Abstract
Optical absorption of a guided light wave in a waveguide by a metal is undesirable in many photonic integrated devices. However, the heating due to the optical absorption enables to realize novel applications such as nonvolatile optical memories and all-optical thermo-optic devices. We report an efficient heating due to the optical absorption of an evanescent field by a metal heating layer deposited on a silicon microring resonator and consequent light-to-heat conversion. We investigate the design of the microring resonator by both theoretical and experimental approaches, which enable an efficient light-to-heat conversion. An enhanced thermo-optic effect by the optical absorption of the heating layer is observed. In addition, a heating efficiency larger than 40 K/mW is expected.
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