Volume 131, Number 5, September 2020
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||22 September 2020|
A tunable silicon-on-insulator valley Hall photonic crystal at telecommunication wavelengths
Received: 27 July 2020
Accepted: 19 August 2020
Silicon-on-insulator (SOI) combined with topological photonics provides on-chip integrated photonic devices CMOS-compatibility and backscattering-suppression. Here we propose a tunable SOI-based valley Hall topological insulator with two nonequivalent air holes to break inversion symmetry. Due to free-carrier excitation, the real and imaginary parts of the refractive index are modified to cause a blue-shift of bandgap and a reduction of transmittance, respectively. Based on this mechanism, we design a tunable all-optical switch with the merits of high transmittance contrast (about 23) and polarization-resolved characteristics simultaneously. Our proposed approach has potential in broadband tunable integrated photonic devices at telecommunication wavelengths.
PACS: 42.70.Qs – Photonic bandgap materials / 32.80.Xx – Level crossing and optical pumping / 42.79.Ta – Optical computers, logic elements, interconnects, switches; neural networks
© 2020 EPLA
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