Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 24
·12845-12851
·
IF 7.443
Ling Lin,Gui-Qi Gao,Qing Zhu,An-Wu Xu
Plasmon hot electron injection enhanced photocurrent has potential applications in light harvesting in photovoltaic devices. We demonstrate a cathodic photocurrent enhancement system utilizing strongly coupled Ag@perylene (Ag@Pe) core–shell nanowires, and the perylene shell thickness can be readily controlled. The strong coupling between the plasmonic resonance and molecular exciton resonance is evidenced by the substantial plasmon damping of Ag NWs and the enhancement of fluorescence of perylene with a red shift in Ag@Pe samples. The photocurrent of the Ag@Pe sample with a shell thickness of 5.8 nm (Ag@Pe-5.8 nm) shows a 16-fold enhancement compared to that of perylene. While, a simply mixed Ag–perylene sample displays only a 6-fold enhancement in photocurrent, indicating that the strong coupling in the Ag@Pe system plays a major role in the enhancement of photocurrent through hot electron transfer from the silver nanowires to perylene molecules. This strongly coupled Ag@Pe hetero-nanostructure could find potential applications in surface plasmon-driven, hot-electron solar cells and surface catalytic reactions.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 12
·期 5
·3112-3120
·
IF 6.97
Li Li,Lei Wang,Chenglin Du,Zhongyuan Guan,Yinxiao Xiang,Wei Wu,Mengxin Ren,Xinzheng Zhang,Aiwei Tang,Wei Cai,Jingjun Xu
Strong coupling originating from excitons of quantum dots and plasmons in nanocavities can be realized at room temperature due to the large electromagnetic field enhancement of plasmons, offering building blocks for quantum information systems, ultralow-power switches and lasers. However, most of the current strong coupling effects were realized by the interaction between excitons and far-field light excited bright plasmon modes in the visible range. Beyond that, there is still a lack of direct imaging of polariton modes at the nanoscale. In this work, by using cathodoluminescence, ultrastrong coupling with Rabi splitting exceeding 1 eV between bonding breathing plasmons of aluminum (Al) metal–insulator–metal (MIM) cavities and excited states of CdZnS/ZnS quantum dots was observed in the near-ultraviolet (UV) spectrum. Further, the hybridization of the QDs excitons and bonding breathing plasmonic modes is verified by deep-subwavelength images of polaritonic modes in real-space. Analytic analysis based on the coupled oscillator model and full-wave electromagnetic simulations is consistent with our experimental results. Our work not only indicates the great potential of electron excited plasmon modes for strong coupling applications, but also extends the polaritonic frequency to the UV range with Al nanocavities.
研究领域:
光学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Photonics Research
·
2023
·Vol. 11
·期 10
·1791-1801
·
IF 7.6
Tianyu Liu,Peng Ran,Yirong Su,Zeng Chen,Renchen Lai,Weidong Shen,Yaoguang Ma,Haiming Zhu,Yang (Michael) Yang
Exciton-polaritons offer the potential to achieve electrically pumped perovskite polariton lasers with much lower current thresholds than conventional photonic lasers. While optically pumped exciton-polaritons have been widely studied in halide perovskites, electrically-pumped polaritons remain limited. In this study, we demonstrate the use of a solution-processing strategy to develop halide perovskite polariton light-emitting diodes (LEDs) that operate at room temperature. The strong coupling of excitons and cavity photons is confirmed through the dispersion relation from angle-resolved reflectivity, with a Rabi splitting energy of 64 meV. Our devices exhibit angle-resolved electroluminescence following the low polariton branch and achieve external quantum efficiencies of 1.7%, 3.85%, and 3.7% for detunings of 1.1, −77, and −128 meV, respectively. We also explore devices with higher efficiency of 5.37% and a narrower spectral bandwidth of 6.5 nm through the optimization of a top emitting electrode. Our work demonstrates, to our knowledge, the first room-temperature perovskite polariton LED with a typical vertical geometry and represents a significant step towards realizing electrically pumped perovskite polariton lasers.
研究领域:
材料科学
·
光学工程
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2016
·Vol. 7
·期 1
·1-8
·
IF 11.329
Du Zengyi,Yang Xiong,Lin Hai,Fang Delong,Du Guan,Xing Jie,Yang Huan,Zhu Xiyu,Wen Hai-Hu
In the field of iron-based superconductors, one of the frontier studies is about the pairing mechanism. The recently discovered (Li 1− x Fe x )OHFeSe superconductor with the transition temperature of about 40 K provides a good platform to check the origin of double superconducting gaps and high transition temperature in the monolayer FeSe thin film. Here we report a scanning tunnelling spectroscopy study on the (Li 1− x Fe x )OHFeSe single crystals. The tunnelling spectrum mimics that of the monolayer FeSe thin film and shows double gaps at about 14.3 and 8.6 meV. Further analysis based on the quasiparticle interference allows us to rule out the d -wave gap, and for the first time assign the larger (smaller) gap to the outer (inner) Fermi pockets (after folding) associating with the d xy ( d xz /d yz ) orbitals, respectively. The gap ratio amounts to 8.7, which demonstrates the strong coupling mechanism in the present superconducting system.
