Micromechanical Fabrication of Resonator Waveguides Integrated Four‐Port Photonic Circuit from Flexible Organic Single Crystals

Abstract

By using a mechanophotonics approach, three flexible organic microcrystals of (E)-1-(4-(dimethylamino)-phenyl)iminomethyl-2-hydroxyl-naphthalene (DPIN) are micromanipulated, and dual-waveguides coupled ring resonator is fabricated. The flexibility of the DPIN crystal arises owing to its spring-like expansion and contraction of π∙∙∙π stacked molecular chains along the (002) plane. The crystals also act as optical waveguides in straight and bent geometries with very low optical loss coefficients. The fluorescence (FL) spectra of the guided light also display Fabry-Pérot modes. Precise mechanical manipulation of microcrystals with atomic force microscopy cantilever tip bent a straight crystal waveguide to 360° angle forming a ring-shaped crystal resonator (diameter ≈58.6 µm). The positioning and integration of two straight parallelly oriented waveguiding crystals (bus and drop) along the opposite edge of the ring resonator forms the first of its kind all-organic crystal-based dual-waveguides coupled ring resonator. The fabricated circuit with four ports selectively guides the produced input FL to through and drop ports via active, passive waveguiding and FL reabsorbance mechanisms.