Article
Materials Science, Multidisciplinary
Honghu Zhang, Qingyun Li, Houbin Zhu, Hui Hu
Summary: This paper investigates the periodic poling process of lithium niobate thin film and solves the problem by using repeated poling. With 6 repeated poling processes, the poling fidelity reaches nearly 100% for a periodicity of 3.8 pm, providing useful information for achieving high-fidelity poling in lithium niobate.
Review
Materials Science, Multidisciplinary
Ran-Ran Xie, Gui-Qin Li, Feng Chen, Gui-Lu Long
Summary: This paper reviews recent advances in microresonators based on LN thin films, covering fabrication/characterization techniques and various applications such as frequency conversion, electro-optic modulation, frequency combs, and quantum photonics. A short summary and perspective are provided to suggest possible research topics related to LN thin-film.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
B. N. Slautin, H. Zhu, V. Ya Shur
Summary: In this study, the creation of stripe domain structures with submicron periods by local switching using a biased tip of a scanning probe microscope on LNOI was investigated. It was found that the width of isolated stripe domains and duty cycle of PPLN could be controlled by varying the applied voltage. Three types of domain width dependences on the period were identified, namely widening, constriction, and merging. Additionally, the stability of PPLN in LNOI was confirmed and domain structures could be locally removed using a biased tip, providing valuable insights for nanodomain engineering.
Article
Crystallography
Namrata Dewan Soni, Jyoti Bhola
Summary: This study introduces the first-ever optimized surface acoustic wave (SAW) device based on Beryllium Oxide (BeO) thin film, and theoretically examines the feasibility of SAW devices with BeO/128 degrees YX LiNbO3 layered structure. The calculated results show that the BeO/128 degrees YX LiNbO3 layered structure demonstrates optimal phase velocity and coupling coefficient when the BeO over layer thickness reaches 0.08 lambda, and temperature stability can be achieved by integrating it with a negative temperature coefficient of delay (TCD) TeO3 over layer.
Article
Nanoscience & Nanotechnology
Valerie Yoshioka, Jian Lu, Zichen Tang, Jicheng Jin, Roy H. Olsson, Bo Zhen
Summary: Silicon photonics has enabled large-scale production of integrated optical devices for various applications, but faces challenges when used in nonlinear devices. Scandium-doped aluminum nitride thin films exhibit enhanced optical second-order susceptibility, offering potential advantages for developing CMOS-compatible devices with strong nonlinearity.
Article
Optics
Peng Yang, Siwei Sun, Haiyun Xue, Qi Zheng, Huimin He, XiangXu Meng, Fengman Liu, Liqiang Cao
Summary: Recently, researchers have proposed a high coupling efficiency and scalable edge coupler for lithium niobate on insulator (LNOI) devices. This coupler consists of a silica-based planar lightwave circuit (PLC) and an LN bilayer taper, which enables efficient optical coupling between LNOI waveguide and fiber. The simulation results demonstrate low coupling losses for both TE and TM modes when coupled to an ultra-high numerical aperture fiber (UHNA), making this coupler suitable for high-bandwidth, multi-channel systems. This innovation paves the way for lithium niobate photonic integration circuit (PIC) and low-cost optical packaging.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Luying Yin, Jie Jiang, Yanyan Huo, Shuyun Wang, Tingyin Ning
Summary: The third-order nonlinear optical properties of niobium-rich lithium niobite (LN) thin films prepared by magnetron sputtering and annealed in high-purity oxygen exhibit reverse saturation absorption and self-focusing behaviors. The nonlinear refractive index gamma and absorption coefficient 13 are significantly influenced by the atom composition and incident wavelength. These findings are important for LN-based integrated on-chip photonic devices.
