Article
Materials Science, Multidisciplinary
Hongli Zhang, Cui Yang, Hua Zhong, Feng Wang, Gang Zou
Summary: Flexibility and stimulus-response phosphorescent waveguides are rarely studied in photonics and optoelectronics devices. This study develops one-dimensional phosphorescent microfibers and demonstrates their attributes as phosphorescent waveguides. The study also shows a strategy to achieve flexible phosphorescent waveguides with tunable tip emission, which has promising applications in designing optical functional elements and manufacturing intelligent flexible photonic devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiahe Li, Yifan Xie, Zeyu Feng, Chutian Zhang, Hongli Zhang, Xin Chen, Gang Zou
Summary: We demonstrate a simple and scalable method to fabricate macroscopic chiral assemblies of Ag nanowires in poly(vinyl alcohol). These nanocomposites can convert achiral fluorescence into circularly polarized luminescence, with the handedness depending on the stirring direction and spectral overlapping. The orientation and optical activity of the Ag nanowires assemblies can be reversibly modulated during mechanical stretching and shape recovery processes. Inkjet printing technology can be used to easily fabricate flexible and programmable circularly polarized luminescence patterns. This method provides a new avenue for rational designs and applications of smart chiroptical devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Optics
Hiroshi Yamagishi, Keitaro Fujita, Junnosuke Miyagawa, Yuya Mikami, Hiroaki Yoshioka, Yuji Oki, Naoki Takada, Soumei Baba, Shimpei Saito, Satoshi Someya, Zhan-Hong Lin, Jer-Shing Huang, Yohei Yamamoto
Summary: A simple methodology is reported to form a self-standing spherical microlaser that is composed fully of liquid and operates steadily even under atmosphere. The droplets are highly robust and work as efficient long-lasting laser oscillators. The lasing wavelength is sensitively shifted when the droplets are subjected to a faint breeze or moisture.
LASER & PHOTONICS REVIEWS
(2023)
Article
Multidisciplinary Sciences
Ang Li, Yeshaiahu Fainman
Summary: In this study, an ultra-compact single-shot spectrometer on silicon platform is presented for sparse spectrum reconstruction. It consists of 32 stratified waveguide filters with diverse transmission spectra for sampling the unknown spectrum of the input signal. The fabricated spectrometer demonstrates broad operating bandwidth and narrowband peaks that can be clearly resolved. Compact spectrometers with simple design can enable various applications in optical spectral bands.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Pavel Loiko, Ludovic Gauthier-Manuel, Gurvan Brasse, Alain Braud, Abdelmjid Benayad, Patrice Camy
Summary: Channel waveguides with high aspect ratio are produced in Yb3+:CaF2 crystals by deep diamond saw dicing, exhibiting good verticality and low propagation losses. A Yb3+:CaF2 waveguide laser shows high slope efficiency, low laser threshold, slightly multimode laser output, and continuous wavelength tuning between 1009 and 1072 nm. The developed waveguides have potential for compact and integrated mode-locked sources at around 1 µm.
Article
Optics
Hyung San Lim, Ju Hyuk Lee, Heon Yong Jeong, Sung Oh Cho
Summary: This study introduces a simple one-step approach for producing DFB lasers by selectively irradiating the gain medium MEH-PPV. Electron irradiation can create a periodic diffraction grating, allowing for low lasing threshold and tunable laser wavelength.
Article
Materials Science, Ceramics
Yani Zhang, Yijing Zhao, Qi Chen, Yi Hou, Qing Zhang, Laifei Cheng, Lianxi Zheng
Summary: In this study, multiwall carbon nanotubes were introduced into silicon carbide to enhance its electrical properties and prepare flexible 2D CNTs loaded SiC fiber mats as microwave absorbers, achieving high flexibility and improved microwave absorption properties. The electromagnetic absorption performance can be adjusted by tuning the CNT content and material thickness, with an effective absorption bandwidth covering the entire X-band.
