Article
Materials Science, Multidisciplinary
Yu E. Vysokikh, T. Mikhailova, S. Yu Krasnoborodko, A. S. Kolomiytsev, O. I. Ilin, A. N. Shaposhnikov, V. N. Berzhansky, M. F. Bulatov, D. Churikov, V. Shevyakov
Summary: The study discusses the importance of improving magnetic structure investigation with the lowest possible resolution for the study and practical implementation of fundamental magnetism. By using scanning near-field magneto-optical microscopy (SNMOM) and new technology based on focused ion beam (FIB) treatment to produce aperture cantilevers with carbon hollow pyramid tip (ACCT), it is shown that ACCT have better light transmission coefficients compared to commonly used aperture silicon cantilevers.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
James Callum Stewart, Ye Fan, John S. H. Danial, Alexander Goetz, Adarsh S. Prasad, Oliver J. Burton, Jack A. Alexander-Webber, Steven F. Lee, Sarah M. Skoff, Vitaliy Babenko, Stephan Hofmann
Summary: Researchers demonstrate three-dimensional emitter localization in hBN through monolayer engineering, achieving both vertical and lateral positioning while preserving the 2D nature of the material. By treating hBN MLs differently, emitter bleaching can be suppressed or activated, allowing for precise control of emission and enabling tailored approaches towards addressable emitter array designs.
Article
Physics, Applied
Yunkun Wu, Xiaojing Liu, Xiaozhuo Qi, Liu Lu, Guoping Guo, Guangcan Guo, Xifeng Ren
Summary: The study demonstrates a cavity-free, broadband method for modulating and collecting the fluorescence of a single-photon emitter using a fiber taper-silver nanowire plasmonic probe. The interaction between the plasmonic probe and the single colloidal quantum dot significantly reduces the lifetime of the quantum dot by an average factor of 3.38. The proposed near-field modulation method shows potential for manipulating the luminescence of systems based on single-photon emitters with higher efficiency compared to traditional methods.
APPLIED PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Hongqiang Ma, Wei Jiang, Jianquan Xu, Yang Liu
Summary: The study introduced an efficient approach called EVER for accurately recovering distorted fluorescent emitters from heterogeneous background, improving the fidelity of reconstructed super-resolution images. EVER does not require manual adjustment of parameters and has been implemented as an easy-to-use ImageJ plugin.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Bin Meng, Yong Xie, Le Chen, Haitao Wang, Ming Li, Zhuxin Dong
Summary: This paper presents a convenient technical scheme for enhancing the performance of atomic force microscopy (AFM) tips in tip-enhanced Raman spectroscopy (TERS) applications. The silver decoration on homemade tips is confined to the apex of commercial tips through an AFM-controlled electrochemical reaction. The efficiency of the metal coating is ensured by the reduction of Ag+ in a highly sealed environment. Key factors affecting the process include the use of silver nitrate solution, ambient relative humidity and temperature, electric potential bias, and tip-surface distance. The silver-coated tips are then tested for TERS measurement of carbon nanotubes (CNTs), resulting in simultaneous characterization of the CNTs' morphology and chemical properties. The Raman spectra show that our plasmonic tip exhibits a local field signal increase of approximately 30-fold, and the corresponding TERS image can resolve at the single-pixel level laterally.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Optics
Najmeh Abbasirad, Angela Barreda, Yi-Ju Chen, Jer-Shing Huang, Isabelle Staude, Frank Setzpfandt, Thomas Pertsch
Summary: The emission pattern of electromagnetic fields from the aperture tip of a scanning near-field optical microscope (SNOM) depends on the tip's geometry and coating. Previous studies mainly focused on the far-field measurements and theoretical models based on them. In this study, the authors used an automated dual-tip SNOM to systematically characterize the emission in the near-field. The results demonstrate the feasibility of this technique for measuring the emission from aperture tips in the near field, and the asymmetric SPP radiation patterns have potential applications in photonic integrated circuits or biological and chemical sensing.
