On-chip splicer for coupling light between photonic crystal and solid-core fibers

Abstract

We present a lithographically defined, ultra-high vacuum (UHV) compatible on-chip structure acting as a mechanical splicer that allows efficient injection of light from a conventional solid-core (SC) fiber to a hollow-core photonic crystal fiber (HCPCF) and vice versa. We report the observed coupling efficiencies for an assortment of solid-core fibers and a HCPCF with maximum efficiency between solid-core fiber and HCPCF of 93%.

Fabry-Pérot Cavity Formed with Dielectric Metasurfaces in a Hollow-Core Fiber

“…The fiber cavity was mounted onto a piece of silicon wafer with a lithographically defined clamping structure 19 and its transmission spectra was measured using the optical setup shown in Fig. 2d.…”

“…26 This fiber-based cavity also allows for the potential of on-chip integration by the use of lithographically fabricated mechanical structures forming fiber couplers. 19 With improved reflectivities of the fabricated membranes, a cavity with high singlephoton cooperativity 27 could be realized in the very near future 15…”

“…The tight confinement of photons over macroscopic distances in the HCPCF cavity, not available in confocal cavities, could potentially enable novel regimes of the recently demonstrated super-radiant lasers and spin-squeezing measurements, , as well as offer an alternative to tapered fibers in exploring multimode strong-coupling cavity quantum electrodynamics (cQED) systems . This fiber-based cavity also allows for the potential of on-chip integration by the use of lithographically fabricated mechanical structures forming fiber couplers …”

“…26 This fiber-based cavity also allows for the potential of on-chip integration by the use of lithographically fabricated mechanical structures forming fiber couplers. 19 With improved reflectivities of the fabricated membranes, a cavity with high single-photon cooperativity 27 could be realized in the very near future 15 and pave the way toward tantalizing new studies combining coherent control techniques of light propagation, such as slow light and light storage, with cQED phenomena in atomic ensembles. In particular, these perforated membranes can be designed as polarization selective mirrors 13,17 that reflect light with, for example, vertical polarization but transmit light polarized horizontally and such mirrors can then form polarization-selective cavities inside the HCPCF.…”

“…Spectral Measurements of the Cavity. The fiber cavity was mounted onto a piece of silicon wafer with a lithographically defined clamping structure 19 and its transmission spectra was measured using the optical setup shown in Figure 2d. The light from a Ti:Sapph laser is aligned onto the fiber core using a 10× microscope objective and the transmitted light is coupled into a single mode fiber (SMF) before being detected by a photodiode.…”