Article
Chemistry, Analytical
Tao Xie, Pan Li, Jiazheng Wang, Ronglu Dong, Liangbao Yang
Summary: The catassembly method allows for the rapid and simple self-assembly of highly repeatable large-scale multilayers with small nanoparticles. The plasmonic multilayers formed using this method demonstrate high sensitivity and stability for SERS sensing applications.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Chih-Feng Wang, Mikhail Zamkov, Patrick Z. El-Khoury
Summary: This study achieves record spatial resolution in ambient tip-enhanced photoluminescence (TEPL) from CdSe/ZnS semiconductor quantum dots by taking advantage of surface roughness at the apex of a sputtered plasmonic gold probe. The reproducibility of observations is demonstrated using different plasmonic probes and samples. The high spatial resolution in TEPL is attributed to field enhancement at the metal tip-fluorophore interface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Duo Jin, Zhenxu Bai, Zhiwei Lu, Rong Fan, ZhongAn Zhao, Xuezong Yang, Yulei Wang, Richard P. Mildren
Summary: This study reports a diamond Brillouin laser employing doubly resonant technology, achieving high Brillouin output power and narrow linewidth. By suppressing amplified spontaneous emission noise, this technology has the potential for realizing Brillouin oscillators with high power and kHz linewidths.
Article
Nanoscience & Nanotechnology
Yanxing Wang, Wenjing Li, Yaqun Ma, Bo Hu, Xueli Chen, Ruichan Lv
Summary: In this research, a thermally activated upconversion luminescence (UCL) probe with ratiometric temperature sensing was designed using Nd3+, Tm3+, and Ce3+-doped rare earth nanoparticles (RENPs). By optimizing the elements and ratios, the excitation wavelength was successfully modulated to 1064 nm and enhanced UCL intensity. The prepared RENPs exhibited a significant temperature response at 1064 nm excitation, making them suitable for thermochromic coatings. The intensity ratio of three-photon UCL (1064 nm excitation) to two-photon UCL (808 nm excitation) as a function of temperature can be utilized as a ratiometric temperature detector. Therefore, this designed thermochromic coating holds great potential for applications in optoelectronic devices and industrial sensors.
Article
Optics
Yulong Cui, Xin Tian, Binyu Rao, Hao Li, Wei Huang, Wenxi Pei, Meng Wang, Zilun Chen, Zefeng Wang
Summary: We present the first hundred-watt continuous wave fiber gas laser using H-2-filled hollow-core photonic crystal fiber (PCF) through stimulated Raman scattering. A homemade narrow-linewidth fiber oscillator with a 3 dB linewidth of 0.15 nm at 380 W output power serves as the pump source. Through the fabrication and use of a hollow-core fiber end-cap, several-hundred-watt pump power is efficiently and stably coupled into the hollow core and the gas is sealed. A maximum power of 110 W at 1153 nm is achieved in a 5 m long hollow-core PCF filled with 36 bar H-2, with a conversion efficiency of approximately 48.9% for the first Stokes power. This work paves the way for high-power fiber gas Raman lasers.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
Article
Spectroscopy
Zsuzsanna Heiner, Fani Madzharova, Vesna Zivanovic, Janina Kneipp
Summary: The study demonstrates that the two-photon excited process of surface-enhanced hyper-Raman scattering with short-wave infrared excitation using gold nanostructures allows for observations of molecules in cellular environments. This has important implications for the utilization of SEHRS in bio-probing.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Optics
Yuxi Jia, Chencheng Shen, Xianglong Cai, Jinbo Liu, Tiancheng Zheng, Ming Xu, Dong Liu, Jingwei Guo
Summary: Nitrogen was used as an active gas to generate laser beams at 1415 nm and 2110 nm through Raman scattering. By optimizing parameters, the pulse energy and peak power of the lasers were successfully increased.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Jingbin Li, Junfang Li, Wencai Yi, Meng Yin, Yanling Fu, Guangcheng Xi
Summary: This paper reports the surface-enhanced Raman spectroscopy performance of metallic niobium nitride three-dimensional hierarchical network structures. The unique nanocavity structure promotes the entry of molecules and takes advantage of electromagnetic hot spots, and the substrate exhibits outstanding environmental durability, high signal reproducibility, and detection universality.
