Zhengqi Liu

Jiangxi Normal University

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Xiaoshan Liu

Jiangxi Normal University

Guiqiang Liu

Jiangxi Normal University

Guolan Fu

Jiangxi Normal University

Mulin Liu

First Affiliated Hospital of Bengbu Medical College

Zhengjie Cai

Shanghai Jiao Tong University

Ying Hu

Hefei University of Technology

Pingping Pan

Peng Cheng Laboratory

Yan Wang

Tianjin University

Jing Chen

Nanjing University

Gui-qiang Liu

Jiangxi Normal University

Cooperative Institutions

Jiangxi Normal University

Chinese Academy of Sciences

Nanjing University

Nanjing University of Posts and Telecommunications

Zhejiang University

Sichuan University

Harbin Institute of Technology

University of Chinese Academy of Sciences

Wuhan University

Collaborative Innovation Center of Advanced Microstructures

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Volume‐Enhanced Raman Scattering Detection of Viruses

Small (2019)

Xingang Zhang Xiao Zhang Changliang Luo Zhengqi Liu Yiyun Chen

Abstract Virus detection and analysis are of critical importance in biological fields and medicine. Surface‐enhanced Raman scattering (SERS) has shown great promise in small molecule and even single molecule detection, and can provide fingerprint signals of molecules. Despite the powerful detection capabilities of SERS, the size discrepancy between the SERS “hot spots” (generally, <10 nm) and viruses (usually, sub‐100 nm) yields poor detection reliability of viruses. Inspired by the concept of molecular imprinting, a volume‐enhanced Raman scattering (VERS) substrate composed of hollow nanocones at the bottom of microbowls (HNCMB) is developed. The hollow nanocones of the resulting VERS substrates serve a twofold purpose: 1) extending the region of Raman signal enhancement from the nanocone surface (e.g., surface “hot spots”) to the hollow area within the cone (e.g., volume “hot spots”)—a novel method of Raman signal enhancement, and 2) directing analyte such as viruses of a wide range of sizes to those VERS “hot spots” while simultaneously increasing the surface area contributing to SERS. Using HNCMB VERS substrates, greatly improved Raman signals of single viruses are demonstrated, an achievement with important implications in disease diagnostics and monitoring, biomedical fields, as well as in clinical treatment.

10.1002/smll.201805516

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Citations (191)

Continuous copper film structures with broadband optical transparency

Materials Letters (2014)

Zhengqi Liu Guiqiang Liu Xiaoshan Liu Shan Huang Mulin Liu

Opacity

Optical transparency

Transparent conducting film

10.1016/j.matlet.2014.10.025

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Citations (2)

Bypassing Desolvation Step Ensures Fast Intercalation Chemistry for Titanate-Based Capacitors Endured at -60℃

Mei‐Yan Sun Zhengqi Liu Bo Liu Fu‐Da Yu Yang Xia

10.2139/ssrn.4868921

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Citations (0)

Optical cavity-assisted broadband optical transparency of a plasmonic metal film

Nanotechnology (2015)

Zhengqi Liu Yi-you Nie Wen Yuan Xiaoshan Liu Shan Huang

We theoretically present a powerful method to achieve a continuous metal film structure with broadband optical transparency via introducing a dielectric Fabry-Pérot (FP) cavity. An incident optical field could be efficiently coupled and confined with the strong localized plasmons by the non-close-packed plasmonic crystal at the input part and could then become re-radiated output via the transmission channel supported by the dielectric cavity. The formed photonic-plasmonic system could therefore make the seamless metal film structure have a superior near-unity transparency (up to 97%) response and a broadband transparent spectrum with bandwidth >245 nm (with transmittance >90%) in the optical regime. The observed optical properties of the proposed structure can be highly tuned via varying the structural parameters. Based on the colloidal assembly method, the proposed plasmonic crystal can be fabricated in a large area. In addition, the achieved optical transparency can be retained in the extremely roughed metal film structure. Thereby, the findings could offer a feasible way to achieve a broadband transparent metal film structure and hold potential applications in transparent electrodes, touch screens and interactive electronics.

Optical transparency

10.1088/0957-4484/26/18/185701

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Citations (14)

Ultra-broadband perfect solar absorber by an ultra-thin refractory titanium nitride meta-surface

Solar Energy Materials and Solar Cells (2017)

Zhengqi Liu Guiqiang Liu Zhenping Huang Xiaoshan Liu Guolan Fu

Overlayer

10.1016/j.solmat.2017.12.033

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Citations (220)

High-Q Silicon-Based Metasurface Perfect Absorber via Geometrical Perturbation Assisted Resonances

IEEE Photonics Technology Letters (2024)

Xiaoshan Liu Shimei Song Xiangman Wu Zhengqi Liu

A multi-band high-

$Q$

silicon-based metasurface light absorber is demonstrated via introducing geometrical perturbation for excitation of multipolar resonances. The displacement perturbation enables the ultra-sharp and near-unity absorption bands, leading to a 30-fold increase of the spectral

$Q$

factor and 12-fold enhancement of the absorptance in comparison to that of the un-perturbed silicon resonators. Moreover, owing to the overlapping of the electrical and magnetic dipoles, and the co-existence of electrical quadrupole modes, a new sharp absorption peak with the

$Q$

factor up to 539.1 is obtained, paving a new insight on achieving narrowband absorption. These findings suggest new methods for manipulation in spectral lineshape and also hold wide applications in optoelectronic modulators and devices.

