고희동 연구실

Nonreciprocal or nonlinear constitutive relations can induce unusual phenomena such as extinction asymmetry, directional transparency, or second harmonic generation. We develop theoretical backgrounds and inverse-design frameworks to harness anomalous scattering.

Wave-based analog computing aims to provide a fast, energy-efficient, and massively parallel computation beyond the limitation of digital processors by engineering wave-material interaction.

The dispersion relation of a medium discloses wave propagation characteristics. We develop design methods for metamaterials and structures driven by user-defined target dispersive behavior: group velocity-based inverse design and discriminant-based inverse design for band-gap control.

A perfectly matched layer (PML) is the most effective numerical scheme to simulate wave propagation in a heterogeneous unbounded domain. We propose a new formulation of PML for computational efficiency and stability.

Time reversal wave focusing is used widely in imaging and energy delivery. We develop resolution-improving filters for time-reversal applications with switching TR mirror and multi-target energy focusing for oil recovery applications.

Subsurface imaging is an essential tool for site investigation and infrastructure monitoring. We developed reduced- and full-waveform inversion for imaging a medium's elastic properties.

Strong interfacial responses between a solid and fluid can be measured and compared with simulations to identify the medium's properties. We develop a numerical model to simulate wave propagation in a solid-fluid coupled medium.