Photonics Research, 2014, 2 (3): 03000A34, Published Online: Nov. 5, 2014
Graphene-based optical phase modulation of waveguide transverse electric modes Download: 1661次
Abstract
In this paper we report TE-mode phase modulation obtained by inducing a capacitive charge on graphene layers embedded in the core of a waveguide. There is a biasing regime in which graphene absorption is negligible but large index variations can be achieved with a voltage–length product as small as VπLπ~0.07 V cm for straight waveguides and VπLπ~0.0024 V cm for 12 μm radius microring resonators. This phase modulation device uniquely enables a small signal amplitude <1 V with a micrometer-sized footprint for compatibility with CMOS circuit integration. Examples of phase-induced changes are computed for straight waveguides and for microring resonators, showing the possibility of implementing several optoelectronic functionalities as modulators, tunable filters, and switches.
Michele Midrio, Paola Galli, Marco Romagnoli, Lionel C. Kimerling, Jurgen Michel. Graphene-based optical phase modulation of waveguide transverse electric modes[J]. Photonics Research, 2014, 2(3): 03000A34.