- 标题
- 摘要
- 关键词
- 实验方案
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Specialty probes give super-res imaging that special blink
摘要： Fluorescent probes light the way to cellular detail, but light can also get in the way. Because of the diffraction limit, structures closer to one another than 200 nanometers (nm) or so cannot be discerned. Unless you use probes with super-resolution imaging. These techniques, such as reversible saturable optical linear fluorescence transitions (RESOLFT) or photoactivated localization microscopy (PALM)/stochastic optical reconstruction microscopy (STORM), use specialty probes, dyes and fluorescent proteins (FPs) that can switch from dark to light and from one color to another. 'We need the labels in combination with the microscope to overcome the diffraction barrier,' says Stefan Jakobs, who develops probes at University Medical Center G?ttingen and the Max Planck Institute for Biophysical Chemistry. In structured illumination microscopy (SIM), labs routinely achieve 100-nm resolution, he says. Scientists using stimulated emission depletion microscopy (STED), RESOLFT, PALM or STORM reach beyond 50-nm resolution. In principle, he says, the methods are diffraction unlimited.
关键词： STORM,STED,RESOLFT,super-resolution imaging,SIM,fluorescent probes,diffraction limit,PALM
更新于2025-09-23 15:21:21
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Effect of Surface Plasmon Resonance on the Anomalous Result of Young’s Double-Slit Experiment with a Metal Screen
摘要： An abnormal result of Young’s classic experiment with two slits in a metal screen is discussed, in which the appearance of a light spot behind a screen located centrally between the images of the slits is unusual. It is shown that the anomaly is caused by plasmon resonance in the metal–dielectric structure. The intensity of the diffraction pattern is calculated. Under resonance conditions, it overcomes the diffraction limit.
关键词： Young’s double-slit experiment,metal screen,diffraction limit,plasmon resonance
更新于2025-09-23 15:21:01
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[IEEE 2019 Days on Diffraction (DD) - St. Petersburg, Russia (2019.6.3-2019.6.7)] 2019 Days on Diffraction (DD) - Normal mode coupling in a waveguide with a range-dependent sound speed profile in the bottom
摘要： In this paper, a novel graphene-based multiple-input multiple-output (MIMO) concept is proposed for high-rate nanoscale wireless communications between transceivers, which are nano/micrometers apart from each other. In particular, the proposed MIMO architecture considers exploiting a deep-subwavelength propagation channel made of graphene. This allows us to increase the number of transmitted symbol streams, while using a deep-subwavelength arrangement of individual plasmonic nanotransmit/receive elements in which the spacing between the transmitters and/or the receivers is tens of times smaller than the wavelength. This exclusive benefit is achieved with the aid of the phenomenon of graphene plasmons, where graphene offers the extremely confined and low-loss plasmon propagation. Hence, the proposed graphene-based MIMO system is capable of combating the fundamental limitations imposed on the classic MIMO configuration. We also present a novel graphene-specific channel adaptation technique, where the chemical potential of the graphene channel is varied to improve the power of the received signals.
关键词： MIMO,surface plasmon polariton,nanoscale communication,chemical potential,graphene,Correlation,diffraction limit,deep subwavelength
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) - Seoul, Korea (South) (2019.1.27-2019.1.31)] 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) - Diversified and Precise Plasmonic Color Tuning by Three-Dimensional Air-Gap Nanocavities
摘要： We report a new arrayed three-dimensional (3D) air-gap nanocavities with multiple tunable geometrical parameters. Light is tightly confined into the nanocavities and strong surface-plasmon coupling is introduced, realizing narrow band resonance. Vivid plasmonic colors are generated, and can be tuned by multiple geometrical parameters of the 3D nanocavities, including shapes, separations, and heights. What’s more, the surface-plasmon coupling resonance has different dependence on different variable geometrical parameters. So, multi-dimensional color tuning with different spectral sensitivities is realized by proper and precise structural design, leading to both broad gamut and sophisticated plasmonic color printing at the optical diffraction limit.
关键词： plasmonic color tuning,surface-plasmon coupling,color printing,optical diffraction limit,3D air-gap nanocavities
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Thin Disk Laser Operating in Fundamental Mode up to a Power of 4kW
摘要： Fundamental mode lasers at high power are desirable to accommodate many industrial and scientific applications especially in pulsed mode of operation. Due to its unique properties the thin disk laser (TDL) concept is an ideal platform for the generation of high optical power with excellent beam quality. Reliability, low brightness constraints for the pump source, insensitivity to back reflections, negligible nonlinearities, high scalability are a few inherent properties, and thus TDLs have been widely used in industrial applications. In the past there have been many efforts to reach the maximum output power keeping the beam quality close to the diffraction limit. Here we report on an enhanced system reaching 4 kW output power with a beam quality M2<1.2 over the full power range. The experimental setup consists of a multipass pump chamber which enables 22 passes through the active laser disk, two convex high-reflection (HR) mirrors, a spherically deformable mirror (SDM), an Yb-doped laser disk mounted on a heat sink and an outcoupling (OC) mirror. The OC is shaped such that static aspherical wavefront aberrations originating from the laser disk can be compensated. Using this approach, we demonstrate a 4 kW diffraction limited building block. Further power scaling can be achieved by using conventional combining methods such as polarization beam combining, spatial beam combining or disk multipass amplification.
