Spontaneous Pulse Formation in Edgeless Photonic Crystal Resonators
Su P. Yu, Daniel Cole, Hojoong Jung, Gregory Moille, Kartik Srinivasan, Scott Papp
Complex systems are a proving ground for fundamental interactions between components and their collective emergent phenomena. Through intricate design, integrated photonics offers intriguing nonlinear inter- actions that create new patterns of light. In particular, the canonical Kerr- nonlinear resonator becomes unstable with a sufficiently intense traveling-wave excitation, yielding instead a Turing pattern composed of a few interfering waves. They also support the localized soliton pulse as a separate nonlinear stationary state. Kerr solitons are remarkably versatile for applications, but they cannot emerge from continuous excitation. Here, we explore an edge-less photonic-crystal resonator (PhCR) that enables spontaneous formation of a soliton pulse in place of the Turing pattern. We design a PhCR in the regime of single-azimuthal-mode engineering to re-balance Kerr-nonlinear frequency shifts in favor of the soliton state, commensurate with how group- velocity dispersion balances nonlinearity. Our experiments establish PhCR solitons as mode-locked pulses by way of ultraprecise optical- frequency measurements, and we characterize their fundamental properties. Our work shows that deep sub- wavelength nanophotonic design expands the palette for nonlinear engineering of light.
, Cole, D.
, Jung, H.
, Moille, G.
, Srinivasan, K.
and Papp, S.
Spontaneous Pulse Formation in Edgeless Photonic Crystal Resonators, Nature, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929862
(Accessed March 5, 2024)