Buranasiri, Prathan

Preferred name

Buranasiri, Prathan

Alternative Name

Buranasiri, P.

Main Affiliation

School of Science

prathan.bu@kmitl.ac.th

Now showing 1 - 10 of 25

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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.
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Third-harmonic generation in tunable nonlinear hyperbolic metamaterial
(2018-01-01)
Wicharn, Surawut
;
Buranasiri, Prathan
In this research, a third-harmonic generation (THG) in a tunable nonlinear hyperbolic metamaterial (TNHM) has been investigated numerically. The TNHM is consisted of periodically arranging of multilayered graphene layers system for controlled optical properties purpose, and ordinary nonlinear dielectric layer. The possibility of TNHM permittivity dispersion controlled by number of graphene layers and external bias voltage to graphene layers was satisfied, then the structure has created the nearly perfect phase-matching scheme based on epsilon-near-zero (ENZ) behavior of the nonlinear medium. Finally, the optimal designed TNHM structure with sufficient bias voltage have given the forwardand backward-direction TH pulses, which the backward-forward TH intensity ratio is closely unity. The THG conversion efficiencies have been maximized after increasing the pumping level to 800 MW/cm2. From this study, the optimal designed TNHM can be applied as a bi-directional nonlinear frequency converters in nanophotonic systems.
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Recursive-formula for second-harmonic generation problem in photonic hypercrystal
(2022-09-01)
Buranasiri, Prathan
;
Plaipichit, Suwan
;
Puttharugsa, Chokchai
;
Wicharn, Surawut
In this work, we proposed a recursive-formula based on transfer-matrix method to solve problem of second-harmonic generation by obliquely incident fundamental-harmonic wave in a photonic hypercrystal, which is composed of one-dimensional periodically alternating arrangement of nonlinear hyperbolic metamaterial layer with anisotropic permittivities: ε<inf>axx</inf>, ε<inf>azz</inf> and layer thickness: a and linear dielectric layer with isotropic permittivity: ε<inf>a</inf> and layer thickness: b. This proposed formula was very simple and accurate for calculating conversion efficiency of second-harmonic generation at various incident angles of fundamental-harmonic wave and thicknesses of nonlinear hyperbolic metamaterial layer. The numerical results showed that the maximum conversion efficiency can be achieved by the strong local field confinement of fundamental-harmonic wave in the photonic hypercrystal and phase-matching due to optimal values of hypercrystal layer thickness and incident angle of fundamental-harmonic wave.
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Asymmetrical resonant cavity thin film devices designed for vanadium dioxide applications
(2025-01-01)
Padungatthakij, Chettanat
;
Wicharn, Surawut
;
Buranasiri, Prathan
Vanadium dioxide (VO2) is a volatile phase change material (PCM) that undergoes a rapid structure transition when heated above and reverts when cooled below its transition temperature. This transition alters its optical properties significantly when compared to normal materials, making it possible to design a thin film device with switching operation mode. In this paper, we redesign VO2-based devices with two different use cases to introduce an asymmetrical resonant cavity (AsymReca) structure. The redesigned process aimed to enhance the optical performance of the central VO2 layer and gave it an antireflection property. Using simulation, we discuss the advantages and limitations of this design approach and highlighting its potential use case.
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Phase-change metamaterial for tunable polarization conversions in terahertz region
(2024-01-01)
Wicharn, Surawut
;
Buranasiri, Prathan
In this study, a phase-change metamaterial (PCM) is proposed to be applied as tunable terahertz (THz) polarization converter. The structure of PCM consists of 4 layers such as hyperbolic medium (HM) layer, vanadium dioxide (VO2) layer, the polyimide (PI) layer, and gold (Au) gratings, respectively. The HM layer is made by two-dimensional arrangement of gold (Au) nanowires in x-y plane immerged in PI host slab. The polarization converting characteristics of PCM structure is investigated numerically by using anisotropic transfer-matrix method (ATMM). The numerical results show that, when the VO2 is in insulating state, the PCM structure provides transmitted cross-linear polarization conversion and when the VO2 is changed to conducting state, the PCM structure gives both reflective cross-linear polarization and linear-to-circular polarization conversions.
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Optical parametric amplification in one-dimensional photonic bandgap structures
(2013-09-01)
Wicharn, Surawut
;
Buranasiri, Prathan
;
Ruttanapun, Chesta
;
Jindajitawat, Phumin
In this paper, optical parametric amplification based on the degenerate four-wave mixing principle in a one-dimensional photonic bandgap (PBG) structure has been numerically studied. First, the multiple scale method was introduced to derive a complete set of nonlinear coupled-mode equations for a finite structure with different inhomogeneous nonlinear coefficients than those used in previous works. This finite structure is composed of 680 dielectric layers, which are alternating half-wave/eight-wave films. The wavelengths of the pump, signal, and idler pulses have been determined from the transmission spectrum, which was illustrated by using the transfer matrix method. The parametric interaction of the pump, signal, and idler pulses inside PBG structure has been numerically simulated by using the splitstep Fourier transform method. The results of the simulation have shown that the intensities of the signal and idler have exponential growth with respect to the number of layers in the medium. Meanwhile, pump wavevector detuning directly affects the intensities of both pulses due to a band-edge phase-matching condition that might be achieved from only one optimal detuning parameter. Moreover, both the amplification gain and the conversion efficiency of the idler pulse have been shown to be dependent on the bandwidth of the pump pulse spectrum. A very narrow pulse, with a bandwidth much less than the relevant transmission peak, enables the highest amplification and conversion efficiency in this medium because the most efficient phase-matched condition occurs in this situation. Finally, the conversion efficiency grows exponentially with input pump intensity for several input signal intensities. Furthermore, the maximum conversion efficiencies directly vary with input signal intensity. © 