检索结果-南通市图书馆

Chinese Physics B 2017年第2期26卷 213-217页

作者： Ru Wang Xiangxian Wang Hua Yang yunping qi School of Science Lanzhou University of Technology Lanzhou 730050 China College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China

This paper presents the theoretical investigation of hierarchical sub-wavelength photonic structures with various periods and numbers of layers, which were fabricated using a high-order waveguide-mode interference field. A 442-nm laser was used to excite high-order waveguide modes in an asymmetric metal-cladding dielectric waveguide structure. The dispersion curve of the waveguide modes was theoretically analyzed, and the distribution of the interference field of high-order waveguide modes was numerically simulated using the finite-element method. The various dependences of the characteristics of hierarchical sub-wavelength photonic structures on the thickness and refractive index of the photoresist and the waveguide mode were investigated in detail. These hierarchical sub-wavelength photonic structures have various periods and numbers of layers and can be fabricated by a simple and low-cost method.

关键词： sub-wavelength photonic structure finite-element method waveguide modes lithography

Plasmonic sensor with self-reference capability based on functional layer film composed of Au/Si gratings

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第1期31卷 293-298页

作者： Jiankai Zhu Xiangxian Wang yunping qi Jianli Yu School of Science Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China School of Electronic Engineering Chaohu UniversityChaohu 238000China

We propose a simple one-dimensional grating coupling system that can excite multiple surface plasmon resonances for refractive index(RI)sensing with self-reference characteristics in the near-infrared *** theoretical analysis and the finite-difference time-domain method,the plasmonic mechanism of the structure is discussed in *** results show that the excited resonances are independent of each other and have different fields of *** mode involving extensive interaction with the analyte environment achieves a high sensitivity of 1236 nm/RIU,and the figure of merit(FOM)can reach 145 ***,the mode that is insensitive to the analyte environment exhibits good self-reference ***,we discuss the case of exchanging the substrate material with the analyte *** simulation results show that this RI sensor can be widely deployed in unstable and complicated environments.

关键词： self-reference plasmonic sensor functional layer sensitivity

Efficient manipulation of terahertz waves by multi-bit coding metasurfaces and further applications of such metasurfaces

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第2期30卷 336-343页

作者： yunping qi Baohe Zhang Jinghui Ding Ting Zhang Xiangxian Wang Zao Yi College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China School of Science Lanzhou University of TechnologyLanzhou 730050China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621900China

Benefiting from the unprecedented superiority of coding metasurfaces at manipulating electromagnetic waves in the microwave band,in this paper,we use the Pancharatnam-Berry(PB)phase concept to propose a high-efficiency reflectivetype coding metasurface that can arbitrarily manipulate the scattering pattern of terahertz waves and implement many novel *** optimizing the coding sequences,we demonstrate that the designed 1-,2-,and 3-bit coding metasurfaces with specific coding sequences have the strong ability to control reflected terahertz *** two proposed1-bit coding metasurfaces demonstrate that the reflected terahertz beam can be redirected and arbitrarily *** normally incident x-and y-polarized waves,a 10 d B radar cross-section(RCS)reduction can be achieved from 2.1 THz to5.2 THz using the designed 2-bit coding ***,two kinds of orbital angular momentum(OAM)vortex beams with different moduli are generated by a coding metasurface using different coding *** research provides a new degree of freedom for the sophisticated manipulation of terahertz waves,and contributes to the development of metasurfaces towards practical applications.

关键词： coding metasurface Pancharatnam-Berry phase multiple beams radar cross-section(RCS)reduction orbital angular momentum

Independently tunable dual resonant dip refractive index sensor based on metal–insulator–metal waveguide with Q-shaped resonant cavity

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第3期31卷 316-322页

作者： Haowen Chen yunping qi Jinghui Ding Yujiao Yuan Zhenting Tian Xiangxian Wang College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China School of Science Lanzhou University of TechnologyLanzhou 730050China Engineering Research Center of Gansu Province for Intelligent Information Technology and Application Northwest Normal UniversityLanzhou 730070China

