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A firefly drifts above a plain, featureless ground, its glow spreading broadly and fading into the dark—beautiful yet unfocused, long believed to be its natural fate. However, as the firefly crosses into a richly designed landscape shaped by flowers, pathways, and hidden guides, its journey changes: the land catches its light, redirects it, and gently returns it, so that with every pass the glow grows sharper and brighter, rising into a concentrated beacon. In the same way, plasmons—once thought doomed to broad, lossy spectra—can be transformed by engineering the photonic environment beneath a single nanoparticle, guiding and confining light to achieve spectral localization, and revealing that what seemed like a fundamental limitation is, in fact, a matter of design.
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SUTD
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