Article
Optics
Jiawei Mao, Hiromu Sato, Alisa Bannaron, Jianxun Hong, Guo-Wei Lu, Shiyoshi Yokoyama
Summary: Efficient electro-optic modulation is achieved in a hybrid silicon modulator using an EO polymer in an in-plane coplanar waveguide and electrode structure. The strong confinement of the optical field in the hybrid structure enables efficient electric poling and modulation of the EO polymer. The study investigates the volume resistivity dependence of the efficiency of electric poling and modulation for different side-cladding materials. Experimental results demonstrate the high-speed signaling capability of the device, achieving on-off-keying transmission at signal rates up to 52 Gbit/s with a high Q factor.
Article
Chemistry, Analytical
Rongbo Wu, Lang Gao, Youting Liang, Yong Zheng, Junxia Zhou, Hongxin Qi, Difeng Yin, Min Wang, Zhiwei Fang, Ya Cheng
Summary: This study demonstrates the design and fabrication of a high-performance thin-film lithium niobate electro-optic modulator using photolithography assisted chemo-mechanical etching technology. The modulator exhibits a wide bandwidth, low insertion loss, and low half wave voltage-length product, making it suitable for the development of large-scale low-loss photonic integrated devices.
Article
Optics
Nuo Chen, Kangping Lou, Yalong Yu, Xuanjian He, Tao Chu
Summary: This study proposes and demonstrates a high-efficiency lithium niobate electro-optic modulator with high-permittivity cladding, which improves the electric field strength and overlap with optical fields while maintaining low optical loss and broad bandwidth. The proposed modulator shows significant improvement in performance and modulation efficiency, providing a promising solution for integrating photonic devices on the thin-film lithium niobate platform and serving as fundamental components in future large-scale photonic integrated circuits.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Rongjin Zhuang, Jinze He, Yifan Qi, Yang Li
Summary: Thin-film lithium niobate (TFLN) has excellent optical properties and is widely used in various electro-optic and acousto-optic devices. This study developed a wet etching method for TFLN, enabling the fabrication of high-quality micro-racetracks with customized coupling conditions. The method offers high throughput, reproducibility, and cost-efficiency, showing great potential for mass production of integrated LN photonic devices.
ADVANCED MATERIALS
(2023)
Article
Optics
Ziliang Ruan, Kaixuan Chen, Zong Wang, Xuancong Fan, Ranfeng Gan, Lu Qi, Yiwei Xie, Changjian Guo, Zhonghua Yang, Naidi Cui, Liu Liu
Summary: This study introduces a SiN and LN heterogeneous integration platform that supports high-performance EO modulators on SiN waveguide circuits. An efficient evanescent coupling structure is realized for low-loss light transitions between the SiN waveguide and the LN ridge waveguide. Based on this platform, an unprecedented EO Mach-Zender interference modulator on SiN is built with remarkable loss, efficiency, and bandwidth performances.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Luyao Wang, Ilya Shadrivov
Summary: This study numerically investigates metasurfaces incorporating electro-optic materials and demonstrates their ability to achieve large amplitude and phase modulations over a fraction of the operation wavelength. The study shows that metasurfaces composed of dielectric discs on a lithium niobate film exhibit three types of resonances, namely, Fabry-Perot modes, guided modes, and Mie modes. By comparing the performance of metasurfaces in different regimes, the study finds that the strongest amplitude modulation can be achieved by exciting and re-emitting the guided modes in the substrate. Furthermore, the study reveals that for larger phase modulation while maintaining high transmission, more complex metasurfaces with at least two resonators per unit cell are required.
Article
Chemistry, Multidisciplinary
Martin Thomaschewski, Christian Wolff, Sergey Bozhevolnyi
Summary: The study demonstrates a plasmonic optical phased array (OPA) using plasmonic lithium niobate technology for efficient optical beam manipulation, achieving aliasing-free beam steering with an angular range of +/- 5 degrees, flat frequency response up to 18 GHz, and a potential bandwidth of 1.2 THz.
Article
Optics
Jing Wang, Haoru Yang, Weiwen Zou
Summary: The proposed sandwiched Si/I/LNOI modulator demonstrates a wide modulation range and robustness to fabrication deviations, with a bandwidth of around 180 GHz and a halfwave voltage of 3 V.