ANALYTICAL CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Miao Yu, Qihang Tian, Guangyuan He, Kaimin Cui, Jihong Zhang
Summary: Surface-enhanced Raman scattering (SERS) is a novel method for low concentration molecular detection, and tapered fiber SERS probes based on silver nanocubes exhibit high sensitivity. These probes can be used for both qualitative and quantitative analysis, with an optimal cone angle of 8.3 degrees.
ADVANCED FIBER MATERIALS
(2021)
Article
Chemistry, Physical
Siyu Wang, Ruhao Pan, Wanying He, Lianfu Li, Yang Yang, Zengfeng Du, Zhendong Luan, Xin Zhang
Summary: In this study, a new type of surface-enhanced Raman scattering insertion probe (RiP-SERS) was developed for deep-sea applications using a Coccinella septempunctata-shaped SERS substrate. The Raman spectrum of biomolecules in deep-sea cold seep vents was successfully obtained. The SERS substrate showed excellent pressure resistance and successfully collected Raman peaks of various biomolecules. This successful application of SERS technology provides a new method for deep-sea biomolecule detection and has potential applications in detecting macromolecules in complex industrial systems.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Analytical
Li Guo, Jing Huang, Yaxin Chen, Bohan Zhang, Minbiao Ji
Summary: In this study, metal-lined hollow-core fiber (MLHCF) was used to improve the sensitivity of stimulated Raman scattering (SRS) in sensing dilute solutions. By extending the light-matter interaction volume, MLHCF showed significant enhancement and suppressed cross-phase modulation (XPM) background at a certain fiber length. The fiber-enhanced SRS (FE-SRS) method has potential in sensitive detection of molecules in solution and gas phases.
Article
Optics
Philipp Lamminger, Hubertus Hakert, Simon Lotz, Jan Philip Kolb, Tonio Kutscher, Sebastian Karpf, Robert Huber
Summary: This article introduces a new setup of four-wave mixing (FWM) which can shift the power from 1064 nm to 1300 nm region, achieving peak power of 2.5 kW. The setup generates pulses in the 900 nm region with a wavelength sweep range of 54 nm. By adjusting the source frequency, it enables applications such as time-encoded stimulated Raman scattering microscopy and spectro-temporal laser imaging.
Article
Optics
Djamila Bouaziz, Stephane Perrin, Tony Hajj, Gregoire Chabrol, Assia Guessoum, Nacer-Eddine Demagh, Sylvain Lecler
Summary: This study presents the first direct measurement of the three-dimensional distribution of photonic jets generated by shaped-tip multimode optical fibers, comparing the results to numerical simulations. Observing the power distribution of the non-fundamental mode around the photonic jets provides a better understanding of laser etching techniques using multimode optical fibers.
Article
Multidisciplinary Sciences
Yun A. Hong, Ji Won Ha
Summary: This study investigated the refractive index sensitivities of single hollow gold nanospheres (HAuNS) and single solid gold nanospheres (AuNS) in different media. The HAuNS with thin Au shell and inner cavity showed improved refractive index sensitivity compared to the AuNS. Furthermore, the HAuNS exhibited better refractive index sensitivity at the homogeneous LSPR scattering inflection points (IFs).
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Zhinan Yu, Zhengkun Wang, Jie Zhang
Summary: The study discussed the Raman enhancement mechanism of optical fibers decorated with silver nanoparticles as SERS substrates, focusing on the LSPR of AgNPs and cavity enhancement of a silver capillary. Optimal parameters for coating AgNPs and the formation mechanism based on temperature and velocity field distributions were explored. Experimental results demonstrated a detection limit down to 10(-11) mol/L, with a total enhancement factor of approximately 10(9) and an additional cavity-coupled enhancement effect.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Xinrui Lei, Luping Du, Xiaocong Yuan, Qiwen Zhan
Summary: Photonic skyrmions and merons are topological quasiparticles with nontrivial electromagnetic textures, which have great potential in manipulating light-matter interactions and deep-subwavelength imaging. In this study, the topological stability of photonic spin meron lattices is demonstrated by inducing a perturbation to break the C4 symmetry, revealing the metastability of photonic meron. The spin topology is verified through the interference of plasmonic vortices with a broken rotational symmetry, providing new insights into optical topological quasiparticles.
