Chongfan Technology
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10
2026
-
09
Electro‑controlled dual‑focus metalens for deep‑tissue expansion in photoacoustic imaging
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The teams of Junsuk Rho and Chulhong Kim at Pohang University of Science and Technology have developed a photoacoustic microscopy (meta-PAM) system based on electrically tunable dual‑focus metalenses, designed to extend the axial field of view to 1.2 mm while maintaining a high lateral resolution of 3.7 μm. The system employs silicon nitride nanostructured metalenses that can switch between two diffraction‑limited focal modes across the visible wavelength range without mechanical motion; the switching voltages are 0.87 V and 1.03 V, with a response time of 250 ms. By imaging chemically induced corneal burns in rat eyes, the authors validated the system’s performance and successfully monitored neovascularization at high resolution throughout the entire ocular depth. This compact and efficient platform lays the groundwork for future volumetric imaging with higher signal‑to‑noise ratios and superior spatial resolution.
The research findings were published on September 4, 2026, in Light: Science & Applications, under the title “Electrically switchable dual-focus metalens for depth-extended in vivo photoacoustic imaging of ophthalmic vascular disease.”
Figure 1: Schematic diagram of the electrically controlled dual-focus meta-PAM.
Figure 2: Optical properties of SiN under different deposition conditions
Figure 3: Design Method for a Dual-Focal Superlens
Figure 4: Characterization of the bifocal meta-PAM.
Figure 5: Photoacoustic imaging of nylon thread and leaf skeleton
Figure 6: Label-free in vivo photoacoustic imaging of the rat eye
Source: Optics World
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