –10 7 . 117–119 Due to these recent improvements in Q factor and also the highly complementary advances in surface chemistry and assay methodology that are relevant to microcavity sensors, photonic crystal sensors and photonic-plasmonic hybrid devices are briefly introduced here.…”

In situ optofluidic control of reconfigurable photonic crystal cavities

“…A microfiber in contact with a PhC waveguide can induce a cavity by itself. 29 In the present experiments, there is no need for the permanent presence and accurately controlled position of the fiber, which can be withdrawn after the droplet is placed.…”

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

“…Curved-microfiber-coupled high-Q "reconfigurable PhC resonators" (RPCRs), which are relocatable and spectrally tunable, were proposed and demonstrated with an InGaAsP slab at wavelengths near 1550 nm [22][23][24]. In that scheme, the location of the PhC resonator can be defined repeatedly according to the contact of the microfiber.…”

“…In that scheme, the location of the PhC resonator can be defined repeatedly according to the contact of the microfiber. Furthermore, the spectral resonance and the coupling efficiency can be adjusted by changing the curvature of the curved microfiber [23,24].…”