Interference-Enhanced Chirality-Reversible Dichroism Metalens Imaging using Nested Dual Helical Surfaces

Posted on 07.04.2021 - 15:07
Conventional chiral metalens based on helicoidal structures suffers from low energy efficiency and fixed chirality due to the extreme low conversion efficiency of cross circular polarization of helicity-matched structure. Here, we report on a high efficiency and chirality reversible metalens imaging using nested dual helical surfaces. The high efficiency chiral metalens was implemented by splitting one conventional helical surface into two nested helical surfaces with independently controlled parameters. When the relative orientation of the two nested helical surfaces were twisted at certain angles, the conversion efficiency of cross circular polarization (i.e., effective polarization component in imaging) can be significantly enhanced by one-order of magnitude due to constructive interference of the surface plasmonic polaritons between the two nested helical surfaces, and the chirality of the metalens can be reversed by manipulating the twist angle even though the helicity of surface is unchanged. Experimental verifications were performed using two-photon laser direct writing and the chiral imaging in the infrared wavelength range of 3~5 μm was obtained successfully based on lock-in thermography. The demonstration of the high efficiency and chirality reversible metalens provides a new way to enhance the chiral imaging efficiency and design possibility for practical applications.

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Wang, Chinhua; Wang, Chenqian (2021): Interference-Enhanced Chirality-Reversible Dichroism Metalens Imaging using Nested Dual Helical Surfaces. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5331281.v2
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