Article
Optics
Junna Yao, Xinhua Jiang, Jialang Zhang, Anting Wang, Qiwen Zhan
Summary: The high-order Poincare sphere introduces a mapping for representing vector beams with homogeneous ellipticity by a specific point on its surface. This study proposes a quantitative detection method for high-order Poincare sphere beams by introducing nonuniform polarization bases in the high-order Stokes parameters. The overall polarization detection is achieved by separating and measuring the intensity of different nonuniform polarization bases using an S-plate. The polarization evolution of the high-order Poincare sphere beams is demonstrated using the S-plate. These results provide new insights into the generation, evolution, and detection of arbitrary beams on the high-order Poincare sphere.
Article
Engineering, Electrical & Electronic
Haifeng Hu, Zhuo Chen, Qian Cao, Qiwen Zhan
Summary: In this article, a wavelength-tunable and OAM-switchable ultrafast fiber laser is demonstrated, which can emit vortex beam outputs with a topological charge of l = +1 or l = -1 and the center wavelength can be continuously tuned. The obtained output pulse has a high pulse energy and a compressed pulse duration. This laser can emit OAM-switchable output with a shorter pulse duration and a broad wavelength tuning range, providing potential for more sophisticated and customizable laser outputs by adding polarization control elements.
IEEE PHOTONICS JOURNAL
(2023)
Article
Optics
Jian Chen, Siyu Kuai, Guoliang Chen, Lihua Yu, Qiwen Zhan
Summary: This study numerically analyzes the tightly focusing characteristics of higher-order spatiotemporal optical vortices (STOVs) and presents a method to dynamically modulate their transverse orbital angular momentum. The simulation results show that when the waist radius of the incident wave packet is larger than 40% of the pupil radius of the focusing lens, the higher-order STOVs split into two first-order vortices. The spacing of the split vortices can be tailored by adjusting the waist radius of the incident wave packet. The presented method provides a flexible way to engineer spatiotemporal vortices in tightly focused wave packets.
Article
Physics, Applied
Junna Yao, Xiahua Jiang, Xiangle Li, Jialang Zhang, Qiwen Zhan, Anting Wang
Summary: We demonstrate a cascaded mode converter composed of q-plates and half waveplates for generating high-order Poincare sphere (HOPS) beams of different orders. The converter enables reliable and switchable generation of multiple HOPS beams with exponential growth in the available number of orders. The local polarization state and order of the HOPS beams can be used as two degrees of freedom to encode 2 bits of information. This method opens up possibilities for generating multiple and ultrahigh order Poincare sphere beams, with potential applications in communication systems.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
H. H. Fan, Y. P. Tai, H. H. Li, X. Z. Li, Q. W. Zhan
Summary: Structured light is a useful tool for particle manipulation, but creating the required structured light for arbitrary shapes is challenging. We propose a scheme that modifies the epicycle model in astrophysics to customize structured light freely and precisely. This method provides a simple and intuitive toolkit for designing structured light for complex tasks.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Wei Qiu, Leiming Zhou, Yuchen Wang, Xiaoyun Jiang, Chan Huang, Lin Zhou, Qiwen Zhan, Jigang Hu
Summary: This study investigates the strong longitudinal coupling of three topological photonic states (TPSs) in a one-dimensional topological photonic crystal heterostructure embedded with a graphene monolayer in the visible frequencies. The results show that these three TPSs can strongly interact with each other in the longitudinal direction, leading to a large Rabi splitting in spectral response. The study demonstrates the potential for developing practical topological photonic devices for on-chip optical applications.
Article
Optics
Wu Fei, Xiaoyun Jiang, Liangkun Dai, Wei Qiu, Yuwei Fang, Dongmei Li, Jigang Hu, Qiwen Zhan
Summary: We propose a metasurface composed of symmetry-broken dielectric tetramer arrays, which can generate polarization-selective dual-band toroidal dipole resonances (TDR) with ultra-narrow linewidth in the near-infrared region. By breaking the C4v symmetry of the tetramer arrays, two narrow-band TDRs with a linewidth of about 1.5 nm are created. The nature of TDRs is confirmed by multipolar decomposition of scattering power and electromagnetic field distribution calculations. The structure offers polarization-tunable dual toroidal dipole resonances with ultra-narrow bandwidth, which may find potential applications in optical switching, storage, polarization detection, and light emitting devices.
