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学者姓名：赖云锋
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Abstract ：
Different from conventional mode-order converters, the mode exchangers (EXCij), enabling flexible data exchanging between i-th-mode and j-th-mode, are essential building blocks for passive signal switching, signal routing, and high-capacity mode division multiplexing (MDM) networks. However, mode changers are limited by the strong polarization-dependence, especially on the 220-nm-thick silicon-on-insulator (SOI) platform. In this paper, an ultracompact and polarization-independent EXC01 and EXC02 are proposed to overcome this limitation by using MZI-like models. Here, subwavelength grating (SWG) metamaterials are introduced to the input/output Y-branches for mode splitting/combining and one arm for phase shifting. As such, a pi phase difference is formed by the SWG-manipulated phase shifter and then the modes guided in branches are combined into the required output modes. The characterizations show low insertion losses (<1.6 dB) and crosstalk (<-15 dB) over bandwidths of 31 nm and 49 nm, for EXC01 and EXC02, respectively. For footprints, EXC01/EXC02 has ultracompact size of 13.42 x 1.704/2.044 x 8.434 mu m(2). For the first time, a polarization-independent mode change between 0-th-mode (0-th-mode) and 1-th-mode (2-th-mode) are achieved and can be applied in in flexible MDM systems, signal routing, passive signal switching and beyond.
Keyword ：
Bandwidth Bandwidth Integrated optical devices Integrated optical devices Metamaterials Metamaterials mode change mode change mode division multiplexing mode division multiplexing mode-order converters mode-order converters multimode photonics multimode photonics Optical sensors Optical sensors Phase shifters Phase shifters Photonics Photonics Refractive index Refractive index Silicon Silicon
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| GB/T 7714 | Guo, Zhenzhao , Wu, Shengbao , Lai, Yunfeng et al. Ultracompact and Polarization-Independent On-Chip Mode Exchangers Enabled by Subwavelength Grating Metamaterials [J]. | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2025 , 43 (1) : 308-316 . |
| MLA | Guo, Zhenzhao et al. "Ultracompact and Polarization-Independent On-Chip Mode Exchangers Enabled by Subwavelength Grating Metamaterials" . | JOURNAL OF LIGHTWAVE TECHNOLOGY 43 . 1 (2025) : 308-316 . |
| APA | Guo, Zhenzhao , Wu, Shengbao , Lai, Yunfeng , Cheng, Shuying . Ultracompact and Polarization-Independent On-Chip Mode Exchangers Enabled by Subwavelength Grating Metamaterials . | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2025 , 43 (1) , 308-316 . |
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Topological edge states, emerging at boundaries between regions with distinct topological properties, enable unidirectional transmission with robustness against defects and disorder. However, achieving dual-band operation with high performance remains challenging. Here, we integrate dual-band topological edge states into a valley photonic crystal cavity operating in the mid-infrared region, leveraging triangular scatterers. A key contribution of this work is the simultaneous realization of ultra-high Q-factors (up to 6.1593 × 109) and uniform mode distribution (inverse participation ratio © 2025 by the authors.
