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Emerging technologies for integrated optical circuits demand novel approaches and materials. This includes a search for nanoscale waveguides that should satisfy criteria of high optical density, small cross‐section, technological feasibility and structural perfection. All these criteria are met with self‐assembled gallium phosphide (GaP) epitaxial nanowires. In this work, the effects of the nanowire...
We demonstrate efficient and broadband nonlinear nano-optics in plasmonic nano-focusing with nanometer localized four-wave mixing. We achieve deterministic optical control and nano-spectroscopic imaging of graphene as the basis for extension of multidimensional spectroscopy to the nanoscale.
Tip-enhanced Raman spectroscopy at cryogenic temperatures probes the intrinsic linewidths of vibrational modes. Temperature dependent investigation of small ensembles reveals ultrafast vibrational relaxation dynamics, conformational heterogeneity, and single molecule fluctionality on the time scale of seconds.
Since its first experimental realization, tip‐enhanced Raman spectroscopy (TERS) has emerged as a potentially powerful nanochemical analysis tool. However, questions about the comparability and reproducibility of TERS data have emerged. This interlaboratory comparison study addresses these issues by bringing together different TERS groups to perform TERS measurements on nominally identical samples...
We demonstrate broadband slow light through adiabatic nanofocusing of surface plasmon polaritons (SPPs) on a conical tip. A few femtosecond group delay for nanofocused pulses is found, corresponding to an SPP velocity of less than 0.2c at the apex of the tip.
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