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【Hanmeng Li】
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Advanced Imaging
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Chinese Journal of Lasers B
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Optical Devices
Bandpass-filter-integrated multiwavelength achromatic metalens
Download:516次
Hanmeng Li
1,2†
Xingjian Xiao
1,2†
Bin Fang
1,2
Shenglun Gao
1,2
[ ... ]
Tao Li
1,2,*
Author Affiliations
Abstract
1
National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2
Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
The design of large-scale, high-numerical-aperture, and broadband achromatism is a big challenge in metalens research. In fact, many colorful imaging systems have RGB color filters, which means the achromatism only for RGB lights would be sufficient. Avoiding broadband achromatism is expected to greatly improve the working efficiency of metalenses. Nevertheless, a proper bandpass filter is necessary under a white light illumination in the metalens integrated imaging system. Here we propose a bandpass-filter-integrated multiwavelength achromatic metalens (
NA
=
0.2
), which is designed using a searching optimization algorithm to achieve the achromatism of RGB lights with high efficiencies. The bandpass filter is implemented by composite DBRs and defect layers, by which three desired wavelengths are selected out. The simulations and experiments on the filter-integrated metalens definitely show a good RGB achromatism. Further imaging experiments demonstrate a higher signal-to-noise ratio and resolution compared with the one without the filter. Our approach provides not only an RGB achromatic meta-imaging device but also a new route to access a highly efficient spectrum tailoring metasystem by incorporating bandpass filter designs.
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Photonics Research
2021, 9(7): 07001384
Research Articles
Metalens-integrated compact imaging devices for wide-field microscopy
Download:1054次
Beibei Xu
1,2†
Hanmeng Li
1,2
Shenglun Gao
1,2
Xia Hua
3
[ ... ]
Tao Li
1,2,*
Author Affiliations
Abstract
1
Nanjing University, College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Integration, Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing, China
2
Collaborative Innovation Center of Advanced Microstructures, Nanjing, China
3
Nanjing University, School of Electronic Science and Engineering, Nanjing, China
Metasurfaces have demonstrated unprecedented capabilities in manipulating light with ultrathin and flat architectures. Although great progress has been made in the metasurface designs and function demonstrations, most metalenses still only work as a substitution of conventional lenses in optical settings, whose integration advantage is rarely manifested. We propose a highly integrated imaging device with silicon metalenses directly mounted on a complementary metal oxide semiconductor image sensor, whose working distance is in hundreds of micrometers. The imaging performances including resolution, signal-to-noise ratio, and field of view (FOV) are investigated. Moreover, we develop a metalens array with polarization-multiplexed dual-phase design for a wide-field microscopic imaging. This approach remarkably expands the FOV without reducing the resolution, which promises a non-limited space-bandwidth product imaging for wide-field microscopy. As a result, we demonstrate a centimeter-scale prototype for microscopic imaging, showing uniqueness of meta-design for compact integration.
metalens
compact imaging device
polarization multiplexing
wide-field microscopy
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Advanced Photonics
2020, 2(6): 066004
Nonlinear Optics
Second-harmonic generation and manipulation in lithium niobate slab waveguides by grating metasurfaces
Download:715次
Bin Fang
1,2
Hanmeng Li
1,2
Shining Zhu
1,2
Tao Li
1,2,*
Author Affiliations
Abstract
1
National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Integration, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2
Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
Nonlinear optical processes in waveguides play important roles in compact integrated photonics, while efficient coupling and manipulations inside the waveguides still remain challenging. In this work, we propose a new scheme for second-harmonic generation as well as beam shaping in lithium niobate slab waveguides with the assistance of well-designed grating metasurfaces at
λ
=
1064
nm
. By encoding the amplitude and phase into the holographic gratings, we further demonstrate strong functionalities of nonlinear beam shaping by the metasurface design, including dual focusing and Airy beam generation. Our approach would inspire new designs in the miniaturization and integration of compact multifunctional nonlinear light sources on chip.
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Photonics Research
2020, 8(8): 08001296
Research Articles
Subwavelength self-imaging in cascaded waveguide arrays
Download:910次
Wange Song
1,2
Hanmeng Li
1,2
Shenglun Gao
1,2
Chen Chen
1,2
[ ... ]
Tao Li
1,2,*
Author Affiliations
Abstract
1
Nanjing University, College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Integration, Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing, China
2
Collaborative Innovation Center of Advanced Microstructures, Nanjing, China
Self-imaging is an important function for signal transport, distribution, and processing in integrated optics, which is usually implemented by multimode interference or diffractive imaging process. However, these processes suffer from the resolution limit due to classical wave propagation dynamics. We propose and demonstrate subwavelength optical imaging in one-dimensional silicon waveguide arrays, which is implemented by cascading straight and curved waveguides in sequence. The coupling coefficient between the curved waveguides is tuned to be negative to reach a negative dispersion, which is an analog to a hyperbolic metamaterial with a negative refractive index. Therefore, it endows the waveguide array with a superlens function as it is connected with a traditional straight waveguide array with positive dispersion. With a judiciously engineered cascading silicon waveguide array, we successfully show the subwavelength self-imaging process of each input port of the waveguide array as the single point source. Our approach provides a strategy for dealing with optical signals at the subwavelength scale and indicates functional designs in high-density waveguide integrations.
self-imaging
resolution limit
silicon waveguide array
photonic integration
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Advanced Photonics
2020, 2(3): 036001
Holography
Mode division multiplexed holography by out-of-plane scattering of plasmon/guided modes
Download:578次
Chenchen Zhao
Ji Chen
Hanmeng Li
Tao Li
*
Shining Zhu
Author Affiliations
Abstract
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
We design and demonstrate a type of multiplexed hologram by nanoscatterers inside a dielectric-loaded plasmonic waveguide with guided-wave illuminations. The mode division multiplexed hologram (MDMH) is fulfilled by the scattering of guided waves to free space with respect to different modes. According to different mode numbers, these guided modes have different responses to the multiplexed hologram, and then give rise to different holographic images in reconstructions. In experiments, we show two kinds of MDMHs based on
TM
0
/
TE
0
and
TE
0
/
TE
1
modes as examples. Our approach could enrich the holography method that favors on-chip integration.
090.4220
Multiplex holography
050.1970
Diffractive optics
PDF全文
Full Text
Chinese Optics Letters
2018, 16(7): 070901
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