Keyword ：
Inverse problems Inverse problems Photonic integrated circuits Photonic integrated circuits Q factor measurement Q factor measurement
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| GB/T 7714 | Kang, Chen , Yu, Jinling , Chen, Can et al. Dual-Band Topological Valley Cavity in Mid-Infrared Range [J]. | Photonics , 2025 , 12 (5) . |
| MLA | Kang, Chen et al. "Dual-Band Topological Valley Cavity in Mid-Infrared Range" . | Photonics 12 . 5 (2025) . |
| APA | Kang, Chen , Yu, Jinling , Chen, Can , Lai, Yunfeng , Cheng, Shuying , Chen, Yonghai et al. Dual-Band Topological Valley Cavity in Mid-Infrared Range . | Photonics , 2025 , 12 (5) . |
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Chiral metasurfaces with high quality factors (Q-factors) are a promising platform for achieving chiral optical responses. However, the optical properties of most metasurfaces are fixed once they are fabricated. Here, we study the effect of phase-change material Ge2Sb2Te5 (GST) on the chiral optics of a planar chiral Si metasurface driven by bound states in the continuum (BICs), as the refractive index of the phase-change material changes before and after the phase change. The planar chiral silicon metasurface is capable of generating near-unity (0.99) circular dichroism and giant (0.996) linear dichroism in the infrared region. Notably, phase-change material GST is integrated into the Z-shaped Si metasurfaces. We actively tune the dissipative loss by causing the GST to undergo a phase transition, thereby modulating the optical chirality. In addition, we numerically simulate the effect of the thickness of the phase-change layer and the embedded position on the optical response. Compared with single-functional metasurfaces, this device exhibits better flexibility and more functionalities. It is demonstrated that the optical chirality of the metasurface can be well controlled using the phase-change material GST. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
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| GB/T 7714 | Chen, Can , Yu, Jinling , Kang, Chen et al. Chiral optical modulation of Si-Ge2Sb2Te5 2 Sb 2 Te 5 composite metasurfaces driven by quasi-bound states in the continuum [J]. | APPLIED OPTICS , 2024 , 63 (29) : 7682-7691 . |
| MLA | Chen, Can et al. "Chiral optical modulation of Si-Ge2Sb2Te5 2 Sb 2 Te 5 composite metasurfaces driven by quasi-bound states in the continuum" . | APPLIED OPTICS 63 . 29 (2024) : 7682-7691 . |
| APA | Chen, Can , Yu, Jinling , Kang, Chen , Chen, Yonghai , Lai, Yunfeng , Cheng, Shuying . Chiral optical modulation of Si-Ge2Sb2Te5 2 Sb 2 Te 5 composite metasurfaces driven by quasi-bound states in the continuum . | APPLIED OPTICS , 2024 , 63 (29) , 7682-7691 . |
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Helicity-dependent photocurrent (HDPC) and its modulation in topological insulator Bi2Te3 nanowires have been investigated. It is revealed that when the incident plane of a laser is perpendicular to the nanowire, the HDPC is an odd function of the incident angle, which is mainly contributed by the circular photogalvanic effect originating from the surface states of Bi2Te3 nanowire. When the incident plane of a laser is parallel to the nanowire, the HDPC is approximately an even function of the incident angle, which is due to the circular photon drag effect coming from the surface states. It is found that the HDPC can be effectively tuned by the back gate and the ionic liquid top gate. By analyzing the substrate dependence of the HDPC, we find that the HDPC of the Bi2Te3 nanowire on the Si substrate is an order of magnitude larger than that on SiO2, which may be due to the spin injection from the Si substrate to the Bi2Te3 nanowire. In addition, by applying different biases, the Stokes parameters of a polarized light can be extracted by arithmetic operation of the photocurrents measured in the Bi2Te3 nanowire. This work suggests that topological insulator Bi2Te3 nanowires may provide a good platform for opto-spintronic devices, especially in chirality and polarimtry detection.
Keyword ：
Bi2Te3 Nanowires Bi2Te3 Nanowires Helicity DependentPhotocurrent Helicity DependentPhotocurrent Ionic Liquid Gating Ionic Liquid Gating Stokes ParameterDetection Stokes ParameterDetection Substrates Substrates
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| GB/T 7714 | Yu, Qin , Feng, Shizun , Yu, Jinling et al. Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires [J]. | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (30) : 40297-40308 . |
| MLA | Yu, Qin et al. "Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires" . | ACS APPLIED MATERIALS & INTERFACES 16 . 30 (2024) : 40297-40308 . |
| APA | Yu, Qin , Feng, Shizun , Yu, Jinling , Cheng, Shuying , Lai, Yunfeng , Chen, Yonghai et al. Manipulation of Helicity-Dependent Photocurrent and Stokes Parameter Detection in Topological Insulator Bi2Te3 Nanowires . | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (30) , 40297-40308 . |
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The helicity-dependent photocurrent (HDPC) of Fe4GeTe2 (3, 5, 8, 10 nm)/Bi2Te3 (8 nm) heterostructures grown on sapphire substrates was systematically investigated. It is revealed that the HDPC is induced by the interface coupling between the Fe4GeTe2 and Bi2Te3 films, and it is dominated by the circular photogalvanic effect (CPGE) rather than by the circular photodrag effect (circular photon drag effect). As the tensile strain increases, the CPGE current decreases, which can be attributed to the decrease of the interface-induced spin-orbit coupling with increasing tensile strain. In addition, it is demonstrated that by applying appropriate tensile strain, the 5 nm Fe4GeTe2/Bi2Te3 sample can be used to detect the circular polarization state of a light. Finally, Fe4GeTe2 (5, 8, and 10 nm)/Bi2Te3 (8 nm) heterostructures show a T-C larger than 390 K. The dependence of the CPGE on the film thickness of Fe4GeTe2 is different from that of Curie temperature, indicating that the enhanced exchange interaction induced by the interface coupling may be the dominant mechanism for the high-T-C ferromagnetism. The large interface-induced CPGE in the Fe4GeTe2/Bi2Te3 suggests that Fe4GeTe2/Bi2Te3 heterostructures may provide a good platform for designing novel opto-spintronic devices.