Article
Optics
Jie Cheng, Chenhao Wan, Qiwen Zhan
Summary: High-resolution sorting of light's orbital angular momentum (OAM) is achieved using custom-designed diffractive optical elements and the generalized spiral transformation. The experimental performance is approximately twice as good as previously reported, making these optical elements valuable for OAM-based optical communication and easily applicable to other fields that employ conformal mapping.
Article
Optics
Yunqing Jiang, Hongqing LI, Xiaoqiang Zhang, Fan Zhang, Yong Xu, Yongguang Xiao, Fengguang Liu, Anting Wang, Qiwen Zhan, Weisheng Zhao
Summary: The Tamm plasmon coupling (TPC) between spin THz thin films and photonic crystal structures is achieved, resulting in enhanced THz radiation. Simulation results show that the absorptance of spin THz thin films with TPC can be increased from 36.8% to 94.3%. Experimental results demonstrate a 264% enhancement in THz radiation. This approach offers possibilities for ultrafast THz optospintronics and other similar devices.
PHOTONICS RESEARCH
(2023)
Article
Optics
Dong Yang, Haifeng Hu, Han Gao, Jian Chen, Qiwen Zhan
Summary: Tightly focused vector fields generated through high-numerical-aperture objectives are crucial in nano-optics research. The Mie scattering nanointerferometry technique accurately reconstructs these fields. This study theoretically proves that by collecting transmitted light with two orthogonal polarization states simultaneously, more information of the scattering field can be acquired when nanoparticles are used to scan the fields, making measurements more efficient.
Article
Physics, Applied
Junan Zhu, Hao Zhang, Zhiquan Hu, Xingyuan Lu, Qiwen Zhan, Yangjian Cai, Chengliang Zhao
Summary: In this study, we propose an experimental scheme that uses deep neural networks to recognize the topological charge of partially coherent vortex beams propagating through the turbulent atmosphere and encountering unknown obstacles. The deep neural network accurately recognizes the topological charges for low-coherence vortex beams using only half of the available dataset, and surpasses the accuracy of high-coherence vortex beams when considering the turbulent atmosphere and obstacles.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Ni Zhang, Xinrui Lei, Jiachen Liu, Qiwen Zhan
Summary: This research proposes a continuous manipulation method for the topology of graphene plasmon skyrmions, which can be achieved by adjusting the electrotunable properties of graphene. The transformation of skyrmion number from 1 to 0.5 is evident, demonstrating the direct manipulation of graphene plasmon skyrmions. This work suggests a feasible way to flexibly control the topology of an optical skyrmionic field, which can be used for novel integrated photonic devices in the future.
Article
Nanoscience & Nanotechnology
Xingyuan Lu, Zhuoyi Wang, Chengliang Zhao, Qiwen Zhan, Yangjian Cai
Summary: This study proposes a general incoherent modal decomposition method for partially coherent light fields and demonstrates its feasibility through experimentation. The method can be used to reconstruct average intensity, cross-spectral density, and orthogonal decomposition properties of partially coherent light fields, revealing the invariance of light fields and retrieving embedded information after propagation through complex media. Examples of Gaussian-shell-model beam and partially coherent Gaussian array are used to demonstrate the reconstruction and even prediction of second-order statistics. This method is expected to pave the way for applications of partially coherent light in optical imaging, optical encryption, and antiturbulence optical communication.
Article
Nanoscience & Nanotechnology
Liuhao Zhu, Xiaohe Zhang, Guanghao Rui, Jun He, Bing Gu, Qiwen Zhan
Summary: This study presents a novel optical skipping rope technology that transfers transverse orbital angular momentum to trapped particles, enabling their rotation and specific orbital motion parallel to the optical axis. This innovative technology significantly increases the manipulation freedom of optical tweezers, holding great significance for optical manipulation, micromechanics, and celestial orbit mimicry applications.
