Observation of ultrabroadband striped space-time surface plasmon polaritons
arXiv:2202.10504 · doi:10.1021/acsphotonics.2c00296
Abstract
Because surface plasmon polaritons (SPPs) are surface waves characterized by one free transverse dimension, the only monochromatic diffraction-free spatial profiles for SPPs are cosine and Airy waves. Pulsed SPP wave packets have been recently formulated that are propagation-invariant and localized in the in-plane dimensions by virtue of a tight spectral association between their spatial and temporal frequencies, which have thus been dubbed `space-time' (ST) SPPs. Because of the spatio-temporal spectral structure unique to ST-SPPs, the optimal launching strategy of such novel plasmonic field configurations remains an open question. We present here a critical step towards realizing ST-SPPs by reporting observations of ultrabroadband striped ST-SPPs. These are SPPs in which each wavelength travels at a prescribed angle with respect to the propagation axis to produce a periodic (striped) transverse spatial profile that is diffraction-free. We start with a free-space ST wave packet that is coupled to a ST-SPP at a gold-dielectric interface, and unambiguously identify the ST-SPP via an axial beating detected in two-photon fluorescence produced by the superposition of incident ST wave packet and the excited surface-bound ST-SPP. These results highlight a viable approach for efficient and reliable coupling to ST-SPPs, and thus represent the first crucial step towards realization of the full potential of ST-SPPs for plasmonic sensing and imaging.
arXiv comment9 pages, 8 figures
References in corpus (24)
- Ultrafast active plasmonics: transmission and control of femtosecond plasmon signals
- Ultrafast and energy-efficient all-optical switching with graphene-loaded deep-subwavelength plasmonic waveguides
- Generation and near-field imaging of Airy surface plasmons
- Plasmonic Airy Beam on Metal Surface
- Diffraction-free space-time beams
- Photons that travel in free space slower than the speed of light
- Classification of propagation-invariant space-time wave packets in free space: Theory and experiments
- Anomalous refraction of optical space-time wave packets
- Space-time wave packets localized in all dimensions
- Localized and stationary light wave modes in dispersive media
- What is the maximum differential group delay achievable by a space-time wave packet in free space?
- Accelerating and decelerating space-time optical wave packets in free space
- Ultrashort Tilted-Pulse-Front Pulses and Nonparaxial Tilted-Phase-Front Beams
- Gaussian beams diffracting in time
- Hybrid guided space-time optical modes in unpatterned films
- Broadband space-time wave packets propagating 70 m
- Spatiotemporal diffraction-free pulsed beams in free-space of the Airy and Bessel type
- Quantized conical waves in multimode optical fibers
- Arbitrarily accelerating space-time wave packets
- The consequences of non-differentiable angular dispersion in optics: Tilted pulse fronts versus space-time wave packets
- Isochronous space-time wave packets
- Localized waves carrying orbital angular momentum in optical fibers
- Spectrally recycling space-time wave packets
- Spatiotemporal control of surface plasmon polariton wave packets with nanocavities