Article
Optics
Jiaxin Zhang, Bincheng Pan, Weixi Liu, Daoxin Dai, Yaocheng Shi
Summary: Researchers have designed a photonic crystal nanobeam cavity on an etchless LiNbO3-On-Insulator platform, utilizing photonic bound states in the continuum to achieve a high Q factor. This opens up possibilities for manufacturing high-efficiency electro-optic modulators.
Article
Optics
Xuecheng Liu, Bing Xiong, Changzheng Sun, Jian Wang, Zhibiao Hao, Lai Wang, Yanjun Han, Hongtao Li, Yi Luo
Summary: A thin film lithium niobate electro-optic modulator based on partially removed benzocyclobutene bonding layer is proposed for sub-terahertz bandwidth. This design allows for low loss microwave transmission and high electro-optic modulation bandwidth, making it suitable for sub-terahertz operation.
Article
Nanoscience & Nanotechnology
Youting Liang, Junxia Zhou, Zhaoxiang Liu, Haisu Zhang, Zhiwei Fang, Yuan Zhou, Difeng Yin, Jintian Lin, Jianping Yu, Rongbo Wu, Min Wang, Ya Cheng
Summary: Erbium doped integrated waveguide amplifiers and lasers have significant advantages in lightwave communication and large-scale sensing. This study successfully fabricated erbium-doped lithium niobate waveguide amplifiers with a thin cladding layer of Ta2O5, which achieved higher optical gain.
Article
Optics
Han Zhao, Alkim Bozkurt, Mohammad Mirhosseini
Summary: Interfacing electronics with optical fiber networks is crucial for long-distance transfer of classical and quantum information. Despite challenges with hybrid material integration and increased loss in piezoelectric materials, this research demonstrates an alternative approach using silicon-based devices for efficient microwave-to-optical photon conversion. The experiment achieved a conversion efficiency of 1.72 +/- 0.14 +/- 10(-7) in a 3.3 MHz bandwidth, showcasing the potential for integrated quantum transduction with crystalline silicon devices.
Article
Engineering, Electrical & Electronic
Lingyun Yu, Jumei Shang, Kaiwen Luo, Qijing Lin, Huajiang Chen, Wentao Qiu, Heyuan Guan, Huihui Lu
Summary: Improving the performance of mid-infrared (mid-IR) electro-optic (EO) modulators is crucial for applications in optical communication and gas molecular detection. This study presents the theoretical design and performance analysis of a high-speed mid-IR EO modulator based on lithium niobate on insulator (LNOI) at a wavelength of 3 μm. The designed device features key components such as single-mode ridge waveguides, 1x2 multimode interference (MMI) couplers, and coplanar waveguide (CPW) electrodes, achieving an extinction ratio greater than 40 dB, a half-wave voltage-length product of approximately 12 V·cm, and an EO bandwidth of up to 12 GHz.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Ying Pan, Mingbo He, Mengyue Xu, Zhongjin Lin, Yanmei Lin, Wei Ke, Jie Liu, Zhenrui Lin, Yuntao Zhu, Shenqian Gao, Hao Li, Xiaoyue Liu, Chuan Liu, Siyuan Yu, Xinlun Cai
Summary: This article introduces a compact polarization-insensitive electro-optic modulator based on substrate-removed thin-film lithium niobate technology, which allows the laser and modulator to be connected with a standard single-mode fiber at different locations. It is of great significance for 5G and future 6G wireless networks.
Article
Chemistry, Multidisciplinary
Yao Ju, Hao Zhou, Yulei Huang, Yin Zhao, Xin Deng, Zuogang Yang, Fangjie Wang, Qiongqiong Gu, Guoliang Deng, Haoyi Zuo
Summary: We proposed a free space light modulator based on a gold grating metasurface on lithium niobate (LiNbO3), which can control light properties arbitrarily over a wide wavelength range. The metasurface achieved quasi-bound states in the continuum (quasi-BIC). Furthermore, plasmonic quasi-BIC and guided-mode resonance (GMR) can be modulated by controlling the polarization of the incident light without any geometric adjustment. The results showed potential for applications such as near-infrared imaging, beam steering, and free-space optical communication links.
