Juemin Yi
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View article: 70.7% slope-efficiency, mid-infrared tunable Fe:ZnSe laser gain-switched by high-energy 3.47 μm KTA optical parametric oscillator and amplifier
70.7% slope-efficiency, mid-infrared tunable Fe:ZnSe laser gain-switched by high-energy 3.47 μm KTA optical parametric oscillator and amplifier Open
View article: Transient Carrier Transport Mechanisms in GaN-Based Micro-LEDs under Femtosecond Photoexcitation
Transient Carrier Transport Mechanisms in GaN-Based Micro-LEDs under Femtosecond Photoexcitation Open
GaN-based Micro-LEDs, representative devices of third-generation wide-bandgap semiconductors, exhibit significant nonlinear photoluminescence (PL) properties under ultrafast femtosecond laser excitation, governed predominantly by multiphot…
View article: Unintentional Fe incorporation in the homo-epitaxy of GaN on Fe-doped freestanding GaN substrate
Unintentional Fe incorporation in the homo-epitaxy of GaN on Fe-doped freestanding GaN substrate Open
The unintentional Fe incorporation in the homo-epitaxy of GaN on Fe-doped freestanding GaN substrate is harmful to the performance of a high-electron-mobility transistor device, but the incorporation mechanism is unclear. The memory effect…
View article: Two-Photon and Three-Photon Excitation in Gan by Spectrally Broadband and Few-Cycle Laser Pulses
Two-Photon and Three-Photon Excitation in Gan by Spectrally Broadband and Few-Cycle Laser Pulses Open
View article: High-efficiency polarized GaN light-emitting diode based on asymmetric metal nanograting metasurfaces
High-efficiency polarized GaN light-emitting diode based on asymmetric metal nanograting metasurfaces Open
View article: Effect of Ti Contact Layer Thickness and Annealing on Ohmic Contacts to N-Face Fe-doped Semi-Insulating GaN
Effect of Ti Contact Layer Thickness and Annealing on Ohmic Contacts to N-Face Fe-doped Semi-Insulating GaN Open
View article: Leakage current in GaN-on-GaN vertical GaN SBDs grown by HVPE on native GaN substrates
Leakage current in GaN-on-GaN vertical GaN SBDs grown by HVPE on native GaN substrates Open
This study investigates leakage mechanisms in vertical GaN-on-GaN Schottky barrier diodes (SBDs) and demonstrates effective mitigation strategies. The fabricated devices exhibit low reverse leakage current (1 × 10−5 A/cm2 at −200 V) and a …
View article: Interband transition physics from the absorption edge in GaN: New prospects from numerical analysis
Interband transition physics from the absorption edge in GaN: New prospects from numerical analysis Open
The strong polarization effects and abundant surface states in III-nitrides result in a tunable electric field, modifying the absorption/emission by changing the band structure. Thus, the mechanism of the electric field and the absorption/…
View article: Double-sided asymmetric metasurfaces achieving sub-microscale focusing from a GaN green laser diode
Double-sided asymmetric metasurfaces achieving sub-microscale focusing from a GaN green laser diode Open
We proposed and demonstrated a highly efficient sub-microscale focusing from a GaN green laser diode (LD) integrated with double-sided asymmetric metasurfaces. The metasurfaces consist of two nanostructures in a GaN substrate: nanogratings…
View article: Origin of Zenneck-like waves excited by optical nanoantennas in non-plasmonic transition metals
Origin of Zenneck-like waves excited by optical nanoantennas in non-plasmonic transition metals Open
The scattering properties of metallic optical antennas are typically examined through the lens of their plasmonic resonances. However, non-plasmonic transition metals also sustain surface waves in the visible. We experimentally investigate…
View article: Dynamical manipulation of a dual-polarization plasmon-induced transparency employing an anisotropic graphene-black phosphorus heterostructure
Dynamical manipulation of a dual-polarization plasmon-induced transparency employing an anisotropic graphene-black phosphorus heterostructure Open
Dynamical tunable plasmon-induced transparency (PIT) possesses the unique characteristics of controlling light propagation states, which promises numerous potential applications in efficient optical signal processing chips and nonlinear op…
View article: Dynamically tunable coherent perfect absorption in topological insulators at oblique incidence
Dynamically tunable coherent perfect absorption in topological insulators at oblique incidence Open
The effective engineering of light absorption has been the focus of intensive research to realize the novel optoelectronic devices based on a topological insulator, a unique topologically protected surface Dirac-state quantum material with…
View article: Femtosecond Field‐Driven On‐Chip Unidirectional Electronic Currents in Nonadiabatic Tunneling Regime
Femtosecond Field‐Driven On‐Chip Unidirectional Electronic Currents in Nonadiabatic Tunneling Regime Open
Recently, asymmetric plasmonic nanojunctions have shown promise as on‐chip electronic devices to convert femtosecond optical pulses to current bursts, with a bandwidth of multi‐terahertz scale, although yet at low temperatures and pressure…
View article: Femtosecond field-driven on-chip unidirectional electronic currents in nonadiabatic tunnelling regime
Femtosecond field-driven on-chip unidirectional electronic currents in nonadiabatic tunnelling regime Open
Recently, asymmetric plasmonic nanojunctions [Karnetzky et. al., Nature Comm. 2471, 9 (2018)] have shown promise as on-chip electronic devices to convert femtosecond optical pulses to current bursts, with a bandwidth of multi-terahertz sca…
View article: Wideband tunable perfect absorption of graphene plasmons via attenuated total reflection in Otto prism configuration
Wideband tunable perfect absorption of graphene plasmons via attenuated total reflection in Otto prism configuration Open
A strategy is proposed to achieve wideband tunable perfect plasmonic absorption in graphene nanoribbons by employing attenuated total refraction (ATR) in Otto prism configuration. In this configuration, the Otto prism with a deep-subwavele…
View article: Generating Ultrabroadband Deep-UV Radiation and Sub-10 nm Gap by Hybrid-Morphology Gold Antennas
Generating Ultrabroadband Deep-UV Radiation and Sub-10 nm Gap by Hybrid-Morphology Gold Antennas Open
We experimentally investigate the interaction between hybrid-morphology gold optical antennas and a few-cycle Ti:sapphire laser up to ablative intensities, demonstrating rich nonlinear plasmonic effects and promising applications in cohere…
View article: Coexistence of two graphene-induced modulation effects on surface plasmons in hybrid graphene plasmonic nanostructures
Coexistence of two graphene-induced modulation effects on surface plasmons in hybrid graphene plasmonic nanostructures Open
Integrating gate-tunable graphene with plasmonic nanostructures or metamaterials offers a great potential in achieving dynamic control of plasmonic response. While remarkable progress has been made in realizing efficient graphene-induced m…
View article: Strong Spatial and Spectral Localization of Surface Plasmons in Individual Randomly Disordered Gold Nanosponges
Strong Spatial and Spectral Localization of Surface Plasmons in Individual Randomly Disordered Gold Nanosponges Open
Porous nanosponges, percolated with a three-dimensional network of 10 nm sized ligaments, recently emerged as promising substrates for plasmon-enhanced spectroscopy and (photo)catalysis. Experimental and theoretical work suggests surface p…
View article: Graphene-assisted multilayer structure employing hybrid surface plasmon and magnetic plasmon for surface-enhanced vibrational spectroscopy
Graphene-assisted multilayer structure employing hybrid surface plasmon and magnetic plasmon for surface-enhanced vibrational spectroscopy Open
A graphene-assisted vertical multilayer structure is proposed for high performance surface-enhanced Raman scattering (SERS) and surface-enhanced infrared absorption (SEIRA) spectroscopies on a single substrate, employing simultaneous local…
View article: Magnetic plasmons in a simple metallic nanogroove array for refractive index sensing
Magnetic plasmons in a simple metallic nanogroove array for refractive index sensing Open
Magnetic plasmons (MPs) refer to the coupling of external electromagnetic waves with a strong magnetic response induced inside the nanostructures. MPs have been widely employed as artificial magnetic atoms to fabricate negative-permeabilit…
View article: Mode energy of graphene plasmons and its role in determining the local field magnitudes
Mode energy of graphene plasmons and its role in determining the local field magnitudes Open
We theoretically study the mode energy of graphene plasmons and its fundamental role in determining the local field magnitudes. While neglecting the magnetic field energy of the mode, we derive a concise expression for the total mode energ…
View article: Strong coherent coupling between graphene surface plasmons and anisotropic black phosphorus localized surface plasmons
Strong coherent coupling between graphene surface plasmons and anisotropic black phosphorus localized surface plasmons Open
The anisotropic plasmons properties of black phosphorus allow for realizing direction-dependent plasmonics devices. Here, we theoretically investigated the hybridization between graphene surface plasmons (GSP) and anisotropic black phospho…