Graphene Optical Switch Based on Charge Transfer Plasmons. Issue 11 (22nd September 2017)

• Record Type: Journal Article
• Authors: Ahmadivand, Arash; Gerislioglu, Burak; Pala, Nezih
• Is Part Of: Physica status solidi. Volume 11:Issue 11(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-09-22
• Subjects: charge transfer plasmons -- gold dimer -- graphene plasmonics -- switching -- telecommunication band; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201700285
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : In the past decade, dynamic, tunable, compact, and fast plasmonic switches with high modulation depth (MD) and low losses have been developed successfully for various practical applications. Here, using a simple plasmonic dimer consisting of a pair of metallic nanodisks bridged to each other with a graphene monolayer, we develop a highly tunable plasmonic switch for telecommunication applications. We have shown that having active control on the photoconductivity of graphene sheet through electrical bias allows for transition of charges across the atomically thin bridge, giving rise to formation of charge transfer plasmon (CTP) modes. Such an interplay between semiconducting and semi‐metallic states of the graphene sublayer leads to direct control of the excited CTPs. By tuning the peak of CTP at the global telecommunication band ( λ = 1550 nm), we designed an integrated, fast, and functional optoelectronic nanoswitch with high MD up to ≈98% and negligible losses. This study presents a promising approach to design tunable, high‐quality, integrated optoelectronic switches for next‐generation advanced nanophotonic applications. Abstract : An ultra‐large modulation depth, efficient, fast, electrically tunable, and compact telecommunication optoelectronic switch is proposed for optical telecommunication applications. Tuning the photoconductivity of graphene sublayer allows for the excitation of functional charge transfer plasmon (CTP) peak in the near‐infrared regime. The gate‐tunable CTP extreme is appears and vanishes when the corresponding photoconductivity of graphene junction increases and decreases, respectively.