研究领域:
凝聚态物理
·
超导研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 34
·期 8
·2109088
·
IF 30.849
Kaizhen Liu,Guangyan Huang,Xiang Li,Guangpeng Zhu,Wei Du,Tao Wang
Vibrational strong coupling (VSC), the strong coupling between optical resonances and the dipolar absorption of molecular vibrations at mid-infrared frequencies, holds the great potential for the development of ultrasensitive infrared spectroscopy, the modification of chemical properties of molecules, and the control of chemical reactions. In the realm of ultracompact VSC, there is a need to scale down the size of mid-infrared optical resonators and to elevate their optical field strength. Herein, by using single quartz micropillars as mid-infrared optical resonators, the strong coupling is demonstrated between surface phonon polariton (SPhP) resonances and molecular vibrations from far-field observation. The single quartz micropillars support sharp SPhP resonances with an ultrasmall mode volume, which strongly couples with the molecular vibrations of 4-nitrobenzyl alcohol (C 7 H 7 NO 3 ) molecules featuring pronounced mode splitting and anticrossing dispersion. The coupling strength depends on the molecular concentration and reaches the strong coupling regime with only 7300 molecules. The findings pave the way for promoting the VSC sensitivity, miniaturing the VSC devices, and will boost the development of ultracompact mid-infrared spectroscopy and chemical reaction control devices.
研究领域:
物理化学
·
光学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Light-Science & Applications
·
2025
·Vol. 14
·期 1
·1-9
·
IF 23.4
Yang Jiaxing,Zhang Liyu,Wang Kai,Zhang Chen,Fan Aoyu,He Zijian,Li Zhidi,Han Xiaobo,Ling Furi,Lu Peixiang
The strong coupling between photons and phonons in polar materials gives rise to phonon-polaritons that encapsulate a wealth of physical information, offering crucial tools for the ultrafast terahertz sources and the topological engineering of terahertz light. However, it is still quite challenging to form and manipulate the terahertz phonon-polaritons under the ultrastrong coupling regime till now. In this work, we demonstrate the ultrastrong coupling between the phonon (at 0.95 THz) in a MAPbI 3 film and the metallic bound states in the continuum (BICs) in Au metasurfaces. The Rabi splitting can be continuously tuned from 28% to 48.4% of the phonon frequency by adjusting the parameters (size, shape and period) of Au metasurfaces, reaching the ultrastrong coupling regime. By introducing wavelet transform, the mode evolution information of the terahertz phonon-polariton is successfully extracted. It indicates that the phonon radiation intensity of the MAPbI 3 film is enhanced as the coupling strength is increased. This work not only establishes a new platform for terahertz devices but also opens new avenues for exploring the intricate dynamics of terahertz phonon-polaritons.
研究领域:
光学工程
·
凝聚态物理
·
太赫兹科学与技术
·
纳米光子学
·
材料物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Yuchi Zhang,Hanzhi Yao,Yan Xu,Zhiguo Xia
Engineering novel ratiometric temperature sensors with high temperature sensitivity is still of a great challenge in versatile temperature measurement fields. Herein, a self-calibrated optical luminescent thermometer based on Eu 3+ /Mn 2+ dual-activator was fabricated in the same nanocomposite system, which integrated the photoluminescence originated from the temperature-insensitive Eu-metal organic framework with weak coupling effect and the temperature-sensitive Zn 2 GeO 4 :Mn 2+ with strong coupling effect. Specifically, the as-prepared nanocomposites composed of lanthanide MOF Eu-BTC (BTC = 1,3,5-benzenetricarboxylic acid) and Zn 2 GeO 4 :Mn 2+ nanorods possessed Eu 3+ /Mn 2+ dual red/green emission, which displays excellent ratiometric temperature-sensing functions and also has high relative sensitivity ( S r ) of 4.1% ºC −1 when they are used as ratiometric luminescent thermometer in the physiological temperatures (25–45 °C). These results demonstrate that such a design strategy with synergistic weak/strong coupling luminescence is useful and the as-obtained Eu-MOF/Zn 2 GeO 4 :Mn 2+ nanocomposites can be potential for temperature sensor applications.
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Yanlin Mi,Zhiyang Xu,Chen Zhao,Tianrui Zhai,Yan Zhao,Yijian Jiang,Yinzhou Yan
Surface-enhanced Raman spectroscopy (SERS) is a powerful optical technique with high sensitivity to identify analytes down to a single molecule by fingerprinting vibrational information. The strong coupling in microcavities for supermodes with promoted quality factors demonstrates the capability to boost the interaction between photons and molecules for nonlinear effects. Here a strong-coupling cascade microsphere-cavity (MC) achieving spontaneous Raman enhancement is reported, for the first time. The cascade MC is composed of two size-mismatched microspheres, both of which support optical whispering-gallery modes (WGMs) with significantly different free-space ranges. The strong coupling between the supported WGMs in the microspheres can be achieved when the quasi-vernier effect of resonant modes occurs, by which the energy splitting is up to 4 meV. The fast energy transfer between the size-mismatched MCs therefore increases the quality factor up to 2.1 × 10 3 for the upper supermode branch. The strong-coupling cascade MC structure provides an extra enhancement channel for the Au-based SERS substrate, demonstrating an enhancement factor of Raman intensity ( EFRI ) up to 2.6 × 10 10 for the limit of detection ( LoD ) down to 10 −12 M of 4-aminothiophenol (4-ATP). The strong-coupling cascade MC substrates also exhibit the versatility for identification of multiple analytes for high-performance Raman trace-detection applications.
研究领域:
光学
·
分析化学
·
光子学
·
纳米技术
✓ 已验证
DOI
高影响因子
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