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Nanoscale and Quantum Materials: From Synthesis and Laser Processing to Applications 2025

作者： Lin, Yen-Ting Hsieh, Jui-Ting Tsai, Meng-Lin Yang, Chan-Shan Institute and Undergraduate Program of Electro-Optical Engineering National Taiwan Normal University Taipei Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei Taiwan Micro/Nano Device Inspection and Research Center National Taiwan Normal University Taiwan Applied High Entropy Technology Center National Cheng Kung University Tainan Taiwan

ISBN: (纸本)9781510684522

With the advancement of the global economy and technology, energy demand has become an urgent issue, prompting heightened attention to environmental friendliness and sustainable development. Solar energy, as a significant renewable resource, has garnered widespread attention despite facing challenges in conversion efficiency. Perovskite materials, due to their cubic crystal structure exhibiting excellent optoelectronic properties and a broad spectrum response, along with low manufacturing costs, have emerged as a recent research focus. These materials have shown remarkable potential in solar cells, light-emitting devices, and photodetectors, offering high efficiency, tunable bandgaps, and scalable fabrication processes. This study enhances the optical performance and stability of perovskite quantum dots through femtosecond pulse laser annealing technology, thereby improving their quantum yield. Advanced optical systems are employed for analysis, fully leveraging the advantages of perovskite materials in photovoltaic conversion. This research not only provides foundational solutions to pressing energy challenges but also promotes the transition of society towards cleaner and more sustainable energy technologies. Moreover, it contributes to the advancement of more efficient solar technologies, promoting innovation and development in future energy sources, and effectively reducing dependence on non-renewable energy. This is of significant importance for environmental protection, ensuring a better living environment for the future generations. © 2025 SPIE.

关键词： Nanocrystals

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Supplementary information for "Low-loss silicon nitride Kerr-microresonators fabricated with metallic etch masks via metal lift-off"

arXiv

引用

arXiv 2025年

作者： Colación, Gabriel M. Rukh, Lala Buck, Franco Drake, Tara E. Optical Science & Engineering Program University of New Mexico AlbuquerqueNM87106 United States Center for High Technology Materials University of New Mexico AlbuquerqueNM87106 United States Department of Physics & Astronomy University of New Mexico AlbuquerqueNM87106 United States

Stoichiometric silicon nitride has emerged as a widely used integratedphotonic material owing to its high index of refraction, nonlinear opticalproperties, and broad transparency window spanning visible to mid-IRfrequencies. However, silicon nitride is generally more resistant to reactiveion etching than are typical etch masks made of polymer-based resist. Thisnecessitates resist layers that are significantly thicker than the siliconnitride and results in mask patterns which are tall and narrow. Thesehigh-aspect-ratio patterns inhibit the plasma transport of reactive ionetching, which leads to difficulties in accurately reproducing dimensions andcreating well-defined, vertical waveguide sidewalls. In this work, we overcomethese challenges by developing a metallic etch mask that provides a 30:1nitride-to-metal etch rate ratio, representing a near 20-fold reduction in therequired mask thickness. We demonstrate the quality of this technique byetching microring resonators with near-vertical waveguide sidewalls andintrinsic quality factors of over 1 million. Leveraging the low optical loss ofour resonators, we generate optical frequency combs with more than an octave ofbandwidth and dual dispersive waves. These results establish metal lift-off asa viable and easy-to-implement technique capable of producing low optical losswaveguides. © 2025, CC BY.

关键词： Aspect ratio

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Nonsaturated large magnetoresistance and transport dynamics in a n-doped cryogenic WSe2 field-effect device

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Physical Review B 2025年第12期111卷 125307-125307页

作者： Wei-Chen Lin Ching-Chen Yeh Jia-Zhu Zou Nhat Anh Nguyen Phan Inayat Uddin Hai Yen Le Thi Kenji Watanabe Takashi Taniguchi Gil-Ho Kim Department of Engineering and System Science National Tsing Hua University Hsinchu 300 Taiwan Taiwan International Graduate Program Academia Sinica Taipei 115 Taiwan Department of Physics National Taiwan University Taipei 106 Taiwan Department of Electrical and Computer Engineering Sungkyunkwan University (SKKU) Suwon 164 Republic of Korea Sungkyunkwan Advanced Institute of Nano Technology (SAINT) Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba 305-0044 Japan

