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学者姓名：郭振钊
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Abstract ：
We present and experimentally demonstrate a compact, ultra-broadband, and scalable multi-port waveguide crossing architecture that supports dual-polarization operation across both the O–L communication bands and the emerging 2 μm mid-infrared (MIR) window. The design is based on a composite subwavelength grating structure and implemented on a standard 220 nm silicon-on-insulator platform using a single-step etching process. A unified multimode interference-based building block enables highly compact 2×2, 3×3, and 4×4 configurations with symmetric layouts, achieving footprints as small as 14×14 μm² for the international telecommunication union (ITU) bands and 16×16 μm² at 2 μm. The 2×2 crossing demonstrates record-wide bandwidths of ∼380 nm (1300–1680 nm) with low insertion losses of <0.3 dB / <0.2 dB (TE/TM) and crosstalk below -20 dB / -30 dB across the ITU bands. Even better performance is achieved for the TE mode in the 2 μm MIR range ∼400 nm (1760–2150 nm). To the best of our knowledge, this is the first demonstration of a dual-polarization waveguide crossing with such extensive bandwidth coverage in the ITU bands and the widest reported in the 2 μm MIR regime. The proposed architecture offers a scalable, fabrication-friendly solution for next-generation high-density photonic integrated circuits with polarization- and wavelength-division multiplexing capabilities across multiple spectral domains. © 1983-2012 IEEE.
Keyword ：
Integrated photonics Integrated photonics Silicon photonics Silicon photonics Subwavelength gratings Subwavelength gratings Waveguide crossing Waveguide crossing
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| GB/T 7714 | Gao, Z. , Yu, Q. , Guo, Z. et al. Ultra-Broadband Dual-Polarization Silicon Waveguide Crossing Architecture for Scalable Multi-Port Operation across ITU and 2 μm MIR Bands [J]. | Journal of Lightwave Technology , 2025 . |
| MLA | Gao, Z. et al. "Ultra-Broadband Dual-Polarization Silicon Waveguide Crossing Architecture for Scalable Multi-Port Operation across ITU and 2 μm MIR Bands" . | Journal of Lightwave Technology (2025) . |
| APA | Gao, Z. , Yu, Q. , Guo, Z. , Zhang, L. , Xiao, J. , Wu, S. et al. Ultra-Broadband Dual-Polarization Silicon Waveguide Crossing Architecture for Scalable Multi-Port Operation across ITU and 2 μm MIR Bands . | Journal of Lightwave Technology , 2025 . |
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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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Tunable multiband asymmetric transmission (AT) effect is effectively demonstrated using a polydimethylsiloxane (PDMS)-based flexible chiral metamaterial (FCM) in the mid-infrared region. The unit cell of the FCM comprises J-shaped and F-shaped gold patterns to achieve three-dimensional (3D) chirality, and a multiband AT effect can be realized. Due to the excitation of enantiomerically sensitive plasmons, the FCM can realize a tunable multiband AT effect that is rarely reported, whose peak values can reach 51.89%, 37.72%, and 28.91% at resonance wavelengths of 9.03 mu m, 10.25 mu m, and 12.77 mu m, respectively. The tunability of the FCM demonstrated that the peaks of AT shift to longer wavelengths when stretching along different directions respectively. Compared with reported refractive index sensors based on chiral metamaterial, FCM has tunable multibands and better refractive index sensitivity, which can reach 7875 nm/RIU, 3375 nm/RIU, and 1625 nm/RIU, respectively. Our proposed FCM opens an avenue to develop refractive index sensors. (c) 2025 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 | Lu, Mengjia , Guo, Zhenzhao , Deng, Chunyu et al. Tunable multiband asymmetric transmission based on flexible chiral metamaterial for refractive index sensing [J]. | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2025 , 42 (2) : 419-424 . |
| MLA | Lu, Mengjia et al. "Tunable multiband asymmetric transmission based on flexible chiral metamaterial for refractive index sensing" . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 42 . 2 (2025) : 419-424 . |
