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Ultra-low loss silicon nitride becomes even cooler

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Light(Science & Applications) 2024年第10期13卷 1997-1999页

作者： Dawn T.H.Tan Xavier X.Chia photonics devices and systems group Singapore University of Technology andDesignSingaporeSingapore institute of Microelectronics Agency for Science Technology and Research(A*STAR)SingaporeSingapore

Ultra-low loss silicon nitride realized using deuterated precursors and low thermal budgets well within backend-of-line CMOS processing may accelerate widespread proliferation of their use.

关键词： low budget nitride

Design of high performance multi-notch filters based on photonic crystal nanorod flower-shaped resonators

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Optoelectronics Letters 2025年

作者： YAN WEI ZHANG SHUANGGEN ZHANG WEIWEI Tianjin Key Laboratory of Film Electronic and Communication devices， Engineering Research Center of Optoelectronic devices and Communication Technology， Ministry of Education， School of Integrated Circuit Science and Engineering， Tianjin University of Technology

Photonic crystal notch filter plays a vital role in photonics applications which can selectively attenuate the unwanted interference. However， it remains challenging to achieve high efficiency and is generally limited to the single notch performance. Here， we demonstrated a high efficient all-silicon multi-notch filter scheme utilizing photonic crystal nanorod flower-shaped resonators. Based on the single resonant cavity， the dielectric columns can be introduced to create the intracavity asymmetry achieving double notch， meanwhile by adding the certain scattering nanorods to trap light efficiently， it can also obtain triple notch. The results emanate that the transmission and the Q of single notch up to 2.6% and 16209.4， double notch 0.5%， 0.1% and 12371.7，13934.5， triple notch 0.2%， 0.5%， 2.3%， 2312.9， 2062.8， 2327.4 can be achieved， respectively. The proposed high efficient multi-notch filters could potentially catalyze advancements in filter technology within the realm of silicon photonics applications and optical communication.

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Ultrafast pulse-dilation framing camera and its application for time-resolved X-ray diagnostic

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Nuclear Science and Techniques 2024年第7期35卷 101-114页

作者： Hou-Zhi Cai Qiu-Yan Luo Kai-Xuan Lin Xuan Deng Jun-Kai Liu Kai-Zhi Yang Dong Wang Jia-Jie Chen Jia-Heng Wang Jing-Hua Long Li-Hong Niu Yun-Fei Lei Jin-Yuan Liu Key Laboratory of Optoelectronic devices and systems of Ministry of Education and Guangdong Province Shenzhen Key Laboratory of Photonics and BiophotonicsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060China

An ultrafast framing camera with a pulse-dilation device,a microchannel plate(MCP)imager,and an electronic imaging system were *** camera achieved a temporal resolution of 10 ps by using a pulse-dilation device and gated MCP imager,and a spatial resolution of 100μm by using an electronic imaging system comprising combined magnetic *** spatial resolution characteristics of the camera were studied both theoretically and *** results showed that the camera with combined magnetic lenses reduced the field curvature and acquired a larger working area.A working area with a diameter of 53 mm was created by applying four magnetic lenses to the ***,the camera was used to detect the X-rays produced by the laser-targeting *** diagnostic results indicated that the width of the X-ray pulse was approximately 18 ps.

关键词： Inertial confinement fusion Plasma diagnostics Framing camera Combined lenses Pulse-dilation

3D printed on-chip microtoroid resonators and nested spiral photonic devices

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photonics Research 2021年第9期9卷 1803-1810页

作者： HONGWEI GAO GEORGE F.R.CHEN PENG XING JU WON CHOI DAWN T.H.TAN photonics devices and systems group Singapore University of Technology and DesignSingapore 487372Singapore Institute of Microelectronics A*STARSingapore 138634Singapore

An integrated polymer microtoroid resonator system fabricated using single-step,two-photon polymerization laser lithography is *** integrated microtoroid-waveguide system includes an integrated coupling waveguide for ease of optical coupling and has a quality factor of 16,*** further demonstrate a nested doublespiral waveguide that allows higher spatial density of data,akin to a macroscopic form of space-division *** characterization reveals good transmission properties in the double-spiral waveguide *** addition,the waveguides are demonstrated to support 30 Gb/s nonreturn-to-zero and 28 Gb/s pulse amplitude modulation 4 high-speed data.

