Journal
NANO LETTERS
Volume 16, Issue 7, Pages 4595-4600Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01897
Keywords
Metasurface; off-axis meta-lens; chiral imaging; multispectral; dispersive elements
Categories
Funding
- Air Force Office of Scientific Research (MURI) [FA9550-14-1-0389, FA9550-16-1-0156]
- Charles Stark Draper Laboratory, Inc. [SC001-0000000959]
- Thorlabs Inc.
- Ministry of Science and Technology, Taiwan [104-2917-I-564-058]
- Harvard SEAS
- A*STAR Singapore under National Science Scholarship
- Charles Stark Draper Fellowship
- National Science Foundation under NSF [1541959]
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The vast majority of biologically active compounds, ranging from amino acids to essential nutrients such as glucose, possess intrinsic handedness. This in turn gives rise to chiral optical properties that provide a basis for detecting and quantifying enantio-specific concentrations of these molecules. However, traditional chiroptical spectroscopy and imaging techniques require cascading of multiple optical components in sophisticated setups. Here, we present a planar lens with an engineered dispersive response, which simultaneously forms two images with opposite helicity of an object within the same field-of-view. In this way, chiroptical properties can be probed across the visible spectrum using only the lens and a camera without the addition of polarizers or dispersive optical devices. We map the circular dichroism of the exoskeleton of a chiral beetle, Chrysina gloriosa, which is known to exhibit high reflectivity of left-circularly polarized light, with high spatial resolution limited by the numerical aperture of the planar lens. Our results demonstrate the potential of metasurfaces in realizing a compact and multifunctional device with unprecedented imaging capabilities.
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