Diffraction-limited laser excitation of a surface plasma wave and its scattering on a rippled metallic surface

Liu, C.S.; Tripathi, V. K.

doi:10.1109/3.704351

Cited by 41 publications

(13 citation statements)

References 11 publications

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“…Since l opt is 28.3 nm for the 405 nm laser, which is 17 % of the thickness of the pristine Ag NP thin film and the estimated thermal conductivity of Ag NP ink is around 0.1-0.17 W/ (m K), laser light energy is efficiently absorbed on the surface of the Ag NP thin film and most of the energy is dissipated by transverse and vertical heat conduction. Flake-like ripples are noticed on the sintered Ag NP surface at higher power where surface melting occurs [43,44]. Figure 5 shows high-magnification SEM images of the Ag NP thin film irradiated with green laser at different laser powers (10,20,40,80 and 100 mW) and scanning speeds.…”

Section: Surface Morphologies and Electrical Propertiesmentioning

confidence: 95%

Laser wavelength effect on laser-induced photo-thermal sintering of silver nanoparticles

et al. 2015

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This work is concerned with the laser wavelength effect on the electrical properties and surface morphology of laser-sintered nanoparticle thin films. Silver nanoparticle thin films spin-coated on soda lime glass substrates were irradiated with lasers of three different wavelengths (near ultraviolet 405 nm, green 514.5 nm, near infrared 817 nm) at varied laser intensities and scanning speeds. Scanning electron microscopy images and ex situ resistivity measurements show that the photo-thermal sintering alters significantly the film surface morphology and electrical properties, depending on the processing parameters (laser wavelength, laser intensities and scanning speed). While the optical response of the material is determined largely by the processing laser wavelength, the laser beam intensity and scanning speed regulate the induced temperature field. Examination of the optical properties of as-deposited silver nanoparticle thin film in conjunction with scanning electron microscopy images taken from the laser-sintered lines helps elucidate how the processing laser wavelength modulates the optical response of silver nanoparticle thin film and therefore affects the thermal response.

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Section: Surface Morphologies and Electrical Propertiesmentioning

confidence: 95%

Laser wavelength effect on laser-induced photo-thermal sintering of silver nanoparticles

et al. 2015

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“…For a SPW propagating along the boundary of the vacuum-metal interface ͑say z-axis͒, the dispersion relation gives k z 2 = ͑ 0 2 / c 2 ͒⑀ / ͑1+⑀͒, where k z is the wave vector of the SPW and ⑀ is the dielectric constant of the metal ͑which is negative͒. 7,8 It can be immediately seen that the wave vector k z of the SPW is bigger than the wave vector of the electromagnetic wave in a vacuum. The k mismatch can be overcome either by using the attenuated total reflection ͑ATR͒ configuration or by creating a surface ripple of desired wave vector.…”

Section: Introductionmentioning

confidence: 98%

Parametric excitation of surface plasma waves in an overdense plasma irradiated by an ultrashort laser pulse

Kumar

Tripathi

2007

Physics of Plasmas

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A high power laser, obliquely incident on a vacuum-plasma interface, (x=0), resonantly drives plasma oscillations at the second harmonic when 2ω0=ωp, where ωp is the plasma frequency and ω0 is the frequency of the laser. The plasma oscillations parametrically excite a pair of counterpropagating surface plasma waves (ω,kz) and (ω1,k1z) when ω=ω1−2ω0, kz=k1z−2k0z, where k0z is the component of the incident laser wave vector parallel to the interface. The growth rate is maximum for normal incidence of the laser and decreases with the angle of incidence. In a mildly relativistic case, the relativistic mass variation of plasma electrons and collisions detune the second harmonic resonance, lowering the growth rate.

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“…[1][2][3][4][5][6][7] These waves play a crucial role in laser ablation, 8 high sensitivity sensors, 9 and are being explored for their potential in subwavelength optics, magneto-optic data storage, microscopy, and solar cells. [10][11][12][13] The problem of transferring energy from a beam of particles into electromagnetic wave energy has been given considerable attention in various fields of physics.…”

Section: Introductionmentioning

confidence: 99%

Effect of beam premodulation on excitation of surface plasma waves in a magnetized plasma

2010

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A density modulated electron beam propagating through a vacuum magnetized plasma interface drives electromagnetic surface plasma waves (SPWs) to instability via Cerenkov and fast cyclotron interaction. Numerical calculations of the growth rate and unstable mode frequencies have been carried out for the typical parameters of the SPWs. The growth rate γ of the unstable wave instability increases with the modulation index (Δ) and is maximized for Δ=1. For Δ=0, γ turns out to be ∼4.32×1010 rad/s for Cerenkov interaction and ∼6.81×1010 rad/s for fast cyclotron interaction. The growth rate of the instability increases with the beam density and scales as one-third power of the beam density in Cerenkov interaction and is proportional to the square root of beam density in fast cyclotron interaction. In addition, the real frequency of the unstable wave increases with the beam-energy and scales as almost one-half power of the beam-energy.

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Diffraction-limited laser excitation of a surface plasma wave and its scattering on a rippled metallic surface

Cited by 41 publications

References 11 publications

Laser wavelength effect on laser-induced photo-thermal sintering of silver nanoparticles

Laser wavelength effect on laser-induced photo-thermal sintering of silver nanoparticles

Parametric excitation of surface plasma waves in an overdense plasma irradiated by an ultrashort laser pulse

Effect of beam premodulation on excitation of surface plasma waves in a magnetized plasma

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