| APA | Lu, Mengjia , Guo, Zhenzhao , Deng, Chunyu , Hu, Xuefang , Chen, Mengmeng . Tunable multiband asymmetric transmission based on flexible chiral metamaterial for refractive index sensing . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2025 , 42 (2) , 419-424 . |
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We propose and experimentally demonstrate a compact crossing based on a sub- wavelength grating slot waveguide (SWG-SW), leveraging the anisotropic properties of two orthogonal SWG-SWs to suppress diffraction effects in the crossing region for the input TE polarization mode. The design utilizes the unique mode characteristics of the SWG-SW, enabling low-loss mode transitions through the crossing with a simple and compact hollow structure design at its center. By integrating the above crossing with a well-designed slot-to-SWG-SW mode converter, a crossing for the widely used slot waveguides is achieved, with a footprint of similar to 18x18 mu m2. Simulation results show that the device achieves an insertion loss (IL) of <0.35 dB and a crosstalk (CT) of <-40 dB over a bandwidth range of 1500-1600 nm. Experimental results confirm that within the wavelength range of 1500-1580 nm, the IL is approximately 0.4 dB, and CT values are below-28 dB. To further improve the device performance, additional side grating arrays are incorporated into the design. The optimized structure with side gratings achieves IL of <0.13 dB and CT values around-35 dB. Experimental measurements of the device with side gratings demonstrate a stable IL of approximately 0.1 dB and CT values consistently below-35 dB, marking a significant improvement over the original design. To the best of our knowledge, this is the first experimentally verified crossing for slot waveguides. Further analysis indicates that the device exhibits an exceptionally broad bandwidth of approximately 576 nm (1257 nm to 1833nm) with IL < 1 dB and CT < -30 dB. (c) 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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| GB/T 7714 | Zhu, Jiabao , Yu, Qianli , Jin, Yuelong et al. Compact and low-loss on-chip silicon crossing based on subwavelength grating slot waveguides [J]. | OPTICS EXPRESS , 2025 , 33 (3) : 4902-4914 . |
| MLA | Zhu, Jiabao et al. "Compact and low-loss on-chip silicon crossing based on subwavelength grating slot waveguides" . | OPTICS EXPRESS 33 . 3 (2025) : 4902-4914 . |
| APA | Zhu, Jiabao , Yu, Qianli , Jin, Yuelong , Huang, Chongjia , Guo, Zhenzhao , Hao, Peng et al. Compact and low-loss on-chip silicon crossing based on subwavelength grating slot waveguides . | OPTICS EXPRESS , 2025 , 33 (3) , 4902-4914 . |
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Mode-division multiplexing (MDM) greatly enhances the capacity of on-chip photonic interconnects, yet traditional MDM techniques struggle with direct access to specific lower-order modes within multimode bus waveguides, limiting scalability and flexibility. In this paper, we introduce a compact and flexible MDM architecture featuring an engine that combines a grating-engineered backward mode converter (BMC) with a bidirectional asymmetric directional coupler (Bi-ADC). The BMC is precisely engineered to leverage the modal properties of the multimode bus waveguide, enabling efficient switching between two designated modes while minimizing crosstalk with other modes. The Bi-ADC operates analogously to a 2 x 2 coupler and integrates a single-mode access waveguide with the bus waveguide, allowing for independent routing of two modes through the access waveguide's ports. This approach provides a more compact design compared to conventional MDM techniques and facilitates the insertion of lower-order modes at arbitrary positions along the bus waveguide. Furthermore, this architecture can be combined with an optical switch to develop a bidirectional, dual-mode switchable add-drop mode multiplexer. To demonstrate its feasibility, we design two BMC-based engines for TE0-TE1 and TE0-TE2 mode conversions and assess their performance numerically as 4-mode/5-mode demultiplexers. Experimental results showcase a 4-channel mode demultiplexer (TE0, TE1, TE2, and TM0) based on the TE0-TE1 engine, achieving insertion losses (ILs) of 2.4 dB, 0.3 dB, 1.28 dB, and 0.75 dB at a wavelength of 1550 nm. The modal crosstalk is below -17.5 dB for all channels, with an IL<3 dB bandwidth exceeding 100 nm.
