Wyniki wyszukiwania - Biblioteka Nauki

1

Wavefunction-Engineering of Intersubband THz-Laser Nanoheterointerfaces

100%

Anagnostakis E.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2011

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tom Vol. 15, No 1

85-90

EN

A novel THz-luminescence laser nanoheterointerfacial scheme of the intersubband, longer-wavelength limit, mid-infrared functionality type has been designed on the basis of optically-pumped dual-resonant tunnelling of conductivity electrons within an appropriately energetically-determined configuration of five subbands hosted by two communicating asymmetric, approximately rectangular quantum wells (QWs). The employed upper laser-action level is the second excited subband of the nanostructure back, wider QW and is provided with electrons via resonant tunnelling from the first excited subband of the nanostructure front QW populated through remotely ignited optical pumping out of the local fundamental subband. On the other hand, the first excited back-QW subband functions as the lower laser action level, directly delivering the received electrons to the local fundamental subband via a fast vertical longitudinal optical phonon scattering. From there, they are recycled back to the nanostructure front QW fundamental subband by virtue of a second, reverse sense resonant-tunnelling-mediated normal charge transport mechanism. A nanophotonics application of the scheme predicts laser operability in the 15-THz range.

2

Sensitivity of imaging properties of metal-dielectric layered flat lens to fabrication inaccuracies

88%

Kotyński R. , Baghdasaryan H. , Stefaniuk T. , Pastuszczak A. , Marciniak M. , Lavrinenko A. , Panajotov K. , Szoplik T.

Opto-Electronics Review

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2010

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tom Vol. 18, No. 4

446-457

EN

We characterize the sensitivity of imaging properties of a layered silver-TiO₂ flat lens to fabrication inaccuracies. The lens is designed for approximately diffraction-free imaging with subwavelength resolution at distances in the order of a wavelength. Its operation may be attributed to self-collimation with a secondary role of Fabry-Perot resonant transmission, even though the first order effective medium description of the structure is inaccurate. Super-resolution is maintained for a broad range of overall thicknesses and the total thickness of the multilayer is limited by absorption. The tolerance analysis indicates that the resolution and transmission efficiency are highly sensitive to small changes of layer thicknesses.

3

On negative differential mobility in nanophotonic device functionality

88%

Anagnostakis E. A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2013

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tom Vol. 17, No 3-4

131--137

EN

The negative differential mobility (NDM) of two-dimensional carrier-gas against some proper external regulator allowing gradual controlled modification of the nanointerfacial environment tends to occur as interwoven with the nanophotonic device functionality. In this work, several instances from our two-decade principal research of both experimental observation and conceptual prediction concerning nanophotonics NDM are reconsidered towards outlining a global potential for the appearance of the effect.

4

On a nanophotonic response descriptor

75%

Anagnostakis E. A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2013

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tom Vol.17, No 1-2

91--94

EN

The photonic response exhibited by typical semiconductor nanodevices is modeled through a notionally universal descriptor by virtue of the Green’s function associated with the generic complete, inhomogeneous differential equation. It is derived that the photoresponse evolution is expressible as the sum of saturation-limiting linear nanophotonic behavior and a linear superposition of eigenfunctions of the respective homogeneous Fredholm integral equation.

5

Plasmonic abilities of gold and silver spherical nanoantennas in terms of size dependent multipolar resonance frequencies and plasmon damping rates

63%

Kolwas K. , Derkachova A.

Opto-Electronics Review

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2010

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tom Vol. 18, No. 4

429-437

EN

Absorbing and emitting optical properties of a spherical plasmonic nanoantenna are described in terms of the size dependent resonance frequencies and damping rates of the multipolar surface plasmons (SP). We provide the plasmon size characteristics for gold and silver spherical particles up to the large size retardation regime where the plasmon radiative damping is significant. We underline the role of the radiation damping in comparison with the energy dissipation damping in formation of receiving and transmitting properties of a plasmonic particle. The size dependence of both: the multipolar SP resonance frequencies and corresponding damping rates can be a convenient tool in tailoring the characteristics of plasmonic nanoantennas for given application. Such characteristics enable to control an operation frequency of a plasmonic nanoantenna and to change the operation range from the spectrally broad to spectrally narrow and vice versa. It is also possible to switch between particle receiving (enhanced absorption) and emitting (enhanced scattering) abilities. Changing the polarization geometry of observation it is possible to effectively separate the dipole and the quadrupole plasmon radiation from all the non-plasmonic contributions to the scattered light.