A plasmonic resonator system consisting of a metal–insulator–metal waveguide and a Q-shaped resonant cavity is proposed in this paper. The transmission properties of surface plasmon polaritons in this structure are investigated by using the finite difference in time domain(FDTD) method, and the simulation results contain two resonant dips. The physical mechanism is studied by the multimode interference coupled mode theory(MICMT), and the theoretical results are in highly consistent with the simulation results. Furthermore, the parameters of the Q-shaped cavity can be controlled to adjust the two dips, respectively. The refractive index sensor proposed in this paper, with a sensitivity of 1578 nm/RIU and figure of merit(FOM) of 175, performs better than most of the similar structures. Therefore, the results of the study are instructive for the design and application of high sensitivity nanoscale refractive index sensors.

关键词： surface plasmon polaritons refractive index sensors metal–insulator–metal(MIM)waveguide multi-mode interference coupling theory

A novel plasmonic refractive index sensor based on gold/silicon complementary grating structure

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第2期30卷 313-318页

作者： Xiangxian Wang Jiankai Zhu Yueqi Xu yunping qi Liping Zhang Hua Yang Zao Yi School of Science Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China Joint Laboratory for Extreme Conditions Matter Properties Southwest University of Science and TechnologyMianyang 621010China

A novel complementary grating structure is proposed for plasmonic refractive index sensing due to its strong resonance at near-infrared *** reflection spectra and the electric field distributions are obtained via the finite-difference time-domain *** simulation results show that multiple surface plasmon resonance modes can be excited in this novel ***,one of the resonance modes shows appreciable potential in refractive index sensing due to its wide range of action with the environment of the *** optimizing the grating geometric variables of the structure,the designed structure shows the stable sensing performance with a high refractive index sensitivity of 1642 nm per refractive index unit(nm/RIU)and the figure of merit of 409 RIU^(-1).The promising simulation results indicate that such a sensor has a broad application prospect in biochemistry.

关键词： plasmonic sensor gold silicon grating

A theoretical study of a plasmonic sensor comprising a gold nano-disk array on gold film with a SiO_2 spacer

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第4期28卷 184-189页

作者： Xiangxian Wang Jiankai Zhu Huan Tong Xudong Yang Xiaoxiong Wu Zhiyuan Pang Hua Yang yunping qi School of Science Lanzhou University of Technology College of Physics and Electronic Engineering Northwest Normal University

A plasmonic refractive index(RI) sensor with high RI sensitivity based on a gold composite structure is *** composite structure is constructed from a perfect gold nano-disk square array on a gold film, with a SiO_2 spacer. The reflection spectra of the composite structure, with analyte RI in the range of 1.30 to 1.40, are theoretically studied using the finite-difference time-domain method. The incident light beam is partly coupled to the localized surface plasmons(LSP) of the single nano-disks and partly transferred to the propagating surface plasmons(PSP) by grating coupling. The reflectivity is nearly zero at the valley of the reflection spectrum because of the strong coupling between LSP and PSP. Also, the full width at half maximum(FWHM) of one of the surface plasmon polaritons(SPPs) modes is very narrow, which is helpful for RI sensing. An RI sensitivity as high as 853 nm/RIU is obtained. The influence of the structure parameters on the RI sensitivity and the sensor figure of merit(FOM) are investigated in detail. We find that the sensor maintains high RI sensitivity over a large range of periods and nano-disk diameters. Results of the theoretical simulation of the composite structure as a plasmonic sensor are promising. Thus, this composite structure could be extensively applied in the fields of biology and chemistry.