Interest in the two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) continues to intensify, driven by their suitable band gaps to supplant silicon as next-generation semiconductor materials. Among various TMDs, tungsten diselenide (WSe2) is renowned for its superior electrical properties in carrier density and mobility under ambient conditions. Despite its notable attributes, the behavior of monolayer WSe2 in the electron-doped regime under cryogenic conditions remains largely uncharted, particularly concerning its magnetotransport properties. In this study, we reveal the transport mechanisms of monolayer WSe2 from high temperatures down to the cryogenic regime. As evident by Efros–Shklovskii variable-range hopping (E-S VRH) in the cryogenic regime, strong Coulomb interactions arise between electrons. Above 8 K, an uncommon nonsaturated quadratic large magnetoresistance (MR) can be explained by the wave-function shrinkage model, which is consistent with the E-S VRH transport mechanism. Notably, the nonsaturated quadratic large MR shows a magnitude up to 1740% at 13 T. These findings underscore the potential applications for monolayer WSe2 in cryogenic field-effect devices, magnetic sensors, and memory devices and mark a significant advance in magnetotransport research.

关键词： Monolayers

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Iterative Refinement of Arbitrary Micro-optical Surfaces

arXiv

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arXiv 2025年

作者： Plummer, Meagan Taylor, Stephen Marshall, Matthew Brown, David Leonard, Robert Hyra, Seth Olson, Spencer Optical Science & Engineering Program University of New Mexico AlbuquerqueNM87131 United States Department of Physics and Astronomy University of New Mexico AlbuquerqueNM87131 United States Universities Space Research Association United States National Research Council National Academies of the Sciences United States Space Dynamics Laboratory Quantum Sensing & Timing North LoganUT84341 United States Air Force Research Laboratory Kirtland Air Force Base NM87117 United States

We introduce an adaptive optical refinement method enabling ultra-precise micro-milling of arbitrary surfaces. Through repeated iteration, our method reduces surface error without requiring significant specific surface engineering. This remediates the long sample preparation times and lack of refinement capability that previously reported methods suffer from. The iterative refinement milling method was used to produce spherical mirrors with small radii of curvature and low surface roughness for use in micro Fabry-Perot cavities. We demonstrate the use of this adaptive process to produce a variety of arbitrary surface geometries on both optical fiber tips as well as optical flats. We additionally discuss our capability to apply iterative refinement milling adaptively to various materials, including to construct GRIN lenses. © 2025, CC BY-SA.

关键词： Milling (machining)

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Ultrashort lasers: Identifying the "perfect" pulse

Ultrashort lasers: Identifying the "perfect" pulse

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Solid State Lasers XVII: Technology and Devices

作者： Bender, Daniel A. Sheik-Bahae, Mansoor University of New Mexico Department of Physics and Astronomy Optical Science and Engineering Program Albuquerque NM 87131

ISBN: (纸本)9780819470461

Sensitive, real-time chirp and spectral phase diagnostics along with full field reconstruction of femtosecond laser pulses are performed using a single rapid-scan interferometric autocorrelator. Single shot diagnostics are possible when the second-harmonic spectrum is available. A novel graphical representation distinguishes between temporal and spectral phase distortions. Examples are presented that illustrate the sensitivity and fidelity of the scheme even with low signal-to-noise.

关键词： Ultrashort pulses

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Sensitive ultrashort pulse chirp measurement

Sensitive ultrashort pulse chirp measurement

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37th Annual Boulder Damage Symposium Proceedings - Laser-Induced Damage in optical Materials: 2005

作者： Bender, Daniel A. Hasselbeck, Michael P. Sheik-Bahae, Mansoor University of New Mexico Department of Physics and Astronomy Optical Science and Engineering Program Albuquerque NM 87131 United States

No abstract available

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Self-starting passively mode-locked all fiber laser based on carbon nanotubes with radially polarized emission

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Photonics Research 2016年第6期4卷 327-330页

作者： Yong Zhou Jian Lin Xiaoqiang Zhang Lixin Xu Chun Gu Biao Sun Anting Wang Qiwen Zhan Department of Optics and Optical Engineering University of Science and Technology of China Electro-Optics Program University of Dayton

We demonstrate an all fiber passively mode-locked laser emitting a radially polarized beam by using a few-mode fiber Bragg grating to achieve mode selection and spectrum filtering. An offset splicing of single-mode fiber with four-mode fiber is utilized as a mode coupler in the laser cavity. Carbon nanotubes are introduced into the laser cavity as the saturable absorber to achieve self-start mode locking. The laser operates at 1547.5 nm with a narrow spectrum width of 0.3 nm at 30 d B. The emitted mode-locked pulses have a duration of 22.73 ps and repetition of10.61 MHz. A radially polarized beam has been obtained with high mode purity by adjusting the polarization in the laser cavity.

