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Ghandchi M, Darvish G, Moravvej-Farshi MK. Photoelectrical properties of integrated photodetectors based on bilayer graphene quantum dots with asymmetric metal contacts: a NEGF-DFT study. Phys Chem Chem Phys 2021; 24:1590-1597. [PMID: 34942635 DOI: 10.1039/d1cp04957g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We propose investigating the electro-optical properties of photodetectors based on mono- and bilayer graphene quantum dots or nanodots (GNDs). These photodetectors consist of dissimilar metals (gold, silver and titanium) that are in contact with the GNDs. To obtain photoelectrical characteristics, we employed density functional theory to solve the non-equilibrium Green's function. Photo-responsivities and quantum efficiencies obtained for these nanostructures were far better than those for structures based on graphene nanoribbons. Among the proposed photodetectors, the best performance belonged to the bilayer structures illuminated by in-plane polarized incident light. The proposed photodetectors operate without a need for externally applied voltage and are suitable for parallel light propagation using directional couplers based on the evanescent field of incident light; hence, they have applications in optical integrated circuits.
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Affiliation(s)
- Majid Ghandchi
- Department of Electrical Engineering, Ahar Branch, Islamic Azad University, Ahar 5451116714, Iran
| | - Ghafar Darvish
- Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran 1477893855, Iran.
| | - Mohammad Kazem Moravvej-Farshi
- Nano Plasmo-Photonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran 1411713116, Iran
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Qin Z, Liu Q, Yue C, Lang Y, Zhou X. Nanoscale film thickness measurement based on weak measurement. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:123111. [PMID: 33379970 DOI: 10.1063/5.0025552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
In this paper, a novel method of film thickness measurement based on weak measurements is proposed by analyzing the quantitative relationship between film thickness and the weak measurement amplified shift of the photonic spin Hall effect, and the corresponding measurement system is established to verify it through experiments. This method can measure the thickness of an arbitrary dielectric film with nanometer resolution. The theoretical analysis and experimental results show that the method is reasonable, feasible, and reliable, and the structure of the measurement system is simple, easy to operate, and easy to assemble into a prototype instrument. The measurement model and method provide not only a new way for the measurement of thin film thickness but also an important reference for the precise measurement of other optical interface parameters.
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Affiliation(s)
- Zirui Qin
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
| | - Qinggang Liu
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
| | - Chong Yue
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
| | - Yaopu Lang
- State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China
| | - Xinglin Zhou
- School of Communications, Wuhan University of Science and Technology, Wuhan 430081, China
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Xin M, Zeng L, Ran D, Chen X, Xu Y, Shi D, He Y, Zhong S. Label-free rapid identification of cooked meat using MIP-quantum weak measurement. FOOD AGR IMMUNOL 2020. [DOI: 10.1080/09540105.2020.1726879] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Affiliation(s)
- Meiguo Xin
- Department of Food Science and Technology, Foshan University, Guangdong, People’s Republic of China
| | - Lin Zeng
- Department of Food Science and Technology, Foshan University, Guangdong, People’s Republic of China
| | - Di Ran
- Department of Food Science and Technology, Foshan University, Guangdong, People’s Republic of China
| | - Xiangmei Chen
- Department of Food Science and Technology, Foshan University, Guangdong, People’s Republic of China
| | - Yang Xu
- Institute of Optical Imaging and Sensing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, People’s Republic of China
| | - Daoxuan Shi
- Institute of Optical Imaging and Sensing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, People’s Republic of China
| | - Yonghong He
- Institute of Optical Imaging and Sensing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, People’s Republic of China
| | - Suyi Zhong
- Institute of Optical Imaging and Sensing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, People’s Republic of China
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Xiong N, Guan T, Xu Y, Shi L, Zhong S, Zhou X, He Y, Li D. A Differential Detection Method Based on a Linear Weak Measurement System. SENSORS 2019; 19:s19112473. [PMID: 31151193 PMCID: PMC6603576 DOI: 10.3390/s19112473] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 05/25/2019] [Accepted: 05/29/2019] [Indexed: 11/30/2022]
Abstract
Self-reference detection is necessary and important to a biosensor. The linear weak measurement system based on total internal reflection has attracted widespread attention due to its high stability, label-free detection, and easy integration. In this paper, we propose a differential detection method based on the linear total internal reflection weak measurement system. We introduce the half-wave plate (HWP) to convert the H light and the V light to each other, thereby obtaining the difference in phase change of the optical path before and after the HWP. Experiments show that the system can not only achieve differential detection, but also has high stability. The linear differential weak measurement system proposed in this paper not only provides a new differential measurement method for real-time biosensors, but also enriches the types of weak measurement sensors.
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Affiliation(s)
- Nian Xiong
- College of Information Science and Technology, Jinan University, Guangzhou 510632, Guangdong, China.
| | - Tian Guan
- Institute of Optical Imaging and Sensing, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
- School of Medicine, Tsinghua University, Beijing 100084, China.
| | - Yang Xu
- Institute of Optical Imaging and Sensing, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Lixuan Shi
- Institute of Optical Imaging and Sensing, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
- Department of Physics, Tsinghua University, Beijing 100084, China.
| | - Suyi Zhong
- Institute of Optical Imaging and Sensing, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
- School of Medicine, Tsinghua University, Beijing 100084, China.
| | - Xuesi Zhou
- Institute of Optical Imaging and Sensing, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Yonghong He
- Institute of Optical Imaging and Sensing, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
- Department of Physics, Tsinghua University, Beijing 100084, China.
| | - Dongmei Li
- Center for Optics & Optoelectronics Research, Collaborative Innovation Center for Information Technology in Biological and Medical Physics, College of Science, Zhejiang University of Technology, Hangzhou 310023, China.
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