关键词： plasmonic sensor refractive index sensitivity FOM

Ultra wide sensing range plasmonic refractive index sensor based on nano-array with rhombus particles

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第11期29卷 330-335页

作者： Jiankai Zhu Xiangxian Wang Xiaoxiong Wu Yingwen Su Yueqi Xu yunping qi Liping Zhang Hua Yang School of Science Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China

We propose a two-dimensional metal grating with rhombus particles on a gold film structure for refractive index sensing due to its perfect absorption at near-infrared *** two-dimensional metal grating coupling,the incident light energy is effectively transformed into the surface plasmons which propagate along the upper surface of the gold film and interact with the surrounding environment in a wide *** plasmonic resonance mechanism of the structure is discussed in detail by theoretical analysis and finite-difference time-domain *** optimizing the geometrical parameters,the designed structure shows the sensing performance with a refractive index sensitivity of 1006 nm/*** importantly,this plasmonic refractive index sensor achieves an ultra wide refractive index sensing range from 1.0 to 2.4 with a stable sensing *** promising simulation results of the structure show that the sensor has a broad application prospect in the field of biology and chemistry.

关键词： plasmonic sensor refractive index sensitivity figure of merit(FOM)

Refractive Index Sensor Based on Fano Resonances in Plasmonic Waveguide With Dual Side-Coupled Ring Resonators

在线全文

学校读者我要写书评

暂无评论

Photonic Sensors 2018年第4期8卷 367-374页

作者： Xuewei ZHANG yunping qi Peiyang ZHOU Hanhan GONG Bingbing HU Chunman YAN Engineering Research Center of Gansu Province for Intelligent Information Technology and Application College ofPhysics and Electronic Engineering Northwest Normal University Lanzhou 730070 China

A refractive index sensor based on Fano resonances in metal-insulator-metal （MIM） waveguides coupled with rectangular and dual side rings resonators is proposed. The sensing properties are numerically simulated by the finite element method （FEM）. For the interaction of the narrow-band spectral response and the broadband spectral response caused by the side-coupled resonators and the rectangular resonator, respectively, the transmission spectra exhibit a sharp and asymmetric profile. Results are analyzed using the coupled-mode theory based on the transmission line theory. The coupled mode theory is employed to explain the Fano resonance effect. The results show that with an increase in the refractive index of the fill dielectric material in the slot of the system, the Fano resonance peak exhibits a remarkable red shift. Through the optimization of structural parameters, we achieve a theoretical value of the refractive index sensitivity （S） as high as 1160 nm/RIU, and the corresponding sensing resolution is 8.62 × 10 -5 RIU. In addition, the coupled MIM waveguide structure can be easily extended to other similar compact structures to realize the sensing task and integrated with other photonic devices at the chip scale. This work paves the way toward the sensitive nanometer scale refractive index sensor for design and application.

关键词： Refractive index sensor Fano resonances surface plasmon polaritons MIM waveguides

Photonic spin Hall effect and terahertz gas sensor via InSb-supported long-range surface plasmon resonance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第1期31卷 286-292页

关键词： self-reference plasmonic sensor functional layer sensitivity

Plasmonic Refractive Index Sensors Based on One-and Two-Dimensional Gold Grating on a Gold Film

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonic Sensors 2020年第4期10卷 375-386页

作者： Jiankai ZHU Xiangxian WANG Yuan WU Yingwen SU Tianxu JIA Hua YANG Liping ZHANG yunping qi Xiaolei WEN School of Science Lanzhou University of TechnologyLanzhou 730050China College of Physics and Electronic Engineering Northwest Normal UniversityLanzhou 730070China Center for Micro-and Nanoscale Research and Fabrication University of Science and Technology of ChinaHefei 230026China

In this paper,we propose two kinds of composite structures based on the one-and two-dimensional(1D&2D)gold grating on a gold film for plasmonic refractive index *** resonance modes and sensing characteristics of the composite structures are numerically simulated by the finite-difference time-domain *** composite structure of the 1D gold semi-cylinder grating and gold film is analyzed first,and the optimized parameters of the grating period are *** sensitivity and figure of merit(FOM)can reach 660 RIU/nm and 169 RIU-1,***,we replace the 1D grating with the 2D gold semi-sphere particles array and find that the 2D grating composite structure can excite strong surface plasmon resonance intensity in a wider period *** sensitivity and FOM of the improved composite structure can reach 985 RIU/nm and 298 RIU-1,*** last,the comparison results of the sensing performance of the two structures are *** proposed structures can be used for bio-chemical refractive index sensing.

关键词： Surface plasmon refractive index sensor grating