Efficient manipulation of energy flow utilizing graphene plasmonic lens

The International Symposium on Photonics and Optoelectronics(SOPO 2014)——Efficient manipulation of energy flow utilizing graphene plasmonic lens photons are uncharged, it is still elusive to effectively control them by electrical means.In recent years, many metal-based plasmonic devices for subwavelength light management have been proposed theoretically and demonstrated. For example, plasmonic Luneburg lens and Eaton lens are experimentally demonstrated by tailoring the topology of a dielectric layer adjacent to the metal surface. Different from the metal-based plasmonic lenses, we propose a graphene-based self-focus (Selfoc) lens for manipulating the energy flow of graphene plasmonic (GP) waves in infrared regime. The proposed Selfoc lens can be used to focus and collimate GP waves that propagate along the graphene by appropriately tuning the external gate voltage. In addition, we investigate the dispersion of the proposed Selfoc lens. It is found that such a lens is dispersionless over a wide frequency range. To illustrate the application of the proposed lens, we demonstrate that the image transfer of two point sources separated by a distance of λ0/30 (λ0 is the incident wavelength in vacuum) can be realized on the graphene. The proposed graphene-based Selfoc lens can be flexibly tuned by controlling the external bias voltage and possesses high confinement of SPPs, which paves the way for effectively manipulating energy flow of light at nanoscale.

关键词： 能量流 石墨烯等离子体 亚波长光学 自聚焦透镜 The International Symposium on Photonics and Optoelectronics(SOPO 2014)

主讲人：A.P. Guoxi Wang 机构：Xi'an Institute of Optics and Precision Mechanics of CAS

时长：0:12:13 年代：2014年