Browsing Physics by Author "Hewageegana, P."

Now showing items 1-16 of 16

Absolute phase effect in ultrafast optical responses of metal nanostructures

Stockman, M.I.; Hewageegana, P. (APPLIED PHYSICS A: MATERIALS SCIENCE & PROCESSING, 2007)

We predict that nonlinear ultrafast electron photoemission by strong optical fields and, potentially, other nonlinear optical responses of metal nanostructures significantly depend on the absolute (carrier?envelope) phase ...
Circularly-polarized-pulse-driven ultrafast optical currents in monolayer hexagonal Boron Nitride (h-BN)

Hewageegana, P.; Apalkov, V. (Solid State Communications, 2022)

We predict the fundamentally fastest, ultrafast optical currents in monolayer hexagonal Boron Nitride (h-BN) by a circularly-polarized single-oscillation optical pulse. The femtosecond currents in gapped graphene and ...
Circularly-polarized-pulse-driven ultrafast optical currents in monolayer hexagonal Boron Nitride (h-BN)

Hewageegana, P.; Apalkov, V. (Solid State Communications, 2022)

We predict the fundamentally fastest, ultrafast optical currents in monolayer hexagonal Boron Nitride (h-BN) by a circularly-polarized single-oscillation optical pulse. The femtosecond currents in gapped graphene and ...
Electron localization in graphene quantum dots

Hewageegana, P.; Apalkov, V. (Physical Review B, 2008)

We study theoretically a localized state of an electron in a graphene quantum dot with a sharp boundary. Due to Klein?s tunneling, the ?relativistic? electron in graphene cannot be localized by any confinement potential. ...
Enhanced mid-infrared transmission through a metallic diffraction grating

Hewageegana, P.; Apalkov, V. (Journal of Physics: Condensed Matter, 2008)

We study theoretically an enhancement of the intensity of mid-infrared light transmitted through a metallic diffraction grating. We show that for s-polarized light the enhancement of the transmitted light is much stronger ...
Graphene Quantum Dots

Hewageegana, P.; Apalkov, V. (2010)
Investigation of temperature and density profile of brine in evaporating salt pans at Palavi in north-western Sri Lanka

Hewageegana, P.; Amarasekara, C.D.; Jayakody, J.R.P.; Punyasena, M.A. (2001)

Measurements of temperature and density variations with depth in salt pans having a stable salinity gradient are presented. The density variation of brine has been correlated to the temperature variation with depth. The ...
Nanolocalized Nonlinear Electron Photoemission under Coherent Control

Stockman, M.I.; Hewageegana, P. (Nano Letters, 2005)

We theoretically show that two-photon coherent control yields electron photoemission from metal nanostructures that is localized in nanosize hot spots whose positions are controllable on a nanometer scale, in agreement ...
Plasmonic enhancing nanoantennas for photodetection

Hewageegana, P.; Stockman, M.I. (Infrared Physics & Technology, 2007)

This paper discusses the use of plasmonic nanostructured systems as nanoantennas for photodetection. Even though semiconductors and their heterostructures have many useful properties and widely used in photodetection, their ...
A quantum dot in topological insulator nanofilm

Herath, T.M.; Hewageegana, P.; Apalkov, V. (2014)
Quantum dot photodetectors with metallic diffraction grating: Surface plasmons and strong absorption enhancement

Hewageegana, P.; Apalkov, V. (Physica E: Low-dimensional Systems and Nanostructures, 2008)

We report our theoretical study of the effect of metallic diffraction grating on the sensitivity of quantum dot photodetectors in terahertz frequency. We have found that the effect of diffraction grating is much stronger ...
Research in Buddhism and Physics

Galmangoda, Sumanapala; Hewageegana, P. (Research in Buddhism and Physics, )

Theory of Perception According to Buddhism everything in the world is impermanent. Everything is momentary. But there is a difference of life-span of mind and matter. The life-span of consciousness is termed as mind-moment ...
Second harmonic generation in disordered media: Random resonators

Hewageegana, P.; Apalkov, V. (Physical Review B, 2008)

We theoretically study the effect of random resonators on the conversion efficiency of fundamental mode propagating through disordered nonlinear dielectric film. Only resonators with double-resonant properties, i.e., which ...
Theoretical study of terahertz quantum well photodetectors: Effect of metallic diffraction coating

Hewageegana, P.; Apalkov, V. (Infrared Physics & Technology, 2008)

The possibility of enhancement of sensitivity of quantum well photodetectors by adding metallic diffraction coating on top of the dielectric layer of photodetectors is studied. With the grating the spatial distribution of ...
Trapping of an electron in coupled quantum dots in graphene

Hewageegana, P.; Apalkov, V. (Physical Review B, 2009)

Due to Klein?s tunneling the electronic states of a quantum dot in graphene have finite widths and an electron in quantum dot has a finite trapping time. This property introduces a special type of interdot coupling in a ...
Vismitha Nano Thakshanaya (??????? ???? ???????)

Hewageegana, P. (2012)

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Browsing Physics by Author "Hewageegana, P."

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