Article
Physics, Applied
Mengting Si, Chengli Wang, Can Yang, Wei Peng, Lixing You, Zhongxu Li, Hui Zhang, Jia Huang, You Xiao, Jiamin Xiong, Lu Zhang, Yiming Pan, Xin Ou, Zhen Wang
Summary: By depositing NbN superconducting films on different types of LN substrates, it was found that different LN substrates have different thickness dependencies on NbN films' T(c), delta T(c), and residual resistance ratios. By evaluating the cutting selection, it was concluded that X-cut and Y-cut LN are more suitable as a platform for integrated LN photonic chips.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Rawan B. Fadhil, Evan T. Salim, Wafaa K. Khalef
Summary: Chemical bath deposition technique was utilized to fabricate lithium niobate nanostructures, and the effect of chemical interaction time on their structural and surface properties was investigated.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Crystallography
Qingyun Li, Honghu Zhang, Houbin Zhu, Hui Hu
Summary: In this study, single-crystal lithium niobate thin films (LNOI) were prepared by two methods and their lattice properties were studied using HRXRD and confocal Raman spectroscopy. The results showed a regular crystal lattice arrangement of the LNOIs and their electrical performance parameters were close to LN bulk material, providing useful information for LNOI fabrication and photonic devices.
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
Houbin Zhu, Qingyun Li, Huangpu Han, Zhenyu Li, Xiuquan Zhang, Honghu Zhang, Hui Hu
Summary: By combining the advantages of silicon's excellent electronics properties and mature micro-processing technology with the excellent optical properties of lithium niobate, a potentially promising material platform for photonic integrated circuits has been created. A 3-inch wafer-scale hybrid mono-crystalline Si/LN thin film was successfully fabricated using ion-implantation and wafer-bonding technologies. Characterization techniques such as high-resolution transmission electron microscopy, secondary-ion mass spectroscopy, X-ray diffraction, and Raman measurements were used to investigate the crystal-lattice arrangement, H-atom-concentration distribution, and lattice properties of the Si/LN thin films. The optical propagation loss of Si strip-loaded straight waveguides at 1550 nm was found to be 6 dB/cm for the quasi-TE mode. The characterization results provide valuable information about this hybrid material platform.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
Wenqing Sun, Yi Liu, Carolina Romero, Javier R. Vazquez de Aldana, Feng Ren, Yuechen Jia, Xiaoli Sun, Feng Chen
Summary: In this paper, a novel approach to realize a Q-switched vortex waveguide laser using lithium niobate thin films and embedded silver nanoparticles is proposed and investigated. By integrating this vortex laser into a resonator, high repetition rate and narrow pulse duration are achieved. This work demonstrates the potential applications of LNOI thin films towards on-chip integration of vortex waveguide laser sources.
Article
Optics
Wenqing Sun, Yi Liu, Carolina Romero, Javier R. Vazquez de Aldana, Feng Ren, Yuechen Jia, Xiaoli Sun, Feng Chen
Summary: In this paper, a novel approach to achieve a Q-switched vortex waveguide laser by incorporating integrated lithium niobate thin films with embedded silver nanoparticles is proposed. The saturable absorption characteristics of the embedded silver nanoparticles are investigated, and the Niobate-on-insulator thin films are integrated into a Nd:YAG ear-like cladding waveguide platform. The successful realization of a high repetition rate and narrow pulse duration passive Q-switched vortex laser demonstrates the potential applications of lithium niobate thin films in on-chip integration of vortex waveguide laser sources.
Article
Nanoscience & Nanotechnology
Bong-Rim Shin, In Cheol Yu, Myeong-Hoon Shin, Mojca Jazbinsek, Fabian Rotermund, O-Pil Kwon
Summary: In this study, efficient organic THz wave generators, 2-(4-hydroxystyryl)-1-methylquinolinium 4-bromobenzenesulfonate (OHQ-BBS) single crystals, were reported. The OHQ-BBS crystals exhibit a wide molecular vibrational mode-free range in the THz frequency region with low absorption. By optical rectification, the OHQ-BBS crystals generate extremely broad, dimple-free THz waves and achieve a higher THz electric field compared to the widely used ZnTe inorganic crystal.