Actively controlled super-resolution using graphene-based structure.
A super-resolution (with λ/50 resolution ability at mid-infrared region) device that consists of a monolayer graphene sandwiched between two dielectric materials with two alternate chemical potentials in graphene (which can be obtained by alternately applying two biased voltages to graphene) is proposed and analyzed. When the subwavelength resolution is achieved, the graphene-based device can be viewed as an effective optical medium with alternate arrangement of positive and negative refractive indices. And the isofrequency dispersion curves of the effective optical medium have the hyperbolic form. Furthermore, the super-resolution at different desired frequencies can be reached by merely changing the chemical potentials of graphene. The proposed devices have potential applications in multi-functional material, real-time subwavelength imaging, and high-density optoelectronic components for using the abnormal diffraction feature.
Bo Han
BH
Cheng
Kai Jiun
KJ
Chang
Yung-Chiang
YC
Lan
Din Ping
DP
Tsai
D003198:Computer Simulation; D004560:Electricity; D006108:Graphite / Q000737:chemistry*; D055096:Optical Devices; D055620:Optical Phenomena; D013997:Time Factors
D006108:Graphite