Patent ID: 7952772

Claim:
A photonic crystal fiber resonator comprising: a solid region; and a cladding surrounding an exterior of the solid region, the cladding comprising at least one hollow channel configured to receive a fluid from an external source, the fluid may contain a quantity of an analyte, wherein the photonic crystal fiber has a coil section having at least one turn, the photonic crystal fiber has two ends configured to be in optical communication with each other, the solid region is configured to guide a substantially single optical mode of light that extends into the at least one hollow channel containing the fluid, the photonic crystal fiber resonator is configured to pass the substantially single optical mode of light through the at least one hollow channel containing the fluid multiple times, the photonic crystal fiber resonator is configured to resonate a first resonance signal when the substantially single optical mode of light is frequency-scanned through a region about a resonance frequency if a measurable quantity of the analyte absent from the fluid and resonate a second resonance signal other than the first resonance signal when the substantially single optical mode of light is frequency-scanned through the region about the resonance frequency if the measurable quantity of the analyte is present in the fluid.