Article
Chemistry, Multidisciplinary
Ben Yang, Gong Chen, Atif Ghafoor, Yu-Fan Zhang, Xian-Biao Zhang, Hang Li, Xiao-Ru Dong, Rui-Pu Wang, Yang Zhang, Yao Zhang, Zhen-Chao Dong
Summary: We investigated the chemical effects on Raman signals in surface enhanced Raman spectroscopy (SERS) through tip-enhanced Raman spectroscopy (TERS) of a single planar ZnPc molecule with controlled contact environments. TERS signals were enhanced when a tip-molecule point contact was made, due to the generation of a ground-state charge-transfer induced vertical Raman polarizability and the strong vertical plasmonic field in the nanocavity. However, TERS signals were quenched when ZnPc was chemisorbed flatly on substrates, attributed to the Raman polarizability screening effect induced by interfacial dynamic charge transfer.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Taehyun Kim, Jongsu Lee, Eui-Sang Yu, Seungha Lee, Hyeonbin Woo, Jeonghun Kwak, Seok Chung, Inhee Choi, Yong-Sang Ryu
Summary: This article introduces the structure and characteristics of the Fabry-Perot (FP) resonator, and demonstrates the tuning of surface-enhanced Raman scattering (SERS) enhancement factor (EF) using a metal-dielectric-metal structure. Computational and experimental analyses investigate the near-field EF of randomly dispersed gold nano-gaps and the far-field SERS EF modulation by varying the optical resonance of the FP etalon. The study highlights the importance of wavelength matching between FP resonance and excitation/scattering wavelengths in determining the magnitude of the SERS EF. Finally, a tunable SERS platform with a controlled dielectric cavity is proposed, and its dynamic SERS switching performance is validated through information encryption via liquid immersion.
Article
Chemistry, Multidisciplinary
Yang Luo, Alberto Martin-Jimenez, Rico Gutzler, Manish Garg, Klaus Kern
Summary: Tip-enhanced Raman spectroscopy (TERS) allows for the tracing of vibrational fingerprints of molecules and low-dimensional materials with subnanometer resolution. The localization of light in the plasmonic nanocavity of the STM enables high spatial resolution in STM-TERS. However, the temporal resolution is currently limited. In this study, stable TERS measurements were demonstrated from subphthalocyanine (SubPc) molecules excited by 500 fs long laser pulses in a low-temperature (LT) ultrahigh-vacuum (UHV) STM. The intensity of the TERS signal scales linearly with the increasing flux of the laser pulses and exponentially with the decreasing gap-size of the plasmonic nanocavity. Furthermore, the characteristic features of TERS excited with ultrashort pulses were compared with those excited with a continuous-wave (CW) laser.
Article
Chemistry, Physical
Shota Takahashi, Atsunori Sakurai, Tatsuto Mochizuki, Toshiki Sugimoto
Summary: In this study, we achieved significant enhancement of the nonlinear optical response in a tip-substrate plasmonic nanocavity. By focusing on the near-field second harmonics of a wavelength-tunable femtosecond laser, we demonstrated that the enhancement of nonlinear optical effects occurs over a broad wavelength range from visible to infrared. We also discovered that the sharpness of the tip apexes and the surface geometry of the tip shafts both affect the broadband nonlinear optical property.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Oscar J. Ballesteros-Llanos, Efrain Mejia-Beltran, Maribel Juarez-Hernandez
Summary: The performance of a Raman fiber laser was modified step-by-step, changing from a simple free-running distributed-feedback cavity to a ring configuration, adding a Fabry-Perot filter, and inserting a piece of Yb3+-doped fiber. Each modification resulted in changes to the emitted spectrum, increased efficiency, and improved power stability. The enhancements led to emission of a single-line with improved stability and decreased oscillating threshold. These modifications offer alternatives for achieving more stable, efficient, and pure emission in Raman fiber lasers.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Haojie Liu, Enbo Fan, Hexiang Xu, Yuhan Wu, Yang He, Jie Li, Jun Ma, Bai-Ou Guan
