Article
Polymer Science
Eun-Su Lee, Kwon-Wook Chun, Jinung Jin, Min-Cheol Oh
Summary: Polymer waveguide phase modulators are important for optical phased array devices due to their thermal isolation and high thermo-optic effect. In this study, a waveguide phase modulator based on a high-refractive-index fluorinated polyimide was designed and fabricated. The performance of the modulator, including propagation loss, temporal response, and transfer function, was characterized.
Article
Chemistry, Multidisciplinary
Xiao Liu, Meiling Zhang, Guijun Hu
Summary: Si3N4 slot waveguide has the ability to tightly confine light and weak absorption of 980 nm pump light, making it suitable for waveguide amplification. This study proposed the integration of an optical waveguide amplifier based on Er3+ and Yb3+ codoped with a Si3N4 slot to increase gain. By filling the slot with core-shell NaYF4/NaLuF4: 20%Yb3+, 2%Er3+ nanocrystals, a high-efficiency emission at 1.53 μm under 980 nm laser excitation was achieved. Numerical simulations showed a net gain of 8.2 dB, providing new ideas and directions for waveguide amplifiers.
Article
Optics
Ian Yulianti, N. M. Darma Putra, Fianti, A. L. Dewi, D. Paradita
Summary: The study investigated the refractive index and temperature response of UPR/PMMA based waveguides, showing good RI sensitivity and linearity, with temperature dependency observed.
Article
Optics
Clement Deleau, Han Cheng Seat, Olivier Bernal, Frederic Surre
Summary: In this study, a high-sensitivity integrated silicon nitride long period grating (LPG) refractometer based on a rib waveguide with sinusoidally modulated width is demonstrated. The sensor exhibits a very high refractometric sensitivity that remains constant over a broad spectral range and also has low temperature sensitivity and a simple fabrication process. These results demonstrate the feasibility of achieving both high sensitivity and a large dynamic range of the proposed refractometer through chip-scale photonic integration.
PHOTONICS RESEARCH
(2022)
Article
Optics
Christopher Flynn, Haimu Cao, Brian E. Applegate, Tomasz S. Tkaczyk
Summary: Advances in 2-photon lithography have allowed for the production of sub-micron resolution and millimeter scale 3D optical components in the lab. This technology is well-suited for rapid prototyping and production of waveguide structures, interconnects, and waveguide directional couplers, promoting the development and miniaturization of waveguide-based imaging technologies. System alignment is inherent to the 2-photon process, eliminating the need for manual assembly and enabling precise micron scale waveguide geometries. The use of 2-photon lithography for printing multi-mode waveguide couplers with air cladding and single mode waveguide couplers with uncured liquid photoresin cladding is demonstrated.
Article
Engineering, Electrical & Electronic
Maxim Neradovskiy, Herve Tronche, Dmitry Chezganov, Elena Pashnina, Evgeniy Vlasov, Pascal Baldi, Tommaso Lunghi, Vladimir Shur, Florent Doutre, Marc De Micheli
Summary: This paper proposes an alternative technique based on the characterization of the second harmonic generation signature of a nonlinear waveguide, which can be used to study the refractive index profile of waveguides, including the high-order spatial modes, which are important for probing the distribution of waveguides.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Cheng Peng, Changjin Yang, Huan Zhao, Lei Liang, Chuantao Zheng, Chen Chen, Li Qin, Hui Tang
Summary: This study presents the principles and designs of optical waveguide refractive index sensors, which generate different optical resonances for detecting concentration. The study focuses on analyzing the structural characteristics and performance indicators of microring sensors and interferometers based on the refractive index of the waveguide. The sensing mechanisms of these sensors and their classification based on waveguide materials and substances to be measured are also discussed, along with a comparison of performance indicators. Additionally, the applications of refractive index sensing in the biochemical field demonstrate the advantages of optical waveguide refractive index sensors over other types.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Analytical
Tayebeh Sahraeibelverdi, L. Jay Guo, Hadi Veladi, Mazdak Rad Malekshahi
Summary: Polymer ring resonators with partially tapered waveguides were studied for biomedical sensing, aiming to improve sensitivity and figure of merit. By gradually reducing waveguide width and increasing the number of tapered segments, sensitivity was enhanced and the figure of merit improved to close to six tapered segments in a π/4 tapered ring.
