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Materials 2017, 10(9), 1037; doi:10.3390/ma10091037

Metamaterial Waveguide Devices for Integrated Optics

1
Institute of Innovative Research (IIR), Tokyo Institute of Technology, Tokyo 152-8552, Japan
2
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, Tokyo 152-8552, Japan
*
Author to whom correspondence should be addressed.
Received: 1 August 2017 / Revised: 25 August 2017 / Accepted: 1 September 2017 / Published: 5 September 2017
(This article belongs to the Special Issue Advance in Plasmonics and Metamaterials)
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Abstract

We show the feasibility of controlling the magnetic permeability of optical semiconductor devices on InP-based photonic integration platforms. We have achieved the permeability control of GaInAsP/InP semiconductor waveguides by combining the waveguide with a metamaterial consisting of gate-controlled split ring resonators. The split-ring resonators interact magnetically with light travelling in the waveguide and move the effective relative permeability of the waveguide away from 1 at optical frequencies. The variation in permeability can be controlled with the gate voltage. Using this variable-permeability waveguide, we have built an optical modulator consisting of a GaInAsP/InP Mach–Zehnder interferometer for use at an optical communication wavelength of 1.55 μm. The device changes the permeability of its waveguide arm with controlling gate voltage, thereby varying the refractive index of the arm to modulate the intensity of light. For the study of variable-permeability waveguide devices, we also propose a method of extracting separately the permittivity and permeability values of devices from the experimental data of light transmission. Adjusting the permeability of optical semiconductors to the needs of device designers will open the promising field of ‘permeability engineering’. Permeability engineering will facilitate the manipulation of light and the management of photons, thereby contributing to the development of novel devices with sophisticated functions for photonic integration. View Full-Text
Keywords: metamaterials; integrated optics; III-V semiconductors metamaterials; integrated optics; III-V semiconductors
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Amemiya, T.; Kanazawa, T.; Yamasaki, S.; Arai, S. Metamaterial Waveguide Devices for Integrated Optics. Materials 2017, 10, 1037.

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