PHOTONICS RESEARCH
(2022)
Article
Physics, Applied
Joshua L. Reynolds, Yonatan Israel, Adam J. Bowman, Brannon B. Klopfer, Mark A. Kasevich
Summary: In this study, photoemission from a Schottky emitter triggered by nanosecond laser pulses is demonstrated. By using photon energies optimally tuned to the emission potential barrier, pulses containing over 105 electrons with energy spreads below 1 eV are generated through a single-photon photoemission process. These results can have widespread implementation and are consistent with a theoretical model of laser-triggered electron emission and energetic broadening during propagation.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Angika Bulbul, Nathaniel Hai, Joseph Rosen
Summary: FINCH is a self-interference incoherent digital holography technique with higher lateral resolution than equivalent incoherent imaging systems but lower axial resolution. COACH is another incoherent holographic method with improved axial resolution but same lateral resolution as direct imaging. CAFIR, a variant of COACH, combines the improved lateral resolution of FINCH with the high axial resolution of direct imaging.
Article
Optics
Dominic P. Ditmyer, Noel Ibarra, Huizhong Xu
Summary: In this study, the coupling between a nanoscopic dielectric slot waveguide and a metallic-tip-enhanced dipole quantum emitter is investigated to achieve optimal emission and guiding of photons along a titanium dioxide photonic waveguide. Finite element calculations are used to analyze the mode properties and predict the efficiency of emission guidance. It is found that the effective quantum yield is dependent on various parameters and that a maximum quantum yield of over 30% can be achieved in each direction of the waveguide. By placing the dipole emitter near a silver nanotip, the overall emission rate can be increased and the emitter-waveguide coupling can be controlled in situ, leading to a 35-fold increase in the emission rate.
OPTICS COMMUNICATIONS
(2023)
Review
Optics
Chuankang Li, Vannhu Le, Xiaona Wang, Xiang Hao, Xu Liu, Cuifang Kuang
Summary: The emergence of optical super-resolution imaging has advanced biological research at the nanoscale level, overcoming the constraints of diffraction limit in conventional far-field optical imaging. Recent advancements in techniques have addressed the weaknesses of existing super-resolution modalities in biological applications, focusing on enhancing system resolution, background suppression, and reducing complexity. The modification of factors such as hardware, light path, fluorescent probe, and algorithm has led to the development of cost-effective and flexible imaging tools like the subtraction technique.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Xiaomin Zheng, Jie Zhou, Lei Wang, Meiting Wang, Wenshuai Wu, Jiajie Chen, Junle Qu, Bruce Zhi Gao, Yonghong Shao
Summary: Structured Illumination Microscopy (SIM) has shown remarkable progress in resolution, imaging depth, and technological advancements in recent years, making it a powerful tool in biomedical research. Its flexibility allows for effective combination with other methods, offering enhanced imaging capabilities.
Article
Optics
Byullee Park, Moongyu Han, Hongyoon Kim, Jinhee Yoo, Dong Kyo Oh, Seongwon Moon, Joongho Ahn, Hae Gyun Lim, Inki Kim, Hyung Ham Kim, Junsuk Rho, Chulhong Kim
Summary: This study demonstrates a proof-of-concept of super-resolution, near-field scanning photoacoustic microscopy using a lens-free, shear-force photoacoustic microscopy system with a tapered fiber. By attaching an uncoated tapered fiber to a quartz tuning fork and maintaining the near-field distance between the fiber and sample surface via a shear-force detection mechanism, targets are imaged with high lateral resolutions.
LASER & PHOTONICS REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
Zachary Hallenbeck, Esther A. Wertz
Summary: This work introduces a new technique that combines super-resolution microscopy with fluorescence lifetime imaging microscopy to study the enhancement of single-molecule decay rate by plasmonic nanoparticles. The technique provides high spatial resolution and temporal resolution, allowing for a better understanding of the mechanisms of plasmon-enhanced emission.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Rebecca Buechner, Thomas Weber, Lucca Kuhner, Stefan A. Maier, Andreas Tittl
Summary: This study demonstrates the ability to choose between weak and strong tip-antenna coupling regimes when using metallic tips in s-SNOM by carefully adjusting the illumination conditions and resonator orientation. It shows that highly scattering metallic tips can be used to map plasmonic modes with comparatively higher signal strengths. Additionally, the research reveals the collective effects of nanoantenna arrays and provides guidelines for optimized array designs for both near-field and far-field applications.
Article
Multidisciplinary Sciences
Donato Conteduca, Isabel Barth, Giampaolo Pitruzzello, Christopher P. Reardon, Emiliano R. Martins, Thomas F. Krauss
Summary: Dielectric metasurfaces have different Q-factor and light localisation requirements for sensing and imaging. Here, the authors present a dielectric metasurface, supporting two optical modes with sharp Fano resonances for high Q-factors and strong spatial confinement, allowing both sensing and imaging.
NATURE COMMUNICATIONS
(2021)
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)