A5081166352- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- 2D Materials and Applications
- Graphene research and applications
- Perovskite Materials and Applications
- Optical Coatings and Gratings
- Chalcogenide Semiconductor Thin Films
- Gas Sensing Nanomaterials and Sensors
- Gold and Silver Nanoparticles Synthesis and Applications
- Solid State Laser Technologies
- Biosensors and Analytical Detection
- Laser-Matter Interactions and Applications
- Photorefractive and Nonlinear Optics
- Advanced Semiconductor Detectors and Materials
- MXene and MAX Phase Materials
- Bone Tissue Engineering Materials
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Photoacoustic and Ultrasonic Imaging
- Molecular Junctions and Nanostructures
- Spectroscopy Techniques in Biomedical and Chemical Research
- Thermal Radiation and Cooling Technologies
- Advanced Biosensing Techniques and Applications
- Quantum and electron transport phenomena
Convergence
2025
Pusan National University
2023-2025
Chungnam National University
2015-2020
Korea Research Institute of Standards and Science
2015-2020
Government of the Republic of Korea
2020
Quantum Technology Sciences (United States)
2020
Konkuk University
2018
Hexagonal boron nitride (h‐BN) is being widely utilized as a platform for optical and electrical devices exploiting two‐dimensional layered materials. By analyzing transmission spectra of h‐BN flakes transferred onto quartz plates with the transfer‐matrix method, refractive index determined in wavelength range from 450 to 1200 nm. The are reproduced by applying single oscillator model n ( λ ) 2 = 1 + Aλ /( –λ 0 wavelength‐dependent index. Averaging over parameters different samples, 164.4 nm...
Abstract Inelastic electron tunneling spectroscopy is a powerful technique for investigating lattice dynamics of nanoscale systems including graphene and small molecules, but establishing stable tunnel junction considered as major hurdle in expanding the scope experiments. Hexagonal boron nitride pivotal component two-dimensional Van der Waals heterostructures high-quality insulating material due to its large energy gap chemical-mechanical stability. Here we present planar graphene/ h...
Nitrate-nitrogen (NO3-N) is a major contaminant in groundwater and seawater. Significant amounts of ammonia are oxidized to nitrate through nitrification, leading an imbalance the nitrogen cycle causing pollution water bodies. Controlling NO3-N levels significant challenge for both marine aquaculture human health. Traditional measurement methods, such as ion chromatography continuous flow analysis, require pretreatment steps detect complex matrices, which time-consuming. However, this study,...
We report surface plasmon (SP) lasing in metal/semiconductor nanostructures, where one-dimensional periodic silver slit gratings are placed on top of an InGaAsP layer. The SP nature the is confirmed from emission wavelength governed by grating period, polarization analysis, spatial coherence, and comparison with linear transmission. excellent performance device as source demonstrated its tunable 400-nm-wide telecom band at room temperature. show that stimulated enhanced Purcell effect...
With performing time-resolved pump-probe experiments using femtosecond optical pulses, we investigate temperature dependent transition of the structural phase in single crystalline (SC) VO2 plates and polycrystalline films. Analysis coherent phonons with change has revealed M1-M2 within insulating SC VO2. In stark contrast, no evidence on M2 was found a film composed multi-grains. The results demonstrate that strain is an important parameter transitions VO2, which determines not only...
Although single-layer transition-metal dichalcogenides with novel valley functionalities are a promising candidate to realize valleytronic devices, the essential understanding of depolarization mechanisms is still incomplete. Based on pump-probe experiments performed for MoSe2 and WSe2 monolayers corroborating analysis from density functional calculations, we demonstrate that coherent phonons at K-point Brillouin zone can effectively mediate transfer electron carriers. In monolayer case,...
An optical parametric oscillator (OPO) based on magnesium-oxide-doped periodically poled lithium niobate (MgO:PPLN) is demonstrated to deliver visible femtosecond pulses, which were created through the intra-cavity nonlinear interactions within PPLN itself. The signal from OPO produces pulses in near-infrared region tunable 1050 1600 nm. Visible range of 522-800 nm and those 455-540 nm, respectively, generated via second-harmonic generation (SHG) photons sum-frequency (SFG) pump photons....
Metabolome analysis has gained widespread application in disease diagnosis owing to its ability provide comprehensive information, including phenotypes. In this study, we utilized 3D superstructures fabricated through evaporation-induced microprinting analyze the metabolome for glaucoma diagnosis. offer following advantages: high hotspot density per unit volume of structure extending from two three dimensions, excellent signal repeatability due reproducibility and defect tolerance printing,...
Frequency-dependent dielectric constant dispersion of monolayer WSe2, ε(ω)=ε1(ω)+i ε2(ω), was obtained from simultaneously measured transmittance and reflectance spectra. Optical transitions the trion as well A-, B-, C-excitons are clearly resolved in ε2 spectrum. A consistent Kramers-Kronig transformation between ε1 spectra support validity applied analysis. It is found that A- B-exciton splitting case double-layer WSe2 can be attributed to spin-orbit coupling, which larger than WSe2. In...
We demonstrate strong modulation of the transmission around surface plasmon polariton (SPP) resonance in metal/semiconductor hybrid nanostructures based on Ag film top InGaAs. The change real and imaginary parts refractive index due to photoexcited carriers InGaAs generates a shift SPP enhanced near resonance. Temporal evolution complex was traced by comparing transient with finite-difference time-domain (FDTD) simulations.
We report a cavity-dumped optical parametric oscillator (OPO) with ring-type cavity configuration, which is based on periodically poled lithium niobate gain synchronously pumped by mode-locked Ti:sapphire laser. Because of reduced loss and group velocity dispersion inherent to ring-cavity employment, wide wavelength tuning capability from 1.02 1.65 μm was achieved the simple displacement mirror. At 1.28 μm, system provides femtosecond pulses 42 nJ energy 50% dumping efficiency. The delay...
Various sensor applications have been developed for protection against hazardous environments, and research on functional materials to enhance performance has also pursued. The M13 bacteriophage (M13) found utility in like disease diagnosis detection of harmful substances due its potential controlling interaction with target through adjustments electrochemical mechanical properties via genetic engineering technology. However, while optimizing reactivity or binding affinity between is crucial...
Interfacial bubbles are unintentionally created during the transfer of atomically thin 2D layers, a required process in fabrication van der Waals heterostructures. By encapsulating WSe2 monolayer hBN, we study differing photoluminescence (PL) properties structure resulting from bubble formation. Based on differentiated absorption probabilities at compared to pristine areas, demonstrate that visibility PL mapping is enhanced when photoexcitation wavelength lies between n = 1 and 2 resonances...
Coherent phonon dynamics of single-layer graphene (SLG) and multi-layer (MLG) on sapphire substrate were investigated using femtosecond pump-probe techniques. The center peak G-mode redshift with the number layer temperature increases in range between 300 K 900 K. Also, dephasing time upshift from 0.82 ps to 1.14 as increases. This results reflect thermal expansion damping constant SLG MLG.