UHF excitation of helium-neon lasers. II. Comparison with DC

Andrews, David; King, Terence A.

doi:10.1088/0022-3727/22/9/011

Cited by 9 publications

(10 citation statements)

References 12 publications

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“…Quantum electrodynamics can be used to calculate the full interaction Hamiltonian between the dipole LSPR field and the dipole distribution in the semiconductor to determine if a radiative contribution is also present. A full quantum electrodynamics (QED) theory for the interaction of two dipoles by the electromagnetic field can be summarized in terms of the total transition rate, which is composed of a RET transition rate, a far-field correction rate, and a radiative decay rate: w total = w RET + w int + w radiative where w RET = 9 κ 2 c 4 8 π τ A * n 4 r 6 ∫ F normalA ( ω ) σ normalB ( ω ) d ω ω 4 w int = 9 c 4 8 π τ A * n 2 r 4 false( κ 3 2 − κ …”

Section: Resultsmentioning

confidence: 99%

“…In the near field, the full QED treatment is identical to the expression derived using Fermi's golden rule and the dipole−dipole interaction Hamiltonian for RET. 54 No other near field terms arise from the calculation, so the plasmon mediated interaction mechanism must be the nonradiative RET and not a radiative term proportional to |E LSPR /E 0 | 2 . This is in agreement with the transient-absorption and photocatalysis measurements.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Photocatalytic Activity Enhanced by Plasmonic Resonant Energy Transfer from Metal to Semiconductor

et al. 2012

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Plasmonic metal nanostructures have been incorporated into semiconductors to enhance the solar-light harvesting and the energy-conversion efficiency. So far the mechanism of energy transfer from the plasmonic metal to semiconductors remains unclear. Herein the underlying plasmonic energy-transfer mechanism is unambiguously determined in Au@SiO(2)@Cu(2)O sandwich nanostructures by transient-absorption and photocatalysis action spectrum measurement. The gold core converts the energy of incident photons into localized surface plasmon resonance oscillations and transfers the plasmonic energy to the Cu(2)O semiconductor shell via resonant energy transfer (RET). RET generates electron-hole pairs in the semiconductor by the dipole-dipole interaction between the plasmonic metal (donor) and semiconductor (acceptor), which greatly enhances the visible-light photocatalytic activity as compared to the semiconductor alone. RET from a plasmonic metal to a semiconductor is a viable and efficient mechanism that can be used to guide the design of photocatalysts, photovoltaics, and other optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Photocatalytic Activity Enhanced by Plasmonic Resonant Energy Transfer from Metal to Semiconductor

et al. 2012

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“…In literature the study on RF discharge systems have demonstrated that the efficiency of this supply method is better than the DC one [15]. However, the results obtained in this work show that the transversal optical gain of a RF He-Ne plasma discharge has the same shape of that generated by means of a DC discharge.…”

Section: Discussionmentioning

confidence: 59%

“…In view of this, this work aims to study the optical gain of the line at 633 nm in a Radio-Frequency (RF) excited He-Ne plasma gas in function of both the radial behavior along the discharge bore and the total filling gas pressure. The studies about this topic date back to several years ago [11,12,13,14,15,16]. During years for commercial devices, the DC supply has been preferred over the RF one.…”

Section: Introductionmentioning

confidence: 99%

Radial distribution gain at 633 nm in a He-Ne RF-excited small bore discharge

Giacomelli,

Beverini,

Di Virgilio

et al. 2021

Preprint

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Devices as Large Ring Laser Gyroscopes (RLG) for fundamental physics and geophysics investigation are currently run by means of RF power supply systems. This is not the standard method to supply a gas laser, that typically is powered with a DC system. In literature RF power supply lasers have been studied several years ago, and to correctly understand the behaviour of devices as RLG a more detailed study has been pursued. Detailed study of the radial distribution of the optical gain of an He-Ne discharge cell in function of gas pressure and RF power supply will be illustrated, discussed and compared with existing literature. The presented analysis demonstrates that it is possible to optimize the RLG operation with a proper choice of gas pressure and power level of the RF power supply. Accordingly we have been able to establish transversal and longitudinal single-mode operation our prototype GP2.

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“…[9,10] investigated the influence of electron energy distribution on laser performance under rf excitation in the range 200-2000 MHz. An enhancement in optimum gain of 20-30% over dc excitation for a He-Ne laser has been verified in an experimental study.…”

Section: Introductionmentioning

confidence: 99%