Affiliation:
1. MOE Key Laboratory of Advanced Micro-Structured Materials
2. Tongji University
3. Shanghai Frontiers Science Center of Digital Optics
4. Fudan University
Abstract
Diffractive optical elements (DOEs) play an important role in modern
optical applications such as spectral and imaging systems, but it is
challenging to balance the diffraction efficiency with the working
bandwidth. The core issue is controlling the broadband dispersion of
all phase units to achieve achromatic 2π-phase modulation in the broadband
domain. Here, we demonstrate broadband DOEs utilizing multilayer
subwavelength structures with different materials, making it possible
to freely control the phase and phase dispersion of the structural
units on a much larger scale than monolayer structures. The desired
dispersion-control abilities arose due to a dispersion-cooperation
mechanism and vertical mode-coupling effects between the top and
bottom layers. An infrared design comprised of two vertically
concatenated TiO2 and Si nanoantennas separated by a SiO2 dielectric spacer layer was
demonstrated. It showed an average efficiency of over 70% in the
three-octave bandwidth. This work shows enormous value for broadband
optical systems with DOEs such as spectral imaging and
augmented reality.
Funder
National Natural Science Foundation of
China
Science and Technology Commission of
Shanghai Municipality
Shanghai Municipal Education
Commission
Russian Foundation for Basic
Research
China Postdoctoral Science
Foundation
Shanghai Pujiang Program
Fundamental Research Funds for the
Central Universities
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering
Cited by
1 articles.
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