By D. Menze
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Extra info for Electron and Photon Interactions at Intermediate Energies
It may also cause a significant radiative loss and prevent spasing for some modes. We would also like to point out that the fact that the unit cell of the negativerefracting (or double-negative) metamaterial of Reference 89 is relatively large, a ≈ 280 nm, is not accidental. As follows from theoretical consideration of Reference 91, optical magnetism and, consequently, negative refraction for metals, is only possible if the minimum scale of the conductor feature (the diameter d of the nanowire) is greater than the skin depth, d ls ≈ 25 nm, which allows one to circumvent Landau– Lifshitz’s limitation on the existence of optical magnetism [67, 91].
02 eV. 2. (a) Number Nn of plasmons per spasing mode as a function of the excitation rate g (per one chromophore of the gain medium). Computations are done for the dipole eigenmode with the spasing frequencies ωs as indicated, which were chosen by the corresponding adjustment of the nanoshell aspect ratio. (b) Population inversion n12 as a function of the pumping rate g. The color coding of the lines is the same as in panel (a). (c) The spectral width s of the spasing line (expressed as s in meV) as a function of the pumping rate g.
65) is created by a short pulse at t = 0 and simultaneously initial SP population Nn is created. 20). 5h. When the initial SP population exceeds the critical one of Nn = 1 (the blue, green, and red curves), the spaser responds with generating a short (duration less than 100 fs) pulse of the SP population (and the corresponding local fields) within a time 100 fs [panel (g)]. Simultaneously, the inversion is rapidly (within ∼ 100 fs) exhausted [panel (h)]. 5g. The corresponding inversion decays in this case almost exponentially with a characteristic time ∼ 1 ps determined by the enhanced energy transfer to the SP mode in the metal—see the corresponding curves in panel (h).