Hyoung-In Lee

• Ph.D., University of Illinois at Urbana-Champaign
• Researcher at Seoul National University

We revisit the Mie scattering in view of electromagnetic chirality, especially in the near field of a scattering sphere. To this goal, we take the simplest two-dielectric system where both an embedding medium and an embedded sphere are loss-free, non-magnetic, and dielectric. For a given linearly polarized incident wave, the net chirality should va...

An electric point dipole is the simplest model for emitters, antennas, and other nanostructures. For a dipole sufficiently small in comparison to the wavelength of the radiated electromagnetic wave, its electric-field intensity and Poynting vector are fully understood. Firstly, both decrease in magnitude with increasing radial distance from the dip...

We examine the shear states and vortices of rotational Couette flows with radial injection and suction. The gap of finite radius and infinite axial length lying between two concentric cylinders is assumed to be filled with incompressible Newtonian viscous fluids. To this goal, a rectilinear injected Couette flow is briefly reviewed as a preliminary...

We examine the surface phonon polaritons established on resonance between lossy silicon carbide and vacuum over the Reststrahlen frequency range. To this goal, we investigate two waves counter-propagating along a planar material interface in terms of the orbital and spin parts of the Poynting vector. Vortices of the spin part are thus found to be g...

We revisit the surface plasmon resonances established along a planar interface lying between a lossless dielectric and a lossy metal. By examining the orbital and spin parts of the Poynting vector, the mechanisms behind forward or backward flows are clearly illustrated. Consequently, we were able to construct more intuitive pictures of two-dimensio...

These days Ultra-compact modulators are seeking so much interest in their research area, because these are the main components of optical transmission systems and also Ultra-compact and ultra- high speed semiconductor electronic modulators are very significant for optoelectronic integrated circuits. The resonant modulators can be of very small size...

We investigate electromagnetic waves propagating through non-magnetic and loss-free dielectric media, but with spatially inhomogeneous refractive indices. We derive hence a set of analytic formulae for conservation laws and energy-current (Poynting) vector. As a result, we deduce that the energy-current vector cannot be neatly separated into its or...

We examine conservation laws of the energy and chirality for electromagnetic waves in the case of loss-free dielectric media. We show that the energy allows for conservation laws for both generic unsteady and time-harmonic fields. In comparison, the chirality admits a conservation law only for time-harmonic fields. This difference in the time depen...

Dynamics of two-member Markov processes is formulated based on the binomial probability. Sets of initial states are then sought such that the final state reaches an equilibrium. On the two-parameter phase plane, such initial states are found to exhibit diverse geometric configurations depending on the source probability. Those initial-state boundar...

We investigate electromagnetic waves propagating along a metallic wire with a closer look at multiple propagating modes. To this goal, metallic loss is examined for its influence on a hybrid wave. The number of resonance modes is found to strongly depend on the rotational azimuthal mode indices. Based on the highest quality factor, selections are m...

We investigate light spins for cylindrical electromagnetic waves on resonance. To this goal, we consider both a dielectric cylinder of infinite length immersed in vacuum and a cylindrical hole punched through a dense dielectric medium. In order for waves of constant frequencies to be established through lossless media, energy absorption is allowed...

Cylindrical electromagnetic waves have been examined mostly with a radiation condition applied at the radial far field. In modern optical technology, there are however growing number of applications where both radiation and absorption of energy should be taken into account. In order to illustrate the ramifications of such energy balance, we take pl...

We have investigated theoretically the possibility of control of magnetic speckle-pattern rotation in gyrotropic optical fiber coated by conductive nanoshell. Investigation has been carried out for graphene and silver coated fibers. In graphene-coated fiber speckle-pattern rotation may be tuned by both magnetic field and chemical potential of graph...

We make use of the well-known integral representation of Bessel function in order to derive higher-order rotational electromagnetic waves. For this purpose, we employ the simplest weighting function in carrying out an azimuthal averaging of an E-parallel-H wave. To our surprise, the resulting wave turns out to describe interactions between two co-r...

In this Letter, we investigate a magnetic field induced by guiding plasmonic modes in graphene-coated nanowire via an inverse Faraday effect. Magnetic field distribution for different plasmonic modes has been calculated. It has been shown that a magnetic field has a vortex-like distribution for some plasmonic modes. The possibility of producing mag...

This manuscript is a result of my self-study in trying to understand the difference betwen fermions and bosons. It took me about an year without leading to a publication in any open journal. It was a worhwhile endeavor though.

almost correct version of Optical Pump. I wish to invite readers to finding what is wrong with this manuscript. Currently, we are revising this manuscript by including a frequency-dispersive dielectric constant of metals.

The optical chirality of two axially propagating electromagnetic waves is investigated. These two waves of different nature are in counter-rotations, thereby being non-plane waves. From the resulting spatial distributions of energy and chirality, we find not only enhancements but also cancellations due to the interferences in these hybrid waves. In...

This study is motivated in part to better understand multiplexing in wireless communications, which employs photons carrying varying angular momenta. In particular, we examine both transverse electric (TE) and transverse magnetic (TM) waves in either co-rotations or counter-rotations. To this goal, we analyze both Poynting-vector flows and orbital...

The dynamics of a single particle moving on a flat plane are examined under the influence of state-dependent potentials. As a result, the electromagnetic Poynting-vector flows are captured for optical vortices driven by gain media. In particular, the signs of the coupling coefficients play a crucial role in establishing vortices. In this respect, t...

