A5056958252- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Thermal Radiation and Cooling Technologies
- Photonic Crystals and Applications
- Metamaterials and Metasurfaces Applications
- Near-Field Optical Microscopy
- Gold and Silver Nanoparticles Synthesis and Applications
- Orbital Angular Momentum in Optics
- Advanced Fiber Optic Sensors
- Advanced Thermoelectric Materials and Devices
- Vector-borne infectious diseases
- Advanced Thermodynamics and Statistical Mechanics
- Optical and Acousto-Optic Technologies
- Plant Pathogenic Bacteria Studies
- Toxin Mechanisms and Immunotoxins
- Genomics and Phylogenetic Studies
- Advanced Antenna and Metasurface Technologies
- Optical Systems and Laser Technology
- Insect symbiosis and bacterial influences
- Control and Stability of Dynamical Systems
- Antimicrobial Peptides and Activities
- Mechanical and Optical Resonators
- Diatoms and Algae Research
- Electromagnetic Scattering and Analysis
University of Wisconsin–Madison
2019-2024
California Institute of Technology
2014-2024
Samsung (South Korea)
2023
Kyungpook National University
2020
Institute of Photonic Sciences
2020
Korea Advanced Institute of Science and Technology
2018
Cooper Union
2012
Seoul National University
2005-2010
Agency for Defense Development
2008
Seoul National University of Science and Technology
2008
Infrared transmission measurements reveal the hybridization of graphene plasmons and phonons in a monolayer hexagonal boron nitride (h-BN) sheet. Frequency-wavevector dispersion relations electromagnetically coupled plasmon/h-BN phonon modes are derived from measurement nanoresonators with widths varying 30 to 300 nm. It is shown that plasmon mode split into two distinct optical display an anticrossing behavior near energy h-BN at 1370 cm–1. We explain this as classical electromagnetic...
All matter at finite temperatures emits electromagnetic radiation due to the thermally induced motion of particles and quasiparticles. Dynamic control this could enable design novel infrared sources; however, spectral characteristics radiated power are dictated by energy density emissivity, which ordinarily fixed properties material temperature. Here we experimentally demonstrate tunable electronic blackbody emission from graphene plasmonic resonators on a silicon nitride substrate. It is...
Graphene nanostructures that support surface plasmons have been utilized to create a variety of dynamically tunable light modulators, motivated by theoretical predictions the potential for unity absorption in resonantly-excited monolayer graphene sheets. Until now, generally low efficiencies resonant absorbers limited mismatch between free-space photons and plasmons. Here, we develop nanophotonic structures overcome this demonstrate electronically perfect achieved with patterned graphenes...
Scrub typhus is caused by the obligate intracellular rickettsia Orientia tsutsugamushi (previously called Rickettsia tsutsugamushi). The bacterium maternally inherited in trombicuid mites and transmitted to humans feeding larvae. We report here 2,127,051-bp genome of Boryong strain, which represents most highly repeated bacterial sequenced date. repeat density scrub pathogen 200-fold higher than that its close relative prowazekii, agent epidemic typhus. A total 359 tra genes for components...
The optical absorption properties of periodically patterned graphene plasmonic resonators are studied experimentally as the sheet is placed near a metallic reflector. By varying size and carrier density graphene, parameters for achieving surface impedance closely matched to free-space $({Z}_{0}\phantom{\rule{0.16em}{0ex}}=\phantom{\rule{0.16em}{0ex}}377\phantom{\rule{0.16em}{0ex}}\ensuremath{\Omega})$ determined shown result in 24.5% total sheet. Theoretical analysis shows that complete...
Abstract Subwavelength metallic slit arrays have been shown to exhibit extraordinary optical transmission, whereby tunnelling surface plasmonic waves constructively interfere create large forward light propagation. The intricate balancing needed for this interference occur allows resonant transmission be highly sensitive changes in the environment. Here we demonstrate that resonance can coupled electrostatically tunable graphene ribbons electrostatic modulation of mid-infrared light....
Abstract Integrating and manipulating the nano-optoelectronic properties of Van der Waals heterostructures can enable unprecedented platforms for photodetection sensing. The main challenge infrared photodetectors is to funnel light into a small nanoscale active area efficiently convert it an electrical signal. Here, we overcome all those challenges in one device, by efficient coupling plasmonic antenna hyperbolic phonon-polaritons hexagonal-BN highly concentrate mid-infrared graphene p n...
Dynamic high-resolution wavefront modulation of light is a long-standing quest in photonics. Metasurfaces have shown potential for realizing manipulation with subwavelength resolution through nanoscale optical elements, or metaatoms, to overcome the limitations conventional spatial modulators. State-of-the-art active metasurfaces operate via phase and their inability also independently control scattered amplitude leads an inferior reconstruction desired wavefronts. This fundamental problem...
The authors propose a method for the off-axis directional beaming of optical field diffracted by single subwavelength metal slit with dielectric surface gratings. In proposed method, gratings are optimally designed to directionally couple plasmon polariton modes induced into surrounding medium along specific direction. Design and analysis conducted based on rigorous coupled wave method. Their simulation shows oblique angle, 20.2°, respect axis angle can be changed adjusting grating periods.
