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Nanovortex evolution in entrance part of the 2D open type long nanocavity

Kordos A., Kucaba-Piętal A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2018

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Vol. 66, nr 2

119--125

EN

Non-equilibrium molecular dynamics method (NEMD) is applied to investigate a formation process of water nanovortex in 7 nm wide nanocavity (aspect ratio of which was equal to 3.6). The flow in the nanocavity was induced by Poiseuille 2D water nanoflow in a main nanochannel, to which the nanocavity is situated perpendicularly. The wall of main channel and the nanocavity is made from quartz. Flow is induced by applying constant force to molecules inside the main channel. Based on NEMD simulation data, the sequence of images representing water velocity vector fields was obtained at constant time intervals equal to 1 ns, which shows vortex formation mechanism. Flow field images analysis indicates that the shape and centre position of the nanovortex vary slightly each nanosecond, nevertheless, the structure remains stable in the flow field at the entrance to the nanocavity.

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On a nanophotonic response descriptor

Anagnostakis E. A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2013

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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.

3

Plasmon polaritons in metal nanostructures : the optoelectronic route to nanotechnology

Salerno M., Krenn R. R., Lamprecht B., Schider G., Ditlbacher H., Felidj N., Leitner A., Aussenegg F. R.

Opto-Electronics Review

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2002

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Vol. 10, No. 3

217-224

EN

In the light of recent advances in subwavelength optics, the development of optical nanodevices is nowadays conceivable. Among the best candidates to act as the elementary components of such devices are nanoscale structures of noble metals. These materials are capable to sustain resonant electron oscillations (plasmons). This phenomenon gives rise to a spectrally selective optical response and a local field enhancement which can be used in the context of nano-optics. Furthermore, it allows to transduce the optical signals into electrical ones (and vice wersa). Here, we demonstrate an optical nanodevice based on plasmon resonances in gold nanostructures. The adequate metal structures were produced by electron-beam-lithography. The basic operating functions of the device, namely signal processing on the nanoscale and its interfacing on the microscale, were experimentally observed in the optical near-field by photon scanning tunneling microscopy. Furthermore, as a numerical method for validation of the near-field observations the Green's Dyadic Technique is pointed out.

4

Introduction to Nanotechnology for Acoustics (review article)

Surowiak Z.

Molecular and Quantum Acoustics

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2001

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Vol. 22

239-260

EN

Nanostructure science and technology is clearly a very broad and interdisciplinary area of research and development activity worldwide. It has been growing exlosively in the past few ears, since the realisation that creating new materials and devices from nanoscale building blocks could access nwe and improved properties nad functionalities. While many aspects of the field exicted well before nanostructure science and technology became a coherent field of endeavor through the confluence of three crucial technological treams:;(1) new and improved control of the size and manipulation of nanoscale building blocks; (2) new and impoved characterization (e.g., spatial resolution, chemical sensitivity) of materials at the nanoscale; (3) new and improved understanding of the relationships between nanostructure and properties and how these can be engineered.