Fig. 5. Microring resonators and waveguides, as well as demonstration of their functionality.

a–c SEM images of a microring resonator with a diameter of 100 μm on a PMMA substrate. d Magnified view of the coupling waveguide, from which the surface smoothness can be seen. e Magnified SEM image of the microring resonator. A gap distance of approximately 370 nm was achieved between the resonator and waveguide. f SEM image of the cross-sectional view of a cleaved waveguide. The waveguide has a width of 4.3 μm and a height of 3.5 μm. g Microscope image of light propagation in a microring resonator when coupled by a laser beam at 633 nm. h Microscope image of polymeric waveguides made of OrmoCore embedded with CdSe/CdS core-shell type quantum rods and illuminated by a blue laser diode at 450 nm.