Optical super-resolution effect induced by nonlinear characteristics of graphene oxide films
Yong-chuang Zhao, Zhong-quan Nie, Ai-ping Zhai, Yan-ting Tian, Chao Liu, Chang-kun Shi, Bao-hua Jia
Optoelectronics Letters ›› , Vol. 14 ›› Issue (1) : 21-24.
Optical super-resolution effect induced by nonlinear characteristics of graphene oxide films
In this work, we focus on the optical super-resolution effect induced by strong nonlinear saturation absorption (NSA) of graphene oxide (GO) membranes. The third-order optical nonlinearities are characterized by the canonical Z-scan technique under femtosecond laser (wavelength: 800 nm, pulse width: 100 fs) excitation. Through controlling the applied femtosecond laser energy, NSA of the GO films can be tuned continuously. The GO film is placed at the focal plane as a unique amplitude filter to improve the resolution of the focused field. A multi-layer system model is proposed to present the generation of a deep sub-wavelength spot associated with the nonlinearity of GO films. Moreover, the parameter conditions to achieve the best resolution (∼λ/6) are determined entirely. The demonstrated results here are useful for high density optical recoding and storage, nanolithography, and super-resolution optical imaging.
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This work has been supported by the National Natural Science Foundation of China (Nos.61575139, 51602213 and 11604236), and the Young Science Foundation of Taiyuan University of Technology (No.2015QN066). This paper was recommended by the 9th International Conference on Information Optics and Photonics (CIOP 2017).
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