期刊
OPTICS EXPRESS
卷 24, 期 16, 页码 18024-18034出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.24.018024
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资金
- Air Force Office of Scientific Research (AFOSR) (MURI) [FA9550-12-1-0389]
- National Science Foundation [ECCS-1307948, 1541959]
- Charles Stark Draper Laboratory [SC001-0000000731]
- National Science Scholarship from A*STAR, Singapore
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1307948] Funding Source: National Science Foundation
We report the first demonstration of a mid-IR reflection-based flat lens with high efficiency and near diffraction-limited focusing. Focusing efficiency as high as 80%, in good agreement with simulations (83%), has been achieved at 45 degrees incidence angle at lambda = 4.6 mu m. The off-axis geometry considerably simplifies the optical arrangement compared to the common geometry of normal incidence in reflection mode which requires beam splitters. Simulations show that the effects of incidence angle are small compared to parabolic mirrors with the same NA. The use of single-step photolithography allows large scale fabrication. Such a device is important in the development of compact telescopes, microscopes, and spectroscopic designs. (C) 2016 Optical Society of America
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