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Design of electro-optic modulators and switches based on graphene and phase change materials
Author(s): Rajib R. Ghosh; Priyanka Bhardwaj; Senthil Subramanian; Mangesh Jaiswal; Anuj Dhawan
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Paper Abstract

We present the design and modeling of novel electro-optic modulators and switches that have large extinction ratios, such that these electro-optic modulators and switches operate at the optical communication wavelength range (around 1550 nm). Firstly, we describe the design of an electro-optic modulator based on a tunable slotted ring resonator, having two pairs of partially overlapping graphene layers above and below of the slotted ring (in some portion of the circumference). We demonstrate that the transmission of light through the through port can be modulated by the application of voltage across the graphene layers. Secondly, we discuss the design of electro-optic switches using phase change materials either in a micro disk resonator or in a photonic crystal slab waveguide. These devices are based on the shift in the resonant frequency of a micro disk resonator and on the shift in the photonic bandgap of the photonic crystal slab waveguide, respectively, when its refractive index changes upon the application of voltage across the phase change material. A three dimensional finite-difference time-domain modeling software (Lumerical FDTD) was used for optical modeling and a commercial device modeling software (Lumerical DEVICE) was for the electrical modeling. The proposed electro-optic modulators and electro-optic switches can be used in optoelectronics, as well in the telecom wavelength range.

Paper Details

Date Published: 26 April 2019
PDF: 9 pages
Proc. SPIE 11031, Integrated Optics: Design, Devices, Systems, and Applications V, 110311F (26 April 2019); doi: 10.1117/12.2524933
Show Author Affiliations
Rajib R. Ghosh, Indian Institute of Technology Delhi (India)
Priyanka Bhardwaj, Indian Institute of Technology Delhi (India)
Senthil Subramanian, Indian Institute of Technology Delhi (India)
Mangesh Jaiswal, Indian Institute of Technology Delhi (India)
Anuj Dhawan, Indian Institute of Technology Delhi (India)


Published in SPIE Proceedings Vol. 11031:
Integrated Optics: Design, Devices, Systems, and Applications V
Pavel Cheben; Jiří Čtyroký; Iñigo Molina-Fernández, Editor(s)

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