Research progress of femtosecond surface plasmon polariton*

Abstract

As the combination of surface plasmon polariton and femtosecond laser pulse, femtosecond surface plasmon polariton has both nanoscale spatial resolution and femtosecond temporal resolution, and thus provides promising methods for light field manipulation and light–matter interaction in extreme small spatiotemporal scales. Nowadays, the research on femtosecond surface plasmon polariton is mainly concentrated on two aspects: one is investigation and characterization of excitation, propagation, and dispersion properties of femtosecond surface plasmon polariton in different structures or materials; the other one is developing new applications based on its unique properties in the fields of nonlinear enhancement, pulse shaping, spatiotemporal super-resolved imaging, and others. Here, we introduce the research progress of properties and applications of femtosecond surface plasmon polariton, and prospect its future research trends. With the further development of femtosecond surface plasmon polariton research, it will have a profound impact on nano-optoelectronics, molecular dynamics, biomedicine and other fields.

Clinical Observation on 80 Cases of Anal Edema after Mixed Hemorrhoids Operation with Chinese Medicine Hot Election Package

“…Modern pharmacological studies have found that gypsum has a strong and rapid antipyretic effect, and it is also effective in regulating the metabolic disorders of trace elements caused by pathological changes and enhancing the bactericidal immunity of the body [12]. Yang Liu et al found that gypsum can achieve antipyretic and anti-inflammatory effects by regulating PGE2 content [13]. The above three kinds of traditional Chinese medicine are combined in reasonable doses to promote blood circulation and remove blood stasis, reduce swelling and relieve pain, and have the effects of anti-inflammatory and sterilization.…”

Plasmonic tweezers: for nanoscale optical trapping and beyond

“…A new underlying physical mechanism of nonlinear trapping has recently been reported [346][347][348][349][350][351] , which offers an alternative approach for exploring the physical mechanisms of light-matter interactions 28 . When a femtosecond optical pulse is incident on a metal surface, it might disturb the equilibrium in the energy-momentum distribution of electrons and thereby influence plasmonic excitation and propagation along the surface [352][353][354] . Furthermore, harmonic spin-orbit angular momentum coupling and its a b Fig.…”

Two-dimensional spatiotemporal Fourier transform with femtosecond pulses for on-chip devices

“…where k SPP (ω) =2π/λ SPP (ω) denotes the wave vector of SPP, with λ SPP (ω) the wavelength of the SPP 12 ,…”

“…To demonstrate this 2-D spatiotemporal FT method for on-chip devices, we chose surface plasmon polaritons (SPP) excited on a metal surface as carriers of on-chip optical signals, and studied modulation effects of femtosecond SPP pulses. With their capability of breaking through the optical diffraction limit 12 , SPPs are widely employed in nanophotonic devices used in a variety of applications including optical storage 13 , optical sensing 14 , optical tweezers 15 , and Raman scattering 16 . In addition to nanoscale spatial resolutions, SPP pulses generated by a femtosecond laser beam enable femtosecond-scale temporal resolutions, thereby providing a research platform to investigate the manipulation of light fields and the interaction of light and matter at extremely small spatiotemporal scales.…”

“…where k SPP (ω) =2π/λ SPP (ω) denotes the wave vector of SPP, with λ SPP (ω) the wavelength of the SPP 12 , and ω the frequency of the incident light. Regardless of the time-dependent term, when the focal length R of the reference arc is much larger than the SPP wavelength λ SPP (ω), then, using the 2-D Helmholtz-Kirchhoff integral theorem 22,23 , the time-averaged spatial distribution of the SPP in the focal region is approximately 4,24 After the SPP focusing structure is illuminated by the incident pulse of light, the electric field is…”