Highly efficient and ultra-broadband graphene oxide ultrathin lenses with three-dimensional subwavelength focusing
Year: 2015
Type: article
Abstract: Nanometric flat lenses with three-dimensional subwavelength focusing are indispensable in miniaturized optical systems. However, they are fundamentally challenging to achieve because of the difficulties in accurately controlling the optical wavefront by a film with nanometric thickness. Based on the unique and giant refractive index and absorption modulations of the sprayable graphene oxide thin film during its laser reduction process, we demonstrate a graphene oxide ultrathin (∼200 nm) flat lens that shows far-field three-dimensional subwavelength focusing (λ(3)/5) with an absolute focusing efficiency of >32% for a broad wavelength range from 400 to 1,500 nm. Our flexible graphene oxide lenses are mechanically robust and maintain excellent focusing properties under high stress. The simple and scalable fabrication approach enables wide potential applications in on-chip nanophotonics. The wavefront shaping concept opens up new avenues for easily accessible, highly precise and efficient optical beam manipulations with a flexible and integratable planar graphene oxide ultrathin film.
Source: Nature Communications
DOI: 10.1038/ncomms9433
Authors: Xiaorui Zheng, Baohua Jia, Han Lin, Ling Qiu, Dan Li, Min Gu
Institutions: Swinburne University of Technology, Monash University
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Funder: Australian Research Council
Awards: Refractive index manipulation in photonic bandgap materials for highly efficient far-field three-dimensional nonlinear nanofocusing, An accelerating journey to the new era of Petabyte optical memory systems, Investigation into a graphene ultra-flat lens array for silicon solar cells breaking the Shockley-Queisser efficiency limit
OpenAlex ID: W2227790815