Keyword ：
2D ferromagnetic Fe4GeTe2/Bi2Te3 heterostructures 2D ferromagnetic Fe4GeTe2/Bi2Te3 heterostructures circular photogalvaniceffect circular photogalvaniceffect circular polarization detection circular polarization detection ferromagnetism ferromagnetism interface-induced helicity-dependentphotocurrent interface-induced helicity-dependentphotocurrent strain strain
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| GB/T 7714 | Lin, Zongkai , Zhao, Runyu , Yu, Jinling et al. Investigation of Interface-Induced Helicity-Dependent Photocurrent and High-T C Ferromagnetism in Wafer-Scale 2D Ferromagnetic Fe4GeTe2/Bi2Te3 Heterostructures [J]. | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (49) : 68542-68552 . |
| MLA | Lin, Zongkai et al. "Investigation of Interface-Induced Helicity-Dependent Photocurrent and High-T C Ferromagnetism in Wafer-Scale 2D Ferromagnetic Fe4GeTe2/Bi2Te3 Heterostructures" . | ACS APPLIED MATERIALS & INTERFACES 16 . 49 (2024) : 68542-68552 . |
| APA | Lin, Zongkai , Zhao, Runyu , Yu, Jinling , Li, Qiang , Xie, Weiran , Lai, Yunfeng et al. Investigation of Interface-Induced Helicity-Dependent Photocurrent and High-T C Ferromagnetism in Wafer-Scale 2D Ferromagnetic Fe4GeTe2/Bi2Te3 Heterostructures . | ACS APPLIED MATERIALS & INTERFACES , 2024 , 16 (49) , 68542-68552 . |
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Helicity-dependent photocurrent (HDPC) of the surface states in a high-quality topological insulator (Bi0.7Sb0.3)(2)Te-3 nanoplate grown by chemical vapor deposition (CVD) is investigated. By investigating the angle-dependent HDPC, it is found that the HDPC is mainly contributed by the circular photogalvanic effect (CPGE) current when the incident plane is perpendicular to the connection of the two contacts, whereas the circular photon drag effect (CPDE) dominates the HDPC when the incident plane is parallel to the connection of the two contacts. In addition, the CPGE of the (Bi0.7Sb0.3)(2)Te-3 nanoplate is regulated by temperature, light power, excitation wavelength, the source-drain and ionic liquid top-gate voltages, and the regulation mechanisms are discussed. It is demonstrated that (Bi0.7Sb0.3)(2)Te-3 nanoplates may provide a good platform for novel opto-spintronics devices.