Article
Polymer Science
Fan Zhang, Jinhui Li, Tao Wang, Chao Huang, Fei Ji, Liang Shan, Guoping Zhang, Rong Sun, Ching-ping Wong
Summary: This study introduced an effective approach to fabricate novel fluorinated graphene/polyimide nanocomposite films, and investigated the effects of different loading amounts of fluorinated graphene on the film properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Jian-Jun He, Hai-Xia Yang, Feng Zheng, Shi-Yong Yang
Summary: Fluorinated aromatic polyimide (FAPI) films with rigid polymer backbones were prepared by chemical imidization approach. These films exhibited excellent mechanical properties, thermal stability, and transparency, as well as stable electrical properties in high frequency range.
Article
Optics
Hongqiang Li, Wentao Meng, Lu Cao, Lizhen Zhang, Yang Liu, Zhilin Lin, Ruina Zhao, Zhenya Song, Feng Ren, Shanshan Zhang, Liying Chen, Jinjun Bai, Mengwei Cao, Yingjie Wang, Zhiyue Zhu, Tianxue Gao, Enbang Li, Joan Daniel Prades
Summary: This paper proposes a polymer-based optical waveguide pressure sensor that can be used for medical diagnostics and health testing. The sensor has the advantages of low cost, low Young's modulus, and high sensitivity, and characterizes the change in pressure by measuring the change in Bragg wavelength.
Article
Optics
Yajie Liu, He Tian, Xinyi Zhang, Mingyu Wang, Yu Hao
Summary: This paper proposes a metal-insulator-metal (MIM) waveguide structure for generating quadruple Fano resonances. The resonant wavelengths of the quadruple Fano resonances can be almost independently tuned by changing the structural parameters of the three cavities. The MIM waveguide structure demonstrates excellent refractive index sensing performance and simultaneous multisolution concentration sensing capability, promoting its applications in integrated optical sensing.
Article
Engineering, Multidisciplinary
Jaroslaw Judek, Konrad Wilczynski, Jerzy K. Piotrowski
Summary: This paper constructs and analyzes the strict optical model of a quartz cuvette filled with investigated liquid commonly used in spectrophotometry. The study evaluates the impact of popular approximations on the calculation accuracy and demonstrates the validity of a method involving standardizing transmittance for calculations.
Article
Optics
Jae-Sang Lee, Yong-Jin Kim, Seong-Hyeon Cho, Byeong-Tak Park, Woo June Choi, Young-Wan Choi
Summary: In this work, a multi-mode resonator based on SU-8 polymer is presented and it is experimentally verified that the resonator with mode discrimination can be used as a high-performance sensor. The fabricated resonator shows sidewall roughness, which is usually considered undesirable. The effect of sidewall roughness is analyzed through resonator simulation and mode discrimination still occurs even with the roughness. Additionally, the controllable waveguide width achieved through UV exposure time contributes effectively to mode discrimination. The resonator is further verified as a sensor with a temperature variation experiment, showing a high sensitivity of about 630.8 nm/RIU. This result indicates that the multi-mode resonator sensor fabricated through a simple process is competitive with other single-mode waveguide sensors.
Article
Polymer Science
Yulong Li, Teng Chen, Yang Liu, Xiangyang Liu, Xu Wang
Summary: One of the challenges for polyimide (PI) insulators is to achieve high breakdown strength and low dielectric loss. In this study, the addition of fluorinated graphene (FG) successfully improved the breakdown strength and reduced the dielectric loss of the PI film. The experimental results suggest that the cross-linking structure plays a significant role in optimizing the dielectric performance of PI/FG films.
