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【Shijun Ge】
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Advanced Imaging
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Light-matter Interaction
Microstructured fluorescence in liquid crystals with femtosecond laser excitation
Xia Meng
1
Ping Jin
1
Shijun Ge
2
Jiao Liu
1
[ ... ]
Yanqing Lu
2
Author Affiliations
Abstract
1
College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
2
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
3
State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
This study investigated direct fluorescence generation from a nematic liquid crystal (NLC) NJU-LDn-4 under femtosecond laser excitation. The absorption, transmittance, excitation, and emission spectra of the NLC were assessed. The relationship between the femtosecond pump power and fluorescence intensity was analyzed, revealing a quadratic increase and indicating that two-photon absorption (2PA) is the primary fluorescence mechanism. The LC microstructure was designed using photoalignment technology, allowing the generated fluorescence to reflect the corresponding structure. This research can establish a foundation for tunable LC microstructured fluorescence, with potential applications in fluorescence microscopy and optoelectronics.
liquid crystal
femtosecond laser
fluorescence
microstructure
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Chinese Optics Letters
2024, 22(3): 033801
Special Issue on Optical Metasurfaces: Fundamentals and Applications
Photo-reconfigurable and electrically switchable spatial terahertz wave modulator [Invited]
Hongguan Yu
Huacai Wang
Zhixiong Shen
Shina Tao
[ ... ]
Wei Hu
**
Author Affiliations
Abstract
College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
Spatial terahertz wave modulators that can arbitrarily tailor the electromagnetic wavefront are in high demand in nondestructive inspections and high-capacity wireless communications. Here, we propose a liquid crystal integrated metadevice. It modulates the terahertz wave based on the adjustable electromagnetically induced transparency analog when spatially changing the environmental refractive index. The functions of the device can be arbitrarily programmed via photo-reorienting the directors of liquid crystals with a digital micromirror device-based exposing system. The thin liquid crystal layer can be further driven by an electric field, and thus the function can be rapidly switched. Amplitude modulation and the lens effect are demonstrated with modulation depths over 50% at 0.94 THz.
terahertz
spatial terahertz wave modulator
metasurface
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Chinese Optics Letters
2023, 21(1): 010002
Research Articles
Liquid crystal integrated metalens with tunable chromatic aberration
Download:832次
Zhixiong Shen
1,2
Shenghang Zhou
1
Xinan Li
1
Shijun Ge
1,2
[ ... ]
Yanqing Lu
1,*
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 Manipulation, Collaborative Innovation Center of Advanced Microstructures, Nanjing, China
2
Jiangsu Industrial Technology Research Institute, Institute for Smart Liquid Crystals, Changshu, China
Overcoming chromatic aberrations is a vital concern in imaging systems in order to facilitate full-color and hyperspectral imaging. By contrast, large dispersion holds opportunities for spectroscopy and tomography. Combining both functions into a single component will significantly enhance its versatility. A strategy is proposed to delicately integrate two lenses with a static resonant phase and a switchable geometric phase separately. The former is a metasurface lens with a linear phase dispersion. The latter is composed of liquid crystals (LCs) with space-variant orientations with a phase profile that is frequency independent. By this means, a broadband achromatic focusing from 0.9 to 1.4 THz is revealed. When a saturated bias is applied on LCs, the geometric phase modulation vanishes, leaving only the resonant phase of the metalens. Correspondingly, the device changes from achromatic to dispersive. Furthermore, a metadeflector with tunable dispersion is demonstrated to verify the universality of the proposed method. Our work may pave a way toward active metaoptics, promoting various imaging applications.
active metalens
liquid crystals
chromatic aberration
imaging
terahertz
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Advanced Photonics
2020, 2(3): 036002
Detectors
Tunable terahertz filter based on alternative liquid crystal layers and metallic slats
Download:859次
Shijun Ge
1
Jiachen Liu
1
Peng Chen
1
Wei Hu
1,*
Yanqing Lu
1,2
Author Affiliations
Abstract
1
National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2
Email: yqlu@nju.edu.cn
We propose and demonstrate a pseudo Fabry–Pérot filter in the terahertz frequency range of 0.1–0.5 THz. It consists of alternative liquid crystal layers and metallic slats. Separate sharp resonant peaks are shown in the simulated transmission spectra, and their positions shift toward higher frequencies when the refractive index of liquid crystal decreases. The measured transmission spectra are consistent with corresponding simulations. Via thermally tuning the refractive index of the filled liquid crystal, the resonant transmission frequencies shift accordingly. The work supplies a novel design for tunable terahertz filters, which would play important roles in terahertz imaging, sensing, high speed communication, and security applications.
040.2235
Far infrared or terahertz
120.2230
Fabry-Perot
120.2440
Filters
160.3710
Liquid crystals
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Chinese Optics Letters
2015, 13(12): 120401
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