Keyword ：
(Bi0.7Sb0.3)(2)Te-3 nanoplate (Bi0.7Sb0.3)(2)Te-3 nanoplate circular photogalvanic effect circular photogalvanic effect helicity-dependent photocurrent helicity-dependent photocurrent ionic liquid gating ionic liquid gating
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| GB/T 7714 | Yu, Qin , Yu, Jinling , Chen, Yonghai et al. Investigation of helicity-dependent photocurrent of surface states in (Bi0.7Sb0.3)2Te3 nanoplate [J]. | CHINESE PHYSICS B , 2024 , 33 (5) . |
| MLA | Yu, Qin et al. "Investigation of helicity-dependent photocurrent of surface states in (Bi0.7Sb0.3)2Te3 nanoplate" . | CHINESE PHYSICS B 33 . 5 (2024) . |
| APA | Yu, Qin , Yu, Jinling , Chen, Yonghai , Lai, Yunfeng , Cheng, Shuying , He, Ke . Investigation of helicity-dependent photocurrent of surface states in (Bi0.7Sb0.3)2Te3 nanoplate . | CHINESE PHYSICS B , 2024 , 33 (5) . |
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Orthogonal eigenmodes in multimode waveguides are an indispensable physical dimension for enhancing the capacity of optical communications, and efficient mode converters are therefore of vital functional significance. However, the conventional single-pair mode conversion in a single device is having difficulty meeting the ever-increasing demand for optical capacity. By contrast, the multi-pair mode converter can improve the multiplexing capacity and be further applied in spatial-mode-oriented passive signal switching and permutation cipher. Here, a scalable multi-mode converting model, combing the multimode interference and beam shaping by exploiting subwavelength metamaterials, is firstly reported to enable simultaneous multi-spatial-mode manipulation and break its polarization-dependency limit. Based on this model, five proof-of-concept converters are designed, realizing polarization-independent, and multi-mode conversions, or a combination of both within compact lengths (< 17.436 mu m). For the first time, TE0/TM0-to-TE2/TM2, TE0/TE1/TE2-to-TE2/TE3/ TE4, TE0/TE1/TM0/TM1-to-TE2/TE3/TM2/TM3, and TE0/TE1-to-TE1/TE2 converters are reported and experimentally demonstrated, covering a double/triple/quadruple-mode manipulation in a single device. From measurements, these converters exhibit low insertion losses (0.72 to 1.65 dB) and intermodal crosstalks (-30.26 to -12.19 dB) at 1550 nm, and have a 56-nm/30-nm bandwidth of loss < 1.4 dB/1.9 dB and crosstalk < -13 dB/-10.5 dB, for the best/worst case. The proposed multi-mode converting model can manipulate multiple input modes in parallel and beak the polarization-dependency limit for multi-spatial-mode conversion, which holds great potential for spatial-mode-oriented nanophotonic systems.
Keyword ：
Integrated optical devices Integrated optical devices mode division (de)multiplexing mode division (de)multiplexing mode-order converter mode-order converter
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| GB/T 7714 | Guo, Zhenzhao , Xiao, Jinbiao , Wu, Shengbao et al. Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings [J]. | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2024 , 42 (20) : 7267-7281 . |
| MLA | Guo, Zhenzhao et al. "Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings" . | JOURNAL OF LIGHTWAVE TECHNOLOGY 42 . 20 (2024) : 7267-7281 . |
| APA | Guo, Zhenzhao , Xiao, Jinbiao , Wu, Shengbao , Lai, Yunfeng , Cheng, Shuying . Compact, Scalable and Flexible Multi-Mode-Converting Model Employing Subwavelength Gratings . | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2024 , 42 (20) , 7267-7281 . |
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Abstract ：
Helicity-dependent photocurrent (HDPC) of the surface states in a high-quality topological insulator (Bi0.7Sb0.3)2Te3 nanoplate grown by chemical vapor deposition (CVD) is investigated. By investigating the angle-dependent HDPC, it is found that the HDPC is mainly contributed by the circular photogalvanic effect (CPGE) current when the incident plane is perpendicular to the connection of the two contacts, whereas the circular photon drag effect (CPDE) dominates the HDPC when the incident plane is parallel to the connection of the two contacts. In addition, the CPGE of the (Bi0.7Sb0.3)2Te3 nanoplate is regulated by temperature, light power, excitation wavelength, the source–drain and ionic liquid top-gate voltages, and the regulation mechanisms are discussed. It is demonstrated that (Bi0.7Sb0.3)2Te3 nanoplates may provide a good platform for novel opto-spintronics devices.
