Abstract

Thermo-optic (TO) modulators with the ability of working from the visible to the infrared spectrum are promising for many emerging applications. However, current technologies suffer from either a limited operating spectrum range or weak TO effect. In this work, we present an effective TO modulator based on a titanium dioxide TiO₂ micro-ring resonator with solgel SiO₂ as the cladding. Taking advantage of the large negative TO coefficients of TiO₂ and solgel SiO₂, the fabricated device demonstrates a temperature-dependent wavelength shift of 58.3 pm/°C and a π-shift power consumption of 7.8 mW. Since both TiO₂ and solgel SiO₂ have a broad transmission window, the demonstrated device will have wide applications in integrated optics from the visible to the infrared wavelength range.

© 2022 Optica Publishing Group

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