CERAMICS INTERNATIONAL
(2021)
Article
Optics
Jun Ye, Chenchen Fan, Jiangming Xu, Hu Xiao, Jinyong Leng, Pu Zhou
Summary: This study demonstrated a 2-kW-level wavelength and linewidth tunable superfluorescent fiber source, achieved through seed source and fiber amplifier stages. Numerical simulation showed that the tuning ranges of wavelength and linewidth are influenced by different factors.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2021)
Article
Optics
Yujie Xiong, Shixiang Wang, Zhixiang Chen, Xiaoli Sun, Hongliang Liu, Yuechen Jia, Feng Chen
Summary: Waveguide lasers with compact packages have gained significant interest in recent years due to the development of integrated photonics and demand for miniaturized photonic devices. This study utilizes femtosecond laser direct writing (FsLDW) technology to fabricate cladding waveguides in Tm:YLF crystal. A low-threshold waveguide laser at 1877 nm is achieved using a Ti:sapphire laser pump at 779 nm. In addition, a pulsed Q-switched Tm:YLF waveguide laser is demonstrated by employing a Bi2Se3-based saturable absorber (SA) element. The experimental results highlight the potential of Tm:YLF and FsLDW in constructing compact mid-infrared lasers.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
He Pan, Wen-Hui Shi, Zi-Xuan Zhang, Liao-Lin Zhang, Chun-Xiao Liu
Summary: The three spectroscopic parameters of Dy:LPS were calculated using the Judd-Ofelt theory, and a planar waveguide was fabricated on Dy:LPS by proton implantation. The dark-mode spectrum was obtained using the prism coupling method, and the refractive index profile of the waveguide structure was reconstructed using RCM. The mode profile of the waveguide was investigated using the end-face coupling technique. The study suggests that Dy:LPS crystal and its waveguide structure have potential applications in integrated optics, especially in the fabrication of solid-state waveguide lasers.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Zhiyi Yuan, Xiaotian Tan, Xuerui Gong, Chaoyang Gong, Xin Cheng, Shilun Feng, Xudong Fan, Yu-Cheng Chen
Summary: This study presents a novel concept of bioresponsive microlasers by utilizing interfacial energy transfer based on whispering-gallery-mode (WGM) microdroplet cavities. Manipulation of lasing wavelengths was achieved through changes in gain spectrum induced by energy transfer from binding molecular concentrations at the cavity surface. Tunable lasing wavelengths across a broad spectral range were demonstrated by selecting different donor/acceptor pairs, opening up new avenues for biodetection and providing insights into molecular modulation of laser light at the biointerface for the development of smart bio-photonic devices at the molecular level.
Article
Optics
Mohammad Ahmadi, Wei Shi, Sophie LaRochelle
Summary: This study demonstrates a high-performance tunable Raman laser on a sub-micrometer-thick silicon wafer, achieving a large wavelength tuning range of 83 nm by adjusting coupling coefficients. The efficient on-chip nonlinear wavelength conversion of this Raman laser indicates the potential for significantly increasing optical spectral resources on a silicon chip.
Article
Physics, Applied
Fangyuan Liu, Tuyu Yin, Yu Liu, Iqbal Naeem, Dan Guo, Libin Cui, Tianrui Zhai
Summary: In this work, multiple-beam colloidal quantum dot lasers are achieved in a double waveguide-grating (W-G-W) microcavity using interference lithography. The low-threshold multiple-beam laser output with emission peaks at 664.6 and 645.2 nm is realized under optical pumping. The presence of quasi-propagation modes provides a method for designing compact laser sources.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Pinghua Tang, Yuchen Wang, Edoardo Vicentini, Francesco Canella, Lisa Marta Molteni, Nicola Coluccelli, Paolo Laporta, Gianluca Galzerano
Summary: We present a handheld Dy-doped ZBLAN fiber laser that can be pumped by hand, with tunable emission wavelength in the mid-IR range and capable of single-frequency operation. By utilizing an intracavity germanium etalon and a reflective diffraction grating, we achieved single-frequency operation with emission linewidth narrower than 110 kHz and relative intensity fluctuations at a level of 0.9% over a wide integration bandwidth.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Xintao Zeng, Hongji Wang, Ziming Hong, Yuxin Ma, Canfeng Zhu, Pinghui Wu, Xianzeng Zhang, Yuechun Shi, Xiangfei Chen
Summary: A new structure for the equivalent realization of curved waveguide Bragg grating is proposed and experimentally demonstrated. The results show that the proposed method can achieve the alteration of the grating at a micro-scale and compensate for the difference in light response.