关键词： Gb/s waveguide resonator

Intermolecular hydrogen-bonding as a robust tool toward significantly improving the photothermal conversion efficiency of a NIR-II squaraine dye

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Chinese Chemical Letters 2024年第4期35卷 310-315页

作者： Songtao Cai Liuying Wu Yuan Li Soham Samanta Jinying Wang Bing Liu Feihu Wu Kaitao Lai Yingchao Liu Junle Qu Zhigang Yang Center for Biomedical photonics&Key Laboratory of Optoelectronic devices and systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

The photothermal therapy(PTT) has come across as a promising noninvasive therapeutic strategy for tumor treatment. However, low photothermal conversion efficiency(PCE) and hydrophobicity may impede the therapeutic efficacy of organic photothermal agents and an efficient PTT-agent must overcome these two major challenges. In this work, we developed a new strategy to promote higher PCE wherein the intermolecular hydrogen-bonding interaction between the single dye molecule and water facilitated the transformation of the absorbed energy into the heat. A hydrophilic squaraine dye(SCy1) with the second near-infrared region(NIR-II) absorption and extremely low emission were designed to exhibit much higher PCE than that of the analogues of pentamethine-dyes(PCy1, PCy2). The presence of the ‘–O-' at middle of squaric cycle enabled the intermolecular H-bonding formation between the SCy1 and water to promote the energy dissipation channel. Moreover, the introduction of long-chain phenylsulfonate groups helped in to improve the water solubility apart from serving as an additional means of further enhancing PCE through fluorescence quenching. Therefore, SCy1 with a squaraine backbone and long-chain sulfonate moieties revealed outstanding photothermal stability and anti-aggregation activity apart from showing exceptionally high PCE(74%) in water. SCy1 demonstrated excellent therapeutic efficacy when applied in the PTT treatment of tumor-bearing mice under a laser irradiation of 915 nm.

关键词： Squaraine-based cyanine Hydrogen bonds High PCE Anti-aggregation Photothermal therapy

Ultra-high suppression microwave photonic bandstop filters

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Chinese Science Bulletin 2014年第22期59卷 2684-2692页

作者： David Marpaung Blair Morrison Mattia Pagani Ravi Pant Benjamin J.Eggleton Centre for Ultrahigh Bandwidth devices for Optical systems (CUDOS) the Institute of Photonics and Optical Sciences (IPOS) School of Physics University of Sydney Sydney NSW 2006 Australia

A bandstop radio frequency(RF)filter can enhance the capabilities of RF communication systems by removing unwanted signal components such as distortion,or *** modern cognitive radio systems,frequency agile filters are desired to block interferers with dynamically changing frequencies and *** filters should be tunable over a broad frequency range,and they should be capable of suppressing very strong signals with a high *** simultaneously meet these requirements with traditional RF filters are highly *** photonic(MWP),a technology that primary deals with the generation,distribution,and processing of high speed RF signals using photonic techniques and components,is promising for creating frequency agile RF ***,traditional MWP filters are lacking the high resolution and peak suppression exhibited by state-ofthe-art RF electrical *** recently introduced a new class of MWP notch filter which is free from this *** scheme allowed the creation of anomalously high suppression MWP notch filter from virtually any kind of optical resonance,irrespective of its type(gain or absorption),or its *** enabled,for the first time,simultaneous optimization of the MWP filter resolution,peak attenuation,and frequency tuning *** this paper,we present the analysis of notch filter response creation using the novel sideband processing *** thenshow the applicability of this technique to a wide range of optical *** compare simulated and experimental results of the notch filter response created using three types of optical filter commonly used in MWP signal processing,namely stimulated Brillouin scattering(SBS),an integrated optical ring resonator(ORR),and a phase-shifted fiber Bragg-grating(FBG).

