Compact long-wave infrared ring resonator for sensing applications

Surface polaritons have been shown to provide subwavelength confinement. Surface phonon polaritons (SPhPs), electromagnetic waves coupled to lattice vibrations in a polar dielectric, allow for highly confined propagating modes beyond the limit of diffraction within the mid to long infrared (IR). In recent years, it has been shown that hybrid plasmonic and phononic waveguides can support long-range hybrid modes that result from the coupling between SPhPs and a high index dielectric tracer. This work investigates the use of a hybrid phononic waveguide as a building block of a ring resonator that operates in the long wave infrared (LWIR) spectrum. Critical coupling condition and trade-off between ring diameter and output power are characterized. LWIR ring resonators hold promise for numerous applications including modulation, biosensing, photodetectors, and chemical sensing.

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