Anomalous absorption of p-polarised laser on metallic surface ingrained with noble-metal nanotubes in the presence of external magnetic field

Simon, Moses; Chauhan, Prashant

doi:10.1007/s11082-023-05088-x

Cited by 9 publications

(2 citation statements)

References 58 publications

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“…For numerical analysis, solid state lasers were used with ω 1 = 20.55 × 10 14 rad s −1 and ω 2 = 20.15 × 10 14 rad s −1 , such that their frequency difference lies in the THz region. The host medium under consideration is argon gas, (ε h = 1) [48] whereas the NPs are made of the noblemetal gold (ε m = 9) [49,50]. The intensity of the incident laser beam is I = 8 × 10 18 Wm −2 , which corresponds to an electric field strength of E o = 7.1 × 10 10 Vm − 1 and beam width of the laser was a o = 50 µm.…”

Section: Resultsmentioning

confidence: 99%

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

Simon,

Chauhan

2024

J. Opt.

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This communication deals with the analytical study of terahertz (THz) generation via frequency-difference mechanism using two circularly symmetric Gaussian laser beams with slightly different frequencies ω1 and ω2 and wave vectors k1 and k2 simultaneously propagating through a mixture of spatially corrugated noble-metal nanoparticles. The mixture, consisting of spherical and cylindrical nanoparticles, is placed in a host medium under the influence of an externally applied static magnetic field. The two co-propagating laser beams impart a nonlinear ponderomotive force on electrons of the nanoparticles, causing them to experience nonlinear oscillatory velocity. Further, the consequent nonlinear current density excites terahertz radiation at the beat frequency (=ω1 - ω2). Magnetic field inﬂuences the surface plasmon resonance condition associated with electrons of the nanoparticles due to enhancement in ponderomotive nonlinearities, thereby causing an increment in the amplitude of generated THz field. It is observed that the generated THz radiation has a strong dependence on the shape and size of the nanoparticles in addition to the magnetic field strength. Cylindrical nanoparticles provide greater THz amplitude than spherical nanoparticles due to additional resonance modes, and combining both kinds of nanostructures further enhance the amplitude. THz radiations play an important role in biomedical and pharmaceutical fields, communications, security and THz spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

Simon,

Chauhan

2024

J. Opt.

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“…In terms of the method, it facilitates quantitative detection of the external magnetic field [16]. Evidence has demonstrated that external magnetic fields can amplify absorption by inducing surface plasmon resonance in nanostructures through electron excitation [17]. Moreover, the presence of a magnetic field can exert an influence on the polarization properties of the probe field [18].…”

Section: Introductionmentioning

confidence: 99%

The Four Wave Mixing (FWM) in a five-level atomic system driven by magnetic field

Wang,

Qu,

Zhang

2023

Preprint

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We present a scheme to demonstrate the manipulation of spatially dependent four-wave mixing (FWM) in a five-level atomic system which driven by external magnetic field. One can obtain the FWM field that transferred from the vortex pump field carrying orbital angular momentum(OAM), and the enhancement of FWM conversion efficiency can be achieved by increasing the intensity of the vortex pump or adjusting the control field, while the FWM phase twists in different trend under the two situations. As the response to the external magnetic field, the peak conversion efficiency of FMW is attainted at the symmetrical points, where FWM phase twist direction changes symmetrically with the magnetic field. This finding holds potential applications in magnetic detection and contributes to a deep understanding of nonlinear phenomenon in the atomic system.

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Nonlinear absorption of Hermite cosh-Gaussian laser beam in an assembly of cylindrical carbon nanotubes embedded with static magnetic field

Ali,

Kumar,

Mishra

et al. 2024

Opt Quant Electron

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Anomalous absorption of p-polarised laser on metallic surface ingrained with noble-metal nanotubes in the presence of external magnetic field

Cited by 9 publications

References 58 publications

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

Magnetic field enhanced terahertz generation from shape-dependent metallic nanoparticles

The Four Wave Mixing (FWM) in a five-level atomic system driven by magnetic field

Nonlinear absorption of Hermite cosh-Gaussian laser beam in an assembly of cylindrical carbon nanotubes embedded with static magnetic field

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