Contents

Section 1. Topics on theoretical electrodynamics

NARROWING THE LINEWIDTH OF A PLASMONIC NANOLASER WITH AN INCREASE OF COUPLING BETWEEN A TWO-LEVEL SYSTEM AND A PLASMONIC NANOPARTICLE
Andrianov E. S., Pukhov A. A., Vinogradov A. P., Dorofeenko A. V.

Abstract 

The emission of a plasmonic nanolaser built from a quantized open resonator and atom is studied in the strong quantum regime when the number of excited levels in the resonator is of the order of unity. Due to the comparable size of the atom and resonator we should consider the Purcell factor for both the atom and the resonator. It is shown that the coupling of the open nanoresonator with an atom may decrease the rate of nanolaser radiation and therefore cause narrowing of the resonator linewidth.

Keywords: nanolaser, two-level system, plasmonic nanoparticle, open cavity, Purcell factor

NANOPARTICLES MANIPULATION BY THE NEAR FIELD OF SURFACE WAVE

Puzko R. S.

Abstract 

The manipulation of nanoparticles by near-field of surface wave in all-dielectric system is studied. The optical trapping of nanoparticles significantly smaller than the wavelength is studied in detail. In particular, the effect of self-induced back-action is demonstrated.

Keywords: optical tweezers, surface wace, photonic crystall

Section 2. Topics on computer simulation in electrodynamics

ESTIMATION OF INTENSITY OF SCATTERING FROM NARROW HOLLOW SLOTS WITH ACCOUNTING FOR THE EXTERNAL REGION ADMITTANCE

Baskov К. М., Krasnolobov I. I., Lebedev А. M., Semenenko V. N., Furmanova T. A. 

Abstract 

An analytical expression was obtained for the admittance of the external region adjacent to the entrance of the slot. Using this result, analytical expressions were obtained for the intensity of two-position and backward scattering from the hollow, straight slots, which are narrow in comparison with the wavelength and in the form of grooves or through-thickness gaps in a locally plane surface of a metal object. Accounting for the admittance of the external region resulted in high accuracy of scattering field calculation, including in the vicinity of the minima and maxima of intensity of scattering from the groove. Based on analytical formulas for the scattering intensity, the evaluation expressions for the minimum and maximum values of the grooves’ radar cross section were obtained. It was shown that in the vicinity of minimum the radar cross section of narrow grooves strongly depends on the frequency, as well as on the width and depth of the groove, the explicit expression of this dependence was revealed. On the contrary, the maxima of the narrow grooves’ radar cross section, achieved at resonances of a standing wave inside the groove, was estimated as a single value 16/π ≈ 5 sm per meter of length and in a first approximation it does not depend on the frequency, width and depth of the groove. The obtained expressions were verified by comparing the results of calculations of backscattering diagrams of slots using the method of surface integral equations and using the expressions obtained in this work.

Keywords: slot, groove, through-thickness gap, radar cross section, admittance, single-mode approximation

Section 3. Metodological notes

COMMENTS TO AND TRANSLATION INTO RUSSIAN OF PURCELL'S ARTICLE "SPONTANEOUS EMISSION PROBABILITIES AT RADIO FREQUENCIES" // PHYSICAL REVIEW, 69, 681, (1946)

Vinogradov A. P. , Pukhov A. A.

Abstract 

Since the article is written very briefly and without any references, to make it easier for the reader to understand the article, the translation is accompanied by an explanation of the formulas used. In particular, it explains why the Purcell factor is proportional to the local density of states. Attention is also drawn to the change in the directivity pattern of spontaneous radiation for an atom located inside the resonator.

Keywords: Purcell factor, local density of states, directivity pattern, amplified spontaneous emission

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