Keyword ：
Arrayed waveguide gratings Arrayed waveguide gratings Couplings Couplings Demultiplexing Demultiplexing Engines Engines Gratings Gratings Integrated photonics devices Integrated photonics devices mode division multiplexing mode division multiplexing mode multiplexer mode multiplexer Optical switches Optical switches Optical waveguides Optical waveguides Optimization Optimization Scalability Scalability System-on-chip System-on-chip waveguide grating waveguide grating
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| GB/T 7714 | Zhang, Lei , Gu, Xiaofei , Yu, Qianli et al. Compact and Flexible On-Chip Mode Division Multiplexing Enabled by a Grating Engineered Backward Mode Conversion Engine [J]. | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2025 , 43 (6) : 2716-2724 . |
| MLA | Zhang, Lei et al. "Compact and Flexible On-Chip Mode Division Multiplexing Enabled by a Grating Engineered Backward Mode Conversion Engine" . | JOURNAL OF LIGHTWAVE TECHNOLOGY 43 . 6 (2025) : 2716-2724 . |
| APA | Zhang, Lei , Gu, Xiaofei , Yu, Qianli , Guo, Zhenzhao , Xiao, Jinbiao , Wu, Shengbao . Compact and Flexible On-Chip Mode Division Multiplexing Enabled by a Grating Engineered Backward Mode Conversion Engine . | JOURNAL OF LIGHTWAVE TECHNOLOGY , 2025 , 43 (6) , 2716-2724 . |
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High-performance polarization beam splitters (PBSs) are essential for maintaining signal integrity and minimizing interference in advanced photonic applications. This paper experimentally demonstrates a high-performance, ultra-broadband on-chip silicon PBS that integrates a mode conversion Bragg grating (MC-BG) with an adiabatic asymmetric directional coupler (ADC). The MC-BG is implemented by etching a hole-structured grating array into a multimode waveguide, serving as a polarization-dependent broadband mode router. It directs the input TM0 and TE0 modes in opposite directions while simultaneously converting the TE0 mode into a higher-order TE2 mode. The transformed TE2 mode is then extracted from the multimode waveguide via a specially designed broadband adiabatic ADC, exiting through the cross port. This design achieves theoretically high performance with an extinction ratio (ER) of >30 dB/15 dB and an insertion loss (IL) of <0.9 dB/2 dB over bandwidths of 265 nm (1410-1675 nm) and 375 nm (1300-1675 nm), respectively. Fabricated on a standard 220 nm silicon-on-insulator (SOI) wafer using a single-step etching process, experimental results reveal that, for a device length of 91.7 mu m, the bandwidth with ERs exceeding 30 dB spans more than 220 nm. To our knowledge, this is the first demonstration of a PBS on a 220 nm SOI platform achieving an experimentally verified ER exceeding 30 dB over a bandwidth greater than 200 nm. Furthermore, our analysis indicates that performance can be further improved by incorporating a TM2 mode stripper, extending the 30 dB bandwidth to nearly 295 nm. (c) 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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| GB/T 7714 | Zhang, Lei , Gao, Zhiyuan , Mei, Zishuo et al. High-performance, ultra-broadband silicon polarization beam splitter utilizing mode conversion Bragg gratings [J]. | OPTICS EXPRESS , 2025 , 33 (4) : 7771-7783 . |
| MLA | Zhang, Lei et al. "High-performance, ultra-broadband silicon polarization beam splitter utilizing mode conversion Bragg gratings" . | OPTICS EXPRESS 33 . 4 (2025) : 7771-7783 . |
| APA | Zhang, Lei , Gao, Zhiyuan , Mei, Zishuo , Guo, Zhenzhao , Yu, Qianli , Feng, Ting et al. High-performance, ultra-broadband silicon polarization beam splitter utilizing mode conversion Bragg gratings . | OPTICS EXPRESS , 2025 , 33 (4) , 7771-7783 . |
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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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A broadband and low-loss power splitter with polarization manipulation using subwavelength gratings (SWGs) is proposed and analyzed, where SWGs are embedded in input taper/output inverse tapered waveguides in the bottom layer to form an SWG-based structure, and a silicon nitride layer is placed above the bottom layer to form a low-index guiding structure. In the bottom layer, the TE mode is cut off as the input strip waveguide is tapered down. In this way, the injected TE mode is evenly coupled to two adjacent output ports with high efficiency by the assistance of SWGs. By contrast, the input TM mode is well supported by the above silicon nitride layer and directly transmitted to the Through port, which is almost not influenced by the bottom structures. Consequently, both power splitting and polarization handling are achieved in the designed device simultaneously. Simulation results show that an extinction ratio (ER) of 32.63 dB (18.56 dB) and insertion loss (IL) of 0.16 dB (0.16 dB) for the TE (TM) mode are obtained at 1.55 mu m. The bandwidth is up to 191 nm (1450-1641 nm) for the TE mode and 200 nm (1450-1650 nm) for the TM mode with an ER exceeding 15 dB and IL below 0.3 dB. Furthermore, fabrication tolerances and power distribution with polarization manipulation through the device are also presented. (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 | Lu, Mengjia , Guo, Zhenzhao , Deng, Chunyu et al. Broadband and low-loss power splitter with polarization manipulation using subwavelength gratings [J]. | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2024 , 41 (8) : 1856-1862 . |
