Fig. 1: Ultra-high-Q on-chip microresonator and its mid-IR application examples.
From: A mid-infrared Brillouin laser using ultra-high-Q on-chip resonators
a Optical and scanning electron microscope (OM, SEM) images of the mid-IR ultra-high-Q (UHQ) resonator on a chip. The upper-left figure presents the concept of flip-chip coupling between the bus waveguide and the resonator. The SEM image on the right shows a cross-section of the fabricated multilayer UHQ resonator with false coloring for visibility. The lower figures show the OM and SEM images of the actual resonator with varying radii. b Schematic of cavity-enhanced light-matter interactions that can occur using UHQ mid-IR microresonators. c Examples of possible applications in nonlinear optics and molecular physics using the phenomena listed in b.