关键词： high power,beam quality,thin disk laser,fundamental mode,diffraction limit
更新于2025-09-12 10:27:22
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Wide-Gamut and Polarization-Independent Structural Color at Optical Sub-diffraction-Limit Spatial Resolution Based on Uncoupled LSPPs
摘要： The decreasing pixel size of digital image sensors for high-resolution imaging brings a great challenge for the matching color filters. Currently, the conventional dye color filters with pixel size of several microns set a fundamental limit for the imaging resolution. Here, we put forward a kind of structural color filter with circular nanohole-nanodisk hybrid nanostructure arrays at sub-diffraction-limit spatial resolution based on the uncoupled localized surface plasmon polaritons (LSPPs). Due to the uncoupled LSPPs taking effect, the pixel could generate an individual color even though operating as a single element. The pixel size for the minimum color filtering is as small as 180 × 180 nm2, translating into printing pixels at a resolution of ~ 141,000 dots per inch (dpi). In addition, through both the experimental and numerical investigations, the structural color thus generated exhibits wide color gamut, large viewing angle, and polarization independence. These results indicate that the proposed structural color can have enormous potential for diverse applications in nanoscale optical filters, microscale images for security purposes, and high-density optical data storage.
关键词： Structural color,Wide color gamut,Uncoupled LSPP effect,Large viewing angle,Sub-diffraction-limit resolution,Polarization independence
更新于2025-09-11 14:15:04
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Subwavelength Artificial Structures: Opening a New Era for Engineering Optics
摘要： In the past centuries, the scale of engineering optics has evolved toward two opposite directions: one is represented by giant telescopes with apertures larger than tens of meters and the other is the rapidly developing micro/nano-optics and nanophotonics. At the nanoscale, subwavelength light–matter interaction is blended with classic and quantum effects in various functional materials such as noble metals, semiconductors, phase-change materials, and 2D materials, which provides unprecedented opportunities to upgrade the performance of classic optical devices and overcome the fundamental and engineering difficulties faced by traditional optical engineers. Here, the research motivations and recent advances in subwavelength artificial structures are summarized, with a particular emphasis on their practical applications in super-resolution and large-aperture imaging systems, as well as highly efficient and spectrally selective absorbers and emitters. The role of dispersion engineering and near-field coupling in the form of catenary optical fields is highlighted, which reveals a methodology to engineer the electromagnetic response of complex subwavelength structures. Challenges and tentative solutions are presented regarding multiscale design, optimization, fabrication, and system integration, with the hope of providing recipes to transform the theoretical and technological breakthroughs on subwavelength hierarchical structures to the next generation of engineering optics, namely Engineering Optics 2.0.
关键词： metasurfaces,plasmonics,flat optics,engineering optics,diffraction limit
更新于2025-09-10 09:29:36
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The Invention of an Optical Antenna—A Personal Reminiscence
摘要： The subject of this article is my personal path from the near-field optical (NFO) microscope to the optical antenna and its potential for modern optics.
关键词： breaking the diffraction limit,optical antenna,lifetime of Q-dots,nonlinearities,antenna resonance
更新于2025-09-09 09:28:46
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Reduced Graphene Oxide Nanostructures by Light: Going Beyond the Diffraction Limit
摘要： Graphene oxide (GO) offers excellent possibilities that are recently demonstrated in many applications ranging from biological sensors to optoelectronic devices. The process of thermal annealing aids in removing the oxygen-containing groups in GO, making GO more graphene-like, or the so-called reduced graphene oxide (rGO). Thermal reduction can also be achieved by intense light. Here, we demonstrate a scalable, inexpensive, and environmentally friendly method to pattern graphene oxide films beyond the diffraction limit of light using a conventional laser. We show that contrary to previous reports, non-linear effects that occur under high intensity conditions of laser irradiation allow the fabrication of highly conductive carbon nanowires with dimensions much smaller than the laser spot size. The potential of this method is illustrated by the fabrication of several devices on flexible and transparent substrates, including hybrid plasmonic/rGO sensors.
关键词： reduced graphene oxide,optoelectronic devices,laser reduction,Graphene oxide,diffraction limit
更新于2025-09-04 15:30:14