| MLA | Lu, Mengjia et al. "Broadband and low-loss power splitter with polarization manipulation using subwavelength gratings" . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 41 . 8 (2024) : 1856-1862 . |
| APA | Lu, Mengjia , Guo, Zhenzhao , Deng, Chunyu , Hu, Xuefang , Chen, Mengmeng . Broadband and low-loss power splitter with polarization manipulation using subwavelength gratings . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2024 , 41 (8) , 1856-1862 . |
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We present what we believe is the first report on a polarization-insensitive 3 x 3 silicon star-crossing utilizing a composite subwavelength metamaterial waveguide structure. Two different types of subwavelength grating meta- materials (nanohole grating and fan-shaped bent subwavelength grating) are respectively used to address diffraction issues in the crossing region and mode interference issues caused by a compact non-adiabatic design. This approach results in a device with an ultra-compact footprint of 12.68 x 10.98 mu m(2) on a standard 220 nm silicon-on-insulator (SOI) platform. Simulation results show low insertion loss (IL) values of < 0.2 dB/0.3 dB and suppressed cross talk (CT) levels of < -27.2 dB/-23.6 dB for TE/TM polarizations across a wavelength range of 100 nm (1500-1600 nm). Experimental measurements of the fabricated devices confirm outstanding performance, with IL values of < 0.35 dB/0.4 dB and CT levels of < -31.5 dB/-28.6 dB for TE/TM polarization in the C-band. (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 | Yu, Qianli , Guo, Zhenzhao , Zhu, Jiabao et al. Ultra-compact and polarization-insensitive silicon waveguide 3 x 3 star-crossing based on composite subwavelength grating metamaterials [J]. | OPTICS LETTERS , 2024 , 49 (15) : 4326-4329 . |
| MLA | Yu, Qianli et al. "Ultra-compact and polarization-insensitive silicon waveguide 3 x 3 star-crossing based on composite subwavelength grating metamaterials" . | OPTICS LETTERS 49 . 15 (2024) : 4326-4329 . |
| APA | Yu, Qianli , Guo, Zhenzhao , Zhu, Jiabao , Zhang, Lei , Hao, Peng , Xiao, Jinbiao et al. Ultra-compact and polarization-insensitive silicon waveguide 3 x 3 star-crossing based on composite subwavelength grating metamaterials . | OPTICS LETTERS , 2024 , 49 (15) , 4326-4329 . |
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This study presents the design and experimental demonstration of a high-performance all-silicon transverse magnetic (TM) polarizer. The tilted-elliptical-hole arrays are designed to effectively reflect transverse electric (TE) modes while propagating TM modes with low loss. The device bandwidth (BW) is controlled by changing the tilting angle of the elliptical hole or by combining it with changes in other parameters. The device operates beyond 326 nm (1385-1711 nm) in BW, achieving an average insertion loss (IL) below 1.0 dB and a polarization extinction ratio (PER) over 20 dB. A 20 nm shift in BW can be obtained with a 30 degrees deflection, and an 80 nm shift can be achieved with multiple parameter changes. The experimental results confirm the theoretical analysis. The present device with the advantages of simple structure, flexible design, and broad BW has great potential applications in silicon photonics. (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 | Yu, Yaxin , Guo, Zhenzhao , Wu, Shengbao et al. Design and experimental demonstration of a high-performance all-silicon transverse magnetic polarizer using tilted-elliptical-hole arrays [J]. | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2024 , 41 (9) : 1914-1920 . |
| MLA | Yu, Yaxin et al. "Design and experimental demonstration of a high-performance all-silicon transverse magnetic polarizer using tilted-elliptical-hole arrays" . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 41 . 9 (2024) : 1914-1920 . |
| APA | Yu, Yaxin , Guo, Zhenzhao , Wu, Shengbao , Xiao, Jinbiao . Design and experimental demonstration of a high-performance all-silicon transverse magnetic polarizer using tilted-elliptical-hole arrays . | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS , 2024 , 41 (9) , 1914-1920 . |
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