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Physical principle: Read more about the physics behind this here.
Citation for this work: “Scalable high-precision tuning of photonic resonators by resonant cavity-enhanced photoelectrochemical etching,” E. Gil-Santos, C. Baker, A. Lemaître, C. Gomez, G. Leo, and I. Favero, Nature Communications, vol. 8, p. 14267, Jan. 2017.
Keywords: Integrated waveguide, cavity optomechanics, optomechanical arrays, optomechanical networks, PEC, Photoelectrochemical etching, tuning of on-chip whispering gallery mode resonators, high-precision wavelength tuning.