关键词： RF滤波器微波光子陷波滤波器光学滤波器受激布里渊散射 RF信号光子技术频率捷变

Supercontinuum generated in all-normal dispersion photonic crystal fibers with picosecond pump pulses

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Chinese Physics B 2013年第7期22卷 208-213页

作者：李磐时雷毛庆和 Anhui Provincial Key Laboratory of photonics devices and Materials Anhui Institute of Optics and Fine MechanicsChinese Academy of Sciences

The supercontinuum （SC） generation in all-normal dispersion （ANDi） photonic-crystal fiber （PCF） pumped by high power picosecond pulses are investigated in this paper. Our results show that an octave SC may be achieved by pumping the ANDi PCF with picosecond pump pulses. However, the PCF length required may have to be lengthened to several tens of centimeters, which is much longer than that with femtosecond pump pulses. The relatively long PCF gives rise to much higher Raman gain and stronger Raman frequency shift compared to those with femtosecond pump pulses, which in turn not only cause a distorted temporal waveform and an un-flattened spectrum, but also severely degrade the coherence of the generated SC.

关键词： supercontinuum generation photonic crystal fibers optical wave breaking

Low-power STED nanoscopy based on temporal and spatial modulation

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Nano Research 2022年第4期15卷 3479-3486页

作者： Luwei Wang Yue Chen Yong Guo Weixin Xie Zhigang Yang Xiaoyu Weng Wei Yan JunleQu Center for Biomedical photonics&College of Physics and Optoelectronic Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China

Stimulated emission depletion(STED)nanoscopy enables the visualization of subcellular organelles in unprecedented ***,reducing the power dependency remains one of the greatest challenges for STED imaging in living ***,we propose a new method,called modulated STED,to reduce the demand for depletion power in STED imaging by modulating the information from the temporal and spatial *** this approach,an excitation pulse is followed by a depletion pulse with a longer delay;therefore,the fluorescence decay curve contains both confocal and STED photons in a laser pulse *** time-resolved detection,we can remove residual diffraction-limited signals pixel by pixel from STED photons by taking the weighted difference of the depleted ***,fluorescence emission in the periphery of an excitation spot is further inhibited through spatial modulation of fluorescent signals,which replaced the increase of the depletion power in conventional *** demonstrate that the modulated STED method can achieve a resolution of<100 nm in both fixed and living cells with a depletion power that is dozens of times lower than that of conventional STED,therefore,it is very suitable for long-term superresolution imaging of living ***,the idea of the method could open up a new avenue to the implementation of other experiments,such as light-sheet imaging,multicolor and three-demensional(3D)super-resolution imaging.

关键词： fluorescence microscopy super-resolution imaging stimulated emission depletion fluorescence lifetime signal modulation

Observations of intracellular second-harmonic generation imaging in black phosphorus nanosheets

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Journal of Innovative Optical Health Sciences 2021年第2期4卷 11-18页

作者： Xiao Peng Yiwan Song Zheng Peng Kaixuan Nie Hao Liu Yingxin Zhou Feifan Zhou Yufeng Yuan Jun Song Junle Qu Center for Biomedical Optics and photonics(CBOP)&College of Physics and Optoelectronic Engineering Key Laboratory of Optoelectronic devices and systems of Ministry of Education and Guangdong Province Shenzhen University Shenzhen 518060P.R.China

Functionalized black phosphorus(BP)nanosheets have been considered as promising nanoagents in cancer therapy due to their excellent photothermal conversion ***,it is still difficult to visually monitor the dynamic localization of BP nanoagents in cancer *** this paper,we systematically studied the second-harmonic generation(SHG)signals originating from exfoliated BP ***,under the excitation of a high frequency pulsed laser at 950 nm,the SHG signals of BP nanosheets in vitro are almost undetectable because of their poor ***,the intracellular SHG signals from BP nanosheets could be measured by in vivo optical imaging due to the efficient enrichment of living HeLa ***,the SHG signal intensity from BP nanosheets increases with the prolonged incubation *** can be expected that the BP nanosheets could be a promising intracellular SHG nanoprobe employed for visually in vivo biomedical imaging in practical cancer photothermal therapy(PIT).

关键词： Second harmonic generation nanoprobe black phosphorus nanosheets in vivo im-aging HeLa cells visual monitoring