In this novel multimodal wide-field Raman microscope, spectra are obtained by the time-domain Fourier-transform method. The wide-field approach enables faster collection of Raman maps, while the time-domain method disentangles fluorescence and Raman signals. This is obtained by choosing a proper sampling of the interferogram, thanks to the use of an ultrastable common-path birefringent interferometer. Validation of the system is performed on plastic microbeads; multimodality is demonstrated by fluorescence and Raman maps of a few-layers transition metal dichalcogenide sample.
We present a novel wide-field Raman microscope, based on the time-domain Fourier-transform method. This enables parallel acquisition of Raman spectra on all the pixels of the 2D detector; the resulting wide-field approach allows faster collection of Raman maps with respect to standard raster-scanning methods. In addition, the time-domain method disentangles fluorescence and Raman signals. The system is robust and stable, thanks to the use of an ultrastable common-path birefringent interferometer. Validation of the system is performed on plastic microbeads and on a few-layers transition metal dichalcogenide sample.
Optical parametric amplification is a coherent mechanism whereby an optical signal is amplified by a pump via the generation of an idler field and it is the key ingredient of parametric oscillators. Here we demonstrate optical parametric amplification by monolayer transition-metal dichalcogenides, showing that amplification can be attained over a propagation through an atomic layer. The surface-like second-order nonlinear interaction bypasses phase-matching constraints, enabling ultrabroadband collinear amplification, generally unattainable due to material dispersion. Moreover, the amplification process is invariant over signal and pump in-plane polarizations. Our experimental findings pave the way for innumerable applications in nanophotonics and quantum information technology.
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