Keyword ：
(BiSb)Te nanoplate (BiSb)Te nanoplate circular photogalvanic effect circular photogalvanic effect helicity-dependent photocurrent helicity-dependent photocurrent ionic liquid gating ionic liquid gating
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| GB/T 7714 | Qin Yu , Jinling Yu , Yonghai Chen et al. Investigation of helicity-dependent photocurrent of surface states in (BiSb)Te nanoplate [J]. | Chinese Physics B , 2024 , 33 (5) . |
| MLA | Qin Yu et al. "Investigation of helicity-dependent photocurrent of surface states in (BiSb)Te nanoplate" . | Chinese Physics B 33 . 5 (2024) . |
| APA | Qin Yu , Jinling Yu , Yonghai Chen , Yunfeng Lai , Shuying Cheng , Ke He . Investigation of helicity-dependent photocurrent of surface states in (BiSb)Te nanoplate . | Chinese Physics B , 2024 , 33 (5) . |
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The helicity-dependent photoconductance of the edge states in three-dimensional topological insulator Bi2Te3 films is investigated. It is revealed that the helicity-dependent photoconductivity current on the left edge of the Bi2Te3 film shows an opposite sign with that on the right edge. In addition, the helicity-dependent photoconductivity current increases linearly with the applied longitudinal electric field, and it reverses the sign with the reversal of the electric field. As the thickness of the Bi2Te3 film increases, the helicity-dependent photoconductivity current also increases. Theoretical analysis suggests that the helicity-dependent photo-conductivity current may come from the intrinsic spin orbit coupling (SOC) or the SOC introduced by the chiral impurities or defects.
Keyword ：
Bi2Te3 Bi2Te3 edge states edge states helicity-dependent photoconductance helicity-dependent photoconductance spin orbit coupling spin orbit coupling
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| GB/T 7714 | Zhou, Yuchao , Yu, Jinling , Chen, Yonghai et al. Helicity-dependent photoconductance of the edge states in the topological insulator Bi2Te3 [J]. | CHINESE PHYSICS B , 2023 , 32 (8) . |
| MLA | Zhou, Yuchao et al. "Helicity-dependent photoconductance of the edge states in the topological insulator Bi2Te3" . | CHINESE PHYSICS B 32 . 8 (2023) . |
| APA | Zhou, Yuchao , Yu, Jinling , Chen, Yonghai , Lai, Yunfeng , Cheng, Shuying . Helicity-dependent photoconductance of the edge states in the topological insulator Bi2Te3 . | CHINESE PHYSICS B , 2023 , 32 (8) . |
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Optical helicity provides us with an effective means to control the helicity-dependent photocurrent in the spin-momentum-locked surface states of topological insulators(TIs).Also,the TIs show potential in polarization de-tection as an intrinsic solid-state optical chirality detector for easier integration and fabrication.However,the com-plex photoresponses with the circular photogalvanic effect,the linear photogalvanic effect,and the photon drag effect in the TIs prevent them from direct chirality detection of the elliptically polarized light.Here,by fitting with the theoretical models to the measured photocurrents,the microscopic origin of different components of the helicity-dependent photocurrent has been demonstrated.We show a comprehensive study of the helicity-dependent photocurrent in(Bi1-xSbx)2Te3 thin films of different thicknesses as a function of the light incident angle and the gate-tuned chemical potential.The observation of the light incident angle dependence of the helicity-dependent photocurrent provides us with a polarization detection strategy using a TI thin film without the use of any additional optical elements,and the detection accuracy can be enhanced by gate tuning.Additionally,the Stokes parameters can be extracted by arithmetic operation of photocurrents measured with different incident angles and gating voltages for complete characterization of the polarization states of a light beam.Using this means,we realize the polarization detection and the Stokes parameters analysis with a single device.Our work provides an alter-native solution to develop miniaturized intrinsic polarization-sensitive photodetectors.
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| GB/T 7714 | SHENZHONG CHEN , JINLING YU , XIYU HONG et al. Gate voltage control of helicity-dependent photocurrent and polarization detection in(Bi1-xSbx)2Te3 topological insulator thin films [J]. | 光子学研究（英文） , 2023 , 11 (11) : 1902-1911 . |
| MLA | SHENZHONG CHEN et al. "Gate voltage control of helicity-dependent photocurrent and polarization detection in(Bi1-xSbx)2Te3 topological insulator thin films" . | 光子学研究（英文） 11 . 11 (2023) : 1902-1911 . |
| APA | SHENZHONG CHEN , JINLING YU , XIYU HONG , KEJING ZHU , YONGHAI CHEN , SHUYING CHENG et al. Gate voltage control of helicity-dependent photocurrent and polarization detection in(Bi1-xSbx)2Te3 topological insulator thin films . | 光子学研究（英文） , 2023 , 11 (11) , 1902-1911 . |
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