A method for optical beam focusing by a single subwavelength metal slit surrounded surface gratings is proposed. In our proposed method, the period of each grating chirped so that radiation fields plasmon polaritons can be controlled to make spot at desired focal length. Through it numerically shown we which located several times wavelength distance from slit, and its length controlled.
Abstract In this review, an overview of the subwavelength confinement light with plasmonics is presented. Among varieties state-of-the-art technologies on intensively-studied topic, we focus surface plasmon-assisted enhancement via single metallic aperture. Based a systematic physical principles in subwavelength-sized apertures, investigate various types apertures and discuss their characteristics. Keywords: plasmonsurface plasmon resonancesurface polaritonsoptical aperture...
Orientia tsutsugamushi, the causative agent of scrub typhus, is an obligate intracellular bacterium. The pathogen's mechanism cellular invasion poorly characterized.Through ligand immunoblots, glutathione S-transferase (GST) pull-down assays, and in vitro inhibition assays invasion, a bacterial was identified shown to interact with fibronectin (Fn) enhance O. tsutsugamushi.O. tsutsugamushi can bind immobilized Fn vitro, exogenous stimulates mammalian host cells. Bacterial presence abrogated...
Abstract Despite high scientific and technological potential, nanophotonics research in the mid‐infrared regime remains relatively less explored compared to other frequency bands, largely because requires a totally different set of optical materials. Polaritons layered 2D materials, or van der Waals (vdW) crystals, provide new building blocks for nanophotonics. Herein, recently reported polaritonic properties various vdW crystals are summarized context their applications. Both polaritons...
We investigate the reflection and transmission characteristics of low-dielectric constant cut off barrier in metal-insulator-metal (MIM) waveguide propose a novel plasmonic nano-cavity made two barriers between them. It is shown that anti-symmetric mode MIM with core low dielectric below specific value cannot be supported this region can regarded as high stability. The phase shift due to at finite-length calculated design scheme cavity length for resonant tunneling presented. spectra through...
Abstract Orientia tsutsugamushi , an obligate intracellular bacterium, is the causative agent of Scrub typhus. The control mechanisms for bacterial gene expression are largely unknown. Here, global O. within eukaryotic cells was examined using a microarray and proteomic approaches first time. These identified 643 genes, corresponding to approximately 30% genes encoded in genome. majority expressed belonged several functional categories including protein translation, processing/secretion,...
We analyze and propose a thin-film patterning method based on Kretschmann's attenuated total reflection (ATR) configuration where the surface plasmon mode coupled waveguide modes into target photosensitive layer are generated. By analyzing stratified media with help of extended transfer matrix method, we numerically visualize electromagnetic fields waves modes. Through interference these modes, it is to be shown that our proposed can used in optical lithography, especially for methods....
We propose an exact design, analysis, and visualization method for multiple surface plasmon resonance (MSPR) mode excitation phenomena a structure composed of optimized-thickness polymethyl-methacrylate layer gold thin-film layer. The proposed simulation is based on recursive transfer matrix (R-TMM) Gaussian angular spectrum decomposition. Our illustrates, under the Kretchmann-Raether attenuated total reflection (ATR) geometry, response angle-modulated incident beam. To verify results we...
Plasmonic off axis beaming and focusing of light by the use asymmetric or non-periodic dielectric gratings around a metallic slit are experimentally demonstrated. The far-field probing was done holographic microscopy. While conventional near-field microscopes can probe only near-fields, our four-step phase-shift interferometer provides an efficient way reconstructing paths coming out from plasmonic devices. We hope experimental work contributes to practical applications plasmonics such as...
According to the authors' calculations, overall transmission through a graphene-loaded nanogap in waveguide can be completely suppressed, leading extremely high modulation efficiency, by slightly shifting Fermi level of graphene. The active length device is about 2% free-space wavelength, so its effective volume could 1/1000 diffraction-limited volume. By reducing capacitance, small area beneficial for not only high-density integration, but also high-speed, low-energy operation. This work...
A method for rendering bundle beams by utilizing the destructive interference effects of from multiple subwavelength slits surrounded dielectric surface gratings is proposed. With oblique incident light on slits, it possible to control phases plasmon polaritons (SPPs) induced in slits. When these have a certain relationship, SPPs excited corrugated render separated or beams, as interfering destructively. Because interference, separation between clear. In addition, beam width narrow, degree...
A wavelength-band selection filter using a metal-coated polymer holographic grating and utilizing surface plasmon resonance for use in optical wireless communication is proposed. The proposed device mainly composed of total internal reflection prism, the hypotenuse which covered with volumetric grating. feasibility as was tested experimentally
This paper presents the design, implementation and evaluation of a thermoelectric-based point use power generation system with no moving parts. The was designed to be robust stable, capable being clamped onto outer wall hot steam pipe temperature over 160°C using only heat pipes natural convection ambient air for cooling. Several systems were built tested. One tested at Cooper Union in New York City. evaluated different temperatures. other attached an 85°C geothermal water 100–120°C Iceland....