Summary: Researchers have demonstrated a photothermally generated microbubble sensor on a single-mode fiber tip that has a tunable frequency bandwidth for sensitive detection of acoustic waves. The microbubble forms a Fabry-Perot cavity at the fiber tip and detects the acoustic waves through interferometric readout of the bubble deformation.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yongzhang Chen, Yiwen Zheng, Dezhi Liang, Yufeng Zhang, Jiahao Guo, Siping Lian, Yongqin Yu, Chenlin Du, Shuangchen Ruan
Summary: This study investigates a novel and compact fiber-tip pressure sensor based on a Fabry-Perot interferometer (FPI). The sensor is fabricated by welding a hollow silica tube on a single mode fiber and coating it with a UV curable polymer film at the tip. The sensor demonstrates high sensitivity, fast response, excellent repeatability, and easy fabrication, making it suitable for high sensitivity pressure detection in a limited space.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Applied
Zhe Shen, Xuefei Zi, Mengyuan Du, Lin Zhang, Yaochun Shen, Maohai Hu
Summary: Numerical simulation of the local electric field enhancement in the virtual-real probe dimer structure revealed ultrahigh field enhancement and spatial resolution, making it promising for high-sensitivity detection and high-resolution imaging.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Elena Mavrona, Shima Rajabali, Felice Appugliese, Johan Andberger, Mattias Beck, Giacomo Scalari, Jerome Faist
Summary: A monolithic THz planar Fabry-Perot cavity with metallic mirrors featuring subwavelength apertures was reported. The cavity was successfully coupled to the cyclotron resonance of a high-mobility, two-dimensional electron gas. The first mode at around 300 GHz showed Q factors up to 89, cooperativity of 56.4, and a normalized coupling ratio of up to 17.5% in the first mode.
Article
Multidisciplinary Sciences
Ryo Kato, Toki Moriyama, Takayuki Umakoshi, Taka-aki Yano, Prabhat Verma
Summary: In this study, long-duration TERS imaging of a micrometer-sized WS2 sample was achieved in a reproducible manner, enabling the detection of nanoscale defects and rare optical signals in large area 2D materials.
Article
Chemistry, Physical
Chih-Feng Wang, Patrick Z. El-Khoury
Summary: The study reveals that nonlinear optical processes can be enhanced at plasmonic tip-sample nanojunctions, allowing for high-spatial-resolution chemical analysis through enhanced spectroscopies.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Gary Sean Cooney, David Talaga, Vicky Ury-Thiery, Yann Fichou, Yuhan Huang, Sophie Lecomte, Sebastien Bonhommeau
Summary: In this study, TERS was used to visualize the spatial distribution of adenine, protein secondary structure, and amino acids in single polyadenosine-induced tau fibrils. The findings provide insights into the incorporation of the polyadenosine cofactor in the fibril structure and its interaction with amino acids. TERS proves to be a powerful technique for studying cofactors in individual tau fibrils and their mode of interaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Analytical
Pengfei Zhang, Chao Wang, Liuwei Wan, Qianqian Zhang, Zidan Gong, Zixiong Qin, Chi Chiu Chan
Summary: This paper proposes an opto-microfluidic static pressure sensor based on a fiber Fabry-Perot Interferometer (FPI) with extended air cavity to enhance the measuring sensitivity. The sensor structure is constructed in a microfluidic channel and combines fixed fiber-end reflection with floating liquid surface reflection. The pressure can be measured by detecting the shift of the FPI spectrum caused by the drift of the liquid surface due to changes in aquatic pressure. The sensitivity of the sensor structure can be significantly improved by extending the air region of the FPI.
