Tunable tapered waveguide for efficient compression of light to graphene surface plasmons

Bo Han Cheng, Hong Wen Chen, Yi Jun Jen, Yung Chiang Lan, Din Ping Tsai

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Dielectric-graphene-dielectric (DGD) structure has been widely used to construct optical devices at infrared region with features of small footprint and low-energy dissipation. The optical properties of graphene can be manipulated by changing its chemical potential by applying a biased voltage onto graphene. However, the excitation efficiency of surface wave on graphene by end-fire method is very low because of large wavevector mismatch between infrared light and surface wave. In this paper, a dielectric-semiconductor-dielectric (DSD) tapered waveguide with magnetic tunability for efficient excitation of surface waves on DGD at infrared region is proposed and analyzed. Efficient excitation of surface waves on DGD with various chemical potentials in graphene layer and incident frequencies can be attained by merely changing the external magnetic field applied onto the DSD tapered waveguide. The electromagnetic simulations verify the design of the proposed structure. More importantly, the constituent materials used in the proposed structure are available in nature. This work opens the door toward various applications in the field of using surface waves.

Original languageEnglish
Article number28799
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Jun 29

All Science Journal Classification (ASJC) codes

  • General

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