Scalable variable-index elasto-optic metamaterials for macroscopic optical components and devices
- Scalable variable-index elasto-optic metamaterials for macroscopic optical components and devices
- 강구민; 신동혁; 김준현; 김창욱; 배규영; 백승화; Yaroslav Urzhumov; David R. Smith; 김경식
- Issue Date
- Nature Communications
- VOL 8, NO 16090-8
- Optical metamaterials with an artificial subwavelength structure offer new approaches to implement advanced optical devices. However, some of the biggest challenges associated with the development of metamaterials in the visible spectrum are the high costs and slow production speeds of the nanofabrication processes. Here, we demonstrate a macroscale (>35mm) transformation-optics wave bender (293 mm(2)) and Luneburg lens (855 mm(2)) in the broadband white-light visible wavelength range using the concept of elasto-optic metamaterials that combines optics and solid mechanics. Our metamaterials consist of mesoscopically homogeneous chunks of bulk aerogels with superior, broadband optical transparency across the visible spectrum and an adjustable, stress-tuneable refractive index ranging from 1.43 down to nearly the free space index (similar to 1.074). The experimental results show that broadband light can be controlled and redirected in a volume of >10(5)lambda x 10(5)lambda x 10(3)lambda, which enables natural light to be processed directly by metamaterial-based optical devices without any additional coupling components.
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