Thermo-optic control of a topological boundary mode
Year: 2026
Type: article
Abstract: We investigate thermo-optic-induced delocalization of a topological mode in a 1D Su-Schreiffer-Heeger system with a domain wall possessing non-zero Zak phase of varying magnitudes. Thermal perturbations are applied to the domain wall, inducing a change in its local refractive index via the thermo-optic effect and causing a perturbation in the system’s chiral symmetry. The ultra-silicon-rich-nitride (USRN) material on which the device is implemented has a large thermo-optic coefficient of 2.48X10 −4 /°C, similar in magnitude to the refractive index variation caused by the third-order nonlinear Kerr effect (d n /d W = 1.2X10 −4 /W). We experimentally characterize the transmission properties of the topological waveguide and observe thermo-optic-induced changes owing to the perturbation of the topological mode. We further experimentally observe modulation of the idler generated using nonlinear parametric wavelength conversion induced by the thermo-optic effect.
Source: Optics Express
DOI: 10.1364/oe.583003
Institution: Agency for Science, Technology and Research
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7127963391