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optical nonlinearity, that will be intrinsically weak in silicon. To enhance the nonlinear response, practical programs rely on resonant frameworks such microring resonators or photonic crystals. Nevertheless, their typical footprints are bigger than 10 μm. Here, we reveal that 100 nm silicon nano-resonators show a huge photothermal nonlinearity, producing 90% reversible and repeatable modulation from linear scattering response at low excitation intensities. Very same nonlinear index is five-ord
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