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Verified CAS / Academic Author2 Decoded Studies

Prof. Trevon Badloe

Korea University, Department of Electronics and Information Engineering

Co-Affiliations:Pohang University of Science and Technology (POSTECH)

Research Publications & English Decoded Briefs

Showing 2 publications
Opto-Electronic Advances (光电进展)2026DOI: 10.29026/oea.2026.250263

AI-assisted metaphotonics: A Comprehensive Review of Artificial Intelligence-Driven Approaches for Metaphotonic Systems

The convergence of artificial intelligence (AI) and metaphotonics is creating a new paradigm for controlling light-matter interactions. The synergy of AI's ability to learn complex relationships in multidimensional data and provide ultra-fast inference with the capacity of metaphotonics to engineer optical properties not found in nature is unlocking a new era in computational design, real-time control, and fully automated optical systems. This review provides a comprehensive overview of state-of-the-art AI-driven approaches for metaphotonic systems. We focus on the solutions to real-world problems in accelerating metaphotonic simulations and inverse design, optical data characterization, and the development of fully integrated end-to-end AI-assisted metaphotonic systems. Finally, we provide our perspectives on the future research directions and emerging opportunities at the rapidly evolving intersection of metaphotonics and AI.

Opto-Electronic Advances (光电进展)2026DOI: 10.29026/oea.2026.250216

Millisecond-level electrically switchable metalens for adaptive rotational depth mapping and diffraction-limited imaging

The intrinsic trade-off between depth-of-focus and lateral resolution in conventional optical systems constrains three-dimensional imaging in compact form factors. This work demonstrates an electrically tunable dual-mode metalens that integrates hydrogenated amorphous silicon (a-Si:H) meta-atoms with a liquid crystal (LC) modulator to independently manipulate left- and right-circularly polarized (LCP/RCP) light at 635 nm. Under LCP illumination, the metalens generates a rotating double-helix point spread function (PSF) encoding depth via rotation angle; under RCP illumination, it produces an extended depth-of-focus with a narrow PSF for high-resolution imaging. Propagation and geometric phases were co-optimized via rigorous coupled-wave analysis (RCWA), yielding high transmittance and precise phase control. Experimental characterization confirmed near-diffraction-limited lateral and axial resolutions. The integrated LC cell enables millisecond-scale polarization switching between depth-sensitive and high-resolution modes. Depth extraction was validated by correlating rotation angles of dual-image focal spots under mixed-polarization illumination, with axial displacements of Δz1 = 30.5 μm, Δz2 = 0 μm, and Δz3 = −48.3 μm corresponding to rotation angles β = −25.6°, 0°, and 16.9°, respectively. Depth-resolved imaging of a rubber-tree leaf, skeletal-muscle cross-section, and live planarian retrieved color-coded depth maps, demonstrating efficacy on complex biological tissues. This polarization-driven platform offers a compact solution for biomedical imaging, three-dimensional sensing, and adaptive optics.