Ultra-Compact Photonic Circuit Components Based on Propagation of Exciton Polaritons in Organic Dye Nanofibers

We fabricated a micron-sized ring resonator channel drop filter by micromanipulation of nanofibers of thiacyanine dye that propagate exciton polaritons along the fibers. The device consisted of a microring with a radius of r approximate to 4 mu m and a straight nanofiber that functioned as an I/O bus channel. The performance of the device was evaluated using spatially resolved fluorescence microscopy. The device exhibited an extinction ratio of r(e) = 2-4 dB for the visible wavelength region of 490-540 nm. Our results demonstrate that thiacyanine nanofibers are promising building blocks for exciton polariton-based photonic circuits, which can be highly miniaturized compared with conventional waveguide-based photonic circuits.