Buranasiri, Prathan

Loading...
Thumbnail Image
Preferred name
Buranasiri, Prathan
Alternative Name
Buranasiri, P.
Main Affiliation
Email
prathan.bu@kmitl.ac.th

Settings

Now showing 1 - 3 of 3
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Phase-matched second-harmonic generation in core-shell nanowire hyperbolic metamaterial
    (2022-09-01)
    Wicharn, Surawut
    ;
    Banerjee, Partha P.
    ;
    Buranasiri, Prathan
    Second-harmonic generation is well-known nonlinear frequency conversion technique, which can be applied in nonlinear optical characterization of materials and all-optical signal processing. This phenomenon requires phase-matching to maximize the conversion efficiency of generated second-harmonic field. But the phase-matching condition is difficult to achieve because of dispersion of naturally existing materials. To overcome this limitation, we propose an innovative phase-matching technique, which is called hyperbolic phase-matching, that can be possibly achieved by managing dispersion of a hyperbolic metamaterial. Here, the hyperbolic metamaterial is made of two-dimensional periodic arrays of core-shell nanowires, which have aluminium gallium arsenide as a core and gold as a shell, immersed in anodic aluminium oxide matrix. We have demonstrated phase-matched conditions for two different non-collinear second-harmonic interacting configurations in the metamaterial, which can be created by tuning incident angle of pump field to optimal values. Finally, conversion efficiencies of transmitted and reflected second-harmonic pulses as a function of incident angle and input pulse intensity were examined. The maximum conversion efficiencies are obtained at optimal incident angle and largest pumping intensity.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Single-beam holography using anisotropic self-diffraction
    (2006-11-13)
    Buranasiri, Prathan
    ;
    Banerjee, Partha P.
    We report a new kind of single incident beam holography. In this method, we use only one beam instead of two beams to make gratings inside photorefractive cerium doped barium titanate. The configuration of the method is based on an anisotropic self-diffraction scheme. The reflection of self-phase conjugate beam at the surface of incidence plays the role of the second beam. By using the reflection of the self-phase conjugate beam, the difficulty of alignment between two focused writing beams has been eliminated. The autocorrelation images in non-Bragg orders have been monitored in order to verify the effectiveness of this method for writing holograms.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Dispersion relations for negative index materials and slow light
    (2007-12-01)
    Banerjee, Partha P.
    ;
    Nehmetallah, Georges
    ;
    Aylo, Rola
    ;
    Buranasiri, Prathan
    In this work we theoretically model continuous and pulse wave propagation using the underlying dispersion relations. We also derive the dispersion relations of the underlying wave equations based on the real and imaginary parts of the propagation constant which are related through Hubert transformation to ensure causality. Also, in this paper we show that by using a model of photorefractive two wave coupling, we can derive the dispersion relation for pulsed propagation and coupling in a diffusion dominated photorefractive material. We note that the dispersion relation we have found in photorefractive material also obeys the Hubert transform property. Finally, we show that the group velocity of light can be slowed down by means of phase coupling in the photorefractive two-wave mixing process.