关键词： mode

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Thermal energy dependent transient permittivity of epsilon-near-zero material

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science China(Physics,Mechanics & Astronomy) 2022年第8期65卷 96-101页

作者： Heng Wang Lixun Sun Kang Du Wending Zhang SooJin Chua Guixin Li Ting Mei MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an710129China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen518055China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen518055China Department of Electrical and Computer Engineering National University of SingaporeSingapore117583Singapore LEES Program Singapore-MIT Alliance for Research&Technology(SMART)Singapore138602Singapore

Transparent conductive oxides exhibit attractive optical nonlinearity with ultrafast response and giant refractive index change near the epsilon-near-zero(ENZ) wavelength, originating from the intraband dynamics of conduction electrons. The optical nonlinearity of ENZ materials has been explained by using the overall-effective-mass and the overall-scattering-time of electrons in the extended Drude model. However, their response to optical excitation is yet the last building block to complete the theory. In this paper, the concept of thermal energy is theoretically proposed to account for the total energy of conduction electrons exceeding their thermal equilibrium value. The time-varying thermal energy is adopted to describe the transient optical response of indium-tin-oxide(ITO), a typical ENZ material. A spectrally-resolved femtosecond pump-probe experiment was conducted to verify our theory. By correlating the thermal energy with the pumping density, both the giant change and the transient response of the permittivity of ITO can be predicted. The results in this work provide a new methodology to describe the transient permittivities of ENZ materials, which will benefit the design of ENZ-based nonlinear photonic devices.

关键词： epsilon-near-zero optical nonlinearity transient response thermal energy hot electron indium tin oxide

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Characterization of indigo-doped poly(3-hexylthiophene):-phenyl C61-butyric acid methyl ester bulk heterojunction solar cells

Characterization of indigo-doped poly(3-hexylthiophene):-phe...

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作者： Lu, Yang-Ming Wong, Jing-Syun Hsu, Lien-Chung Master Program of Electro-Optical Engineering Department of Electrical Engineering National University of Tainan Tainan Taiwan Graduate Institute of Material Science and Engineering National Cheng Kung University Tainan Taiwan

Poly(3-hexylthiophene)/[6,6]-phenyl C61-butyric acid methyl ester bulk hetero-junction photovoltaic cells doped with indigo dye as a p-type solar collector were studied. Doping indigo increases the absorption of the visible light spectrum, as determined using ultraviolet-visible spectrophotometry analysis. The photocurrent was measured in air under a solar simulator with AM 1.5G illumination (100 mW/cm2). The best photovoltaic efficiency obtained was 2.55% after doping indigo into the cell. © 2012 Elsevier B.V.

关键词： Organic solar cells

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Fluidic intraocular lens with a large accommodation range

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IEEE Photonics Technology Letters 2009年第5期21卷 304-306页

作者： Qiao, Wen Tsai, Frank S. Cho, Sung Hwan Yan, Huimin Lo, Yu-Hwa for Optical Instrument Zhejiang University Hangzhou 310027 China Department of Electrical and Computer Engineering Jacobs School of Engineering University of California San Diego CA 92093-0407 United States Materials Science and Engineering Program Jacobs School of Engineering University of California San Diego San DiegoCA 92093-0418 United States

Fluidic lenses with tunable focal distances were experimented in a human eye model as intraocular lenses (IOLs). Fluidic IOL shows superior performance to fixed or optic-shift accommodating IOLs because of their much wider accommodation range. Our results demonstrate that fluidic IOL can achieve an accommodation range of eight diopters, equivalent to the performance of young adults. Finite-element analysis shows that the required force for the fluidic IOL to achieve the desired amount of accommodation is comparable to the force generated from ciliary muscles of human eyes, as an initial indication that an implanted fluidic IOL may be controllable by eye muscles. © 2009 IEEE.

关键词： Intraocular lenses

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