10.1109/lpt.2024.3371182

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Citations (1)

Robust double-spectral transparency of double mutually staggered plasmonic arrays sandwiched by two continuous metal films

Optics Communications (2014)

Ying Hu Gui-qiang Liu Zhengqi Liu Yuan-hao Chen Xiang-nan Zhang

Double layered

Extraordinary optical transmission

Plasmonic Nanoparticles

10.1016/j.optcom.2014.02.020

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Citations (6)

Metallic Metasurfaces for Light Absorbers

IEEE Photonics Technology Letters (2016)

Guolan Fu Xiaoshan Liu Zhenping Huang Jian Chen Zhengqi Liu

Multi-band light perfect absorption by all-metal resonant structure is of particular interest for applications in a wide variety of technologies. Here, we propose and demonstrate a new strategy for achieving multi-band light absorber based on the metallic sub-wavelength structure, which consists of a hexagonally packed nanoring-nanodisk composite array on an opaque metal substrate. By introducing asymmetry to the nanoring-nanodisk hybrid system, new absorption bands emerge. The optical properties are enabled by strong plasmon resonances of the metallic resonators and their near-field coupling effects. Designing such nanostructures is a promising route for all-metal multi-band light absorption platform, which can be used as absorption filters, photo-thermal therapy, multispectral thermal emitters, and plasmonic biosensors.

Nanoring

Opacity

Nanophotonics

10.1109/lpt.2016.2628728

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Citations (14)

Actively Tunable THz Absorber for Switchable Operations Between Different Absorption Behaviors

IEEE photonics journal (2022)

Shu Zong Yu Yao Guiqiang Liu Xiaoshan Liu Zhengqi Liu

Many previous VO ₂ -based perfect metamaterial absorbers can enhance light-matter interaction when VO ₂ is in metal phase but with weak light-matter interaction when VO ₂ is in insulator phase. In this work, an actively tunable terahertz (THz) absorber with the ability to switch between dual-band absorption and single ultra-narrowband absorption is theoretically proposed and numerically demonstrated. The electric dipole resonance, localized surface plasmon resonance, Fabry-Perot resonance and surface lattice resonance are utilized to enhance light-matter interaction. The simulation results show that an absorption peak has an absorptance of 98.6% and the Q -factor reaches 351.5 when vanadium dioxide (VO ₂ ) is in the insulating phase. Then, two absorption peaks with the absorptance of 96.2% and 99.5% are presented at 2.30 THz and 3.31 THz, respectively, when VO ₂ is in the metallic phase. To better understand the physical mechanisms of this absorber, the influence of parameters is further investigated. The proposed absorber with the dynamically tunable characteristic between such distinct states can pave numerous promising applications in sensing, imaging, active switch and modulator.

10.1109/jphot.2022.3222816

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Citations (3)

High-quality multispectral bio-sensing with asymmetric all-dielectric meta-materials

Journal of Physics D Applied Physics (2017)

Zhengqi Liu Guolan Fu Xiaoshan Liu Yi Liu Li Tang

We propose and demonstrate a strategy for achieving high-quality bio-sensing in an asymmetric all-dielectric meta-material (α-ADM), which can provide multispectral narrowband optical extinction with enhanced electromagnetic field and eventually paves a novel efficient sensing platform. High performance optical sensing with figure of merit (FoM) reaching 353 and spectral intensity change related FoM* exceeding 4700 is achieved in this lossless α-ADM platform, which is orders of magnitude larger than that of the metallic plasmonic sensors. In particular, due to the high sensitivity and complete extinction existed in the sharp spectrum, a remarkable spectral intensity change from a 'dark' state to a 'bright' state is obtained when the surrounding refractive index value is only varied slightly. Moreover, ultra-low detection limitation of the protein layer down to sub-nanometer thickness can be achieved. The sensing contrast ratio exceeding 34 dB is obtained for the sensor adsorbed with protein films, which suggests an ultra-high signal-to-noise ratio detection for this ultra-thin bio-molecule layer. In contrast to the traditional plasmonic sensors, these features lay a foundation for new sensing schemes based on the all-dielectric structures. The sensing performance including the spectral sensitivity and the detecting signal-to-noise ratio can hold the proposed α-ADM with applications in high-quality refractive index sensing and optical bio-sensing.

10.1088/1361-6463/aa6384

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Citations (15)