Affiliation:
1. Chinese Academy of Sciences
2. University of Chinese Academy of Sciences
Abstract
Conventional spectrometers are bulky, and researchers have continuously made efforts in
their miniaturization and integration in recent years. Among these
studies, metalenses have attracted immense interest because of their
merits of a flat shape and flexible regulation. Herein, we introduce a
design of a polarization-insensitive metalens-based spectrometer that
utilizes an off-axis high-efficiency broadband metalens in the
wavelength range of 500–1000 nm. The demonstrated metalens
consisting of nanopillars employs propagation phase and phase function
optimization methods and can achieve spectral resolutions of
0.6 nm with efficiency as high as 77%. By stitching metalenses
with different focal lengths, the functionality of the spectrometer
can be expanded. Hence, a compact variable design with favorable
focusing and dispersive properties can be achieved by one single
component instead of traditional cascading optics, thus shrinking the
volume to the millimeter scale and reducing cost. This research proves
the potential for applications of metalenses in spectrometers as well
as other consumer and industry products.
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering