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Assessing the near-field distribution of plasmonic nanoantennas offers fundamental insight into light-matter coupling. In particular resonantly enhanced near-field intensities in the IR and THz region are important since the molecular fingerprints of various molecules are situated in this spectral domain.
We directly map plasmonic near-field intensities by resonantly enhanced infrared far-field spectroscopy. We position a nanoscopic molecular probe at different locations of plasmonic rod and gap-type antennas and measure the vibrational signal with FTIR spectroscopy.
We present a basic building block for the realization of integrated active plasmonic devices: a distributed-feedback semiconductor laser working at room temperature and λ=1.3μm obtained with metal patterning on a thinned top cladding.
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