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Mid-infrared photothermal heterodyne imaging (MIR-PHI) overcomes the diffraction limit of traditional MIR imaging and uses visible photodiodes as detectors. Our MIR-PHI experiment achieved high sensitivity (S/N >100), sub-diffraction limit spatial resolution and high acquisition speed. Sensitive, affordable and widely applicable, this technique is a promising imaging tool for biological systems.
© 2016 Optical Society of America
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