Article
Engineering, Electrical & Electronic
Yeong-Geun Jeon, Gwang-Ro Yun, Jongyeong Kim, Dongho Kim
Summary: In this paper, we propose an innovative polarization reconfigurable high-gain Fabry-Perot cavity (FPC) antenna. By using a novel polarization conversion partially reflective surface (PCPRS) as a superstrate, the antenna can electrically select its polarization among three linear polarization (LP) modes and maintain stable high gain.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
Guoqiang Li, Xia Cen, Juan Su, Chi Wu
Summary: A new instrument for measuring the temperature of distilled water is proposed and demonstrated to have a high detection limit. The instrument outperforms existing technology in terms of performance, while maintaining a small size.
Article
Chemistry, Physical
Xu Chen, Guillaume Goubert, Song Jiang, Richard P. Van Duyne
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Chemistry, Physical
Guillaume Goubert, Xu Chen, Song Jiang, Richard P. Van Duyne
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2018)
Article
Chemistry, Multidisciplinary
Duc Nguyen, Gyeongwon Kang, Naihao Chiang, Xu Chen, Tamar Seideman, Mark C. Hersam, George C. Schatz, Richard P. Van Duyne
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2018)
Article
Chemistry, Physical
Xu Chen, Vitor Brasiliense, Richard P. Van Duyne
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Chemistry, Physical
Yao Zhang, Rui Zhang, Song Jiang, Yang Zhang, Zhen-Chao Dong
Article
Chemistry, Physical
Song Jiang, Zhu Chen, Xu Chen, Duc Nguyen, Michael Mattei, Guillaume Goubert, Richard P. Van Duyne
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Chemistry, Multidisciplinary
Zhu Chen, Song Jiang, Gyeongwon Kang, Duc Nguyen, George C. Schatz, Richard P. Van Duyne
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Multidisciplinary
Muwen Yang, Michael S. Mattei, Charles R. Cherqui, Xu Chen, Richard P. Van Duyne, George C. Schatz
Article
Multidisciplinary Sciences
Jonathan T. Reeder, Yeguang Xue, Daniel Franklin, Yujun Deng, Jungil Choi, Olivia Prado, Robin Kim, Claire Liu, Justin Hanson, John Ciraldo, Amay J. Bandodkar, Siddharth Krishnan, Alexandra Johnson, Emily Patnaude, Raudel Avila, Yonggang Huang, John A. Rogers
NATURE COMMUNICATIONS
(2019)
Review
Physics, Condensed Matter
Jeremy F. Schultz, Shaowei Li, Song Jiang, Nan Jiang
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Spectroscopy
Song Jiang, Rui Zhang, Xian-Biao Zhang, Yang Zhang, Yao Zhang, Zhen-Chao Dong
Summary: The study investigates the well-ordered supramolecular self-assembly based on cytosine and 4,4 '-bipyridine on Ag(111) surface using TERS and STM, revealing the sensitivity of TERS to local molecular interactions and potential for monitoring the functionality of molecular architectures.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Cell Biology
Tyler R. Ray, Maja Ivanovic, Paul M. Curtis, Daniel Franklin, Kerem Guventurk, William J. Jeang, Joseph Chafetz, Hannah Gaertner, Grace Young, Steve Rebollo, Jeffrey B. Model, Stephen P. Lee, John Ciraldo, Jonathan T. Reeder, Aurelie Hourlier-Fargette, Amay J. Bandodkar, Jungil Choi, Alexander J. Aranyosi, Roozbeh Ghaffari, Susanna A. McColley, Shannon Haymond, John A. Rogers
Summary: Quantitative assessment of chloride concentrations in sweat is crucial for early diagnosis of cystic fibrosis. A new soft, epidermal microfluidic device allows for efficient sweat collection and analysis, with real-time image analysis for quantification using a smartphone camera. This technology has shown clinical equivalence to existing devices and can potentially improve diagnostic capabilities outside clinical settings.
SCIENCE TRANSLATIONAL MEDICINE
(2021)
