Abstract
Anti-reflection coatings (ARCs) from the cornea nipple array of the moth-eye remarkably suppress the Fresnel reflection at the interface in broadband wavelength ranges. ARCs on flat glass have been studied to enhance the optical transmittance. However, little research on the implementation of ARCs on curved optical lenses, which are the core element in imaging devices, has been reported. Here, we report double-sided, bio-inspired ARCs on bi-convex lenses with high uniformity. We theoretically optimize the nanostructure geometry, such as the height, period, and morphology, since an anti-reflection property results from the gradually changed effective refractive index by the geometry of nanostructures. In an experiment, the transmittance of an ARCs lens increases up to 10% for a broadband spectrum without distortion in spot size and focal length. Moreover, we demonstrate ~30% improved transmittance of an imaging system composed of three bi-convex lenses, in series with double-sided ARCs (DARCs).
Highlights
Nanostructured surfaces in nature feature multi-functionalities, such as self-cleaning of the lotus leaf, vivid color of butterfly wings, photoreception of brittlestars, and broadband antireflection of the moth-eye cornea [1,2,3,4,5]
The results suggest that the transmittance was improved by up to 30%, compared to the optical system without double-side antireflection coatings (DARCs)
The enhancement ratio was ratio was calculated by the DARCs peak intensity divided by the bare peak intensity, which displayed calculated by the DARCs peak intensity divided by the bare peak intensity, which displayed how the how the transmission at the center was more efficiently enhanced, up to 30%
Summary
Nanostructured surfaces in nature feature multi-functionalities, such as self-cleaning of the lotus leaf, vivid color of butterfly wings, photoreception of brittlestars, and broadband antireflection of the moth-eye cornea [1,2,3,4,5]. Owing to their intriguing features, these intelligent biological structures motivated the development of biomimetic engineering. The anti-reflection effect originated from a gradual change in the effective refractive index due to the tapered nanostructures in which the volume ratio changes continuously in a vertical direction [6]. Our designed optical system exhibits an enhanced transmittance of about 30%, and offers potential for higher optical performance in multi-lens imaging devices
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