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| 1 | Doublet achromatic metalens for broadband optical retroreflector显示文摘A retroreflector that reflects light along its incident direction has found numerous applications in photonics, but the available metasurface schemes suffer from the issue of narrow bandwidth and/or a single angle of incidence. Here, a retroreflector using double layers of achromatic gradient metasurfaces is reported, which can realize retroreflection over a continuous range of incidence angles within a wide spectral band. The first metasurface serves as a transmissive achromatic lens that performs a broadband spatial Fourier transform and its inverse, while the second metasurface works as a reflective achromatic lens that undergoes wavelength-and position-dependent phase dispersions. Using this design strategy, a near-infrared retroreflector comprised of silicon nanopillars with the cross sections of square pillars and square holes is numerically demonstrated, providing a high-performance retroreflection for polarization-independent incident light waves over a continuous range of incidence angles from 0° to 16° within an extremely broad wavelength range between 1.35 and 1.95 μm. The scheme herein can offer a design strategy of broadband retroreflectors and impact numerous photonics applications. | 邓明 任唐轩 王健 陈林 | 2021 | Chinese Optics Letters2021，19，2： | 1 |
| 2 | Preface to the special issue on “Multi-Dimensional Light Field Manipulation: Methods and Applications”显示文摘Compared with electrons,there is one distinct feature of photons,known as multiple physical dimensions.Frequency/wavelength,time,complex amplitude and polarization are typical physical dimensions of photons.Very recently,the spatial structure of photons,the only known physical dimension left,has attracted increasing interest in full access of photons worthy of exploration.Manipulating these physical dimensions of photons enables a diversity of light related applications such as trapping,sensing,metrology,microscopy,imaging,quantum information processing and optical communications. | Jian WANG | 2019 | Frontiers of Optoelectronics2019，12，1： | 0 |
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