We examine electromagnetic waves propagating on the cross-sectional plane of a single cylindrical metal nanowire. For continuous waves to be sustained, gain medium is placed around the periphery of wire, thus compensating for the material loss of metal. The thickness of gain layer is assumed to be infinitely thin, whereby a threshold gain is define...

We examine the conservation of electromagnetic energy for systems involving metal-like constituents, not only for continuous waves with real frequencies but also for temporally attenuated waves with complex frequencies. For this purpose, we derive a generic conservation law in terms of attenuated time-harmonic waves, thereby identifying the dual ro...

External excitations are employed to investigate properties of optical media, with measurement data often analyzed via linear response theory. In this respect, external forcing is modeled here by well-known Poisson and negative-binomial distributions. Ensuing dynamics is examined with a special attention to the relative decay rates of damped harmon...

The Drude model for metal is extended to include complex relaxation rates. As a test for what happens to the surface plasmon resonances with such metals, the lifetime is examined for propagating waves across a single planar metal-dielectric interface. By analytically solving the dispersion relation being fourth-order in the complex frequency, group...

Wavenumber matching is crucial to proper designs of optical devices such as ring-bus waveguides or planar cavities. In particular, the range of in-plane wavenumbers needs to be adequately determined along the coupling direction. Oftentimes, numerically intensive search is necessary for its accurate determination for surface plasmon resonances in pa...

Back in 1990, D. S. Stewart and the first author contributed significantly to understanding the one-dimensional stability of detonation waves [1]. For this purpose, the reactive Euler's equation with the one-component reaction term was linearized around the steady state of the well-known ZND (Zeldovich-Doering-von Neumann) model. The key aspect of...

We propose a theoretical model to explain the mechanism of light wave propagation through non-metallic nanowires of sub-diffraction dimension. This model is assuming that unbound electrons on the surface of a non-metallic nanowire form an infinitesimally thin layer of quasi-free two-dimensional electron gas that is responsible for collective oscill...

Electromagnetic waves are considered for periodic structures consisting of lossy plasmonic components and dielectric host media. For the plasmonic components, not only low-loss metals but also high-loss gas plasmas are taken into consideration. For small filling fractions of the plasmonic components, the intercell interactions are kept to a minimum...

Loss-induced optical Bloch waves are investigated in a metal–dielectric semi-infinite multilayer placed over a substrate. In addition to the well-known classification of the electromagnetic waves into forward and backward waves, the electrostatics-based sub-classification elucidates one-level finer details of the wave nature. For this purpose, a hy...

Electromagnetic waves are examined for a single isolated nanoparticle, which is composed of lossy plasmonic components and immersed in an unbounded homogeneous dielectric host medium. Wave characteristics thus obtained on resonance play crucial roles as the zero-order solution for periodic structures such as linear particle chains. The dispersion r...

In the low-frequency limit with respect to the bulk plasma frequency of metal, damped surface-plasmon resonance is examined for a periodic semi-infinite structure with metal–dielectric unit cells in slab geometry. In comparison to the author’s earlier results in [1], the additional material damping is found to alter the resonance characteristics in...

Surface-plasmon resonance is examined for a periodic semi-infinite structure with metal-dielectric unit cells in slab geometry. Electromagnetic waves through this structure are analyzed for the frequencies close to but smaller than the metal’s plasma frequency. A distinguished limit is found to exist for a small metallic content along with a small...

As a part of nanophotonics, surface-plasmon resonance is examined for a periodic semi-infinite structure with metal?dielectric unit cells in slab geometry. The electromagnetic waves through this structure are analyzed in the low-frequency limit with respect to the bulk plasma frequency of metal. The lossless Drude model is employed throughout the p...

Wave propagation and surface plasmon resonance are examined in four-layer optical systems in slab geometry for an OLED (organic light-emitting diode) with an embedded thin metal film. For this purpose, both leaky and bound modes are examined in all ranges of the propagation constant, which determines how surface and volume waves are allowed. Intens...

Mathematical aspects of the electromagnetic surface-wave propagation are examined for the dielectric core consisting of multiple sub-layers, which are embedded in the gap between the two bounding cladding metals. For this purpose, the linear problem with a partial differential wave equation is formulated into a nonlinear eigenvalue problem. The res...

Metal-gap waveguides, where dielectric cores are surrounded by metallic claddings, attract renewed interests thanks to their unique characteristics both in surface plasmon resonance and in low-dimensional wave propagation. Here presented are new findings from analyzing cylindrical wave propagation through the core consisting of multiple layers with...

Cooling of electronic components is often limited by space availability and power consumption. Capillary-pumped loops (CPL) are utilized to achieve a coolant circulation via self-activated capillarity (Faghri, 1995). However, CPL is extremely unstable due to a nonlinear feedback among capillarity, viscous force, and heat transfer. Conventional refr...

Nonlinear hyperbolic differential equations have been a subject of intense research in the field of gas dynamics due to many engineering problems associated with high-speed airplanes, missiles, materials processing, etc. Recently, phenomena known from gas dynamics are found to occur also in the microeletronic devices such as MOSFET. Here a few inte...

The detonation stability problem is studied by a normal mode approach which greatly simplifies the calculation of linear instability of detonation in contrast to the Laplace transform procedure used by Erpenbeck. The method of solution, for an arbitrary parameter set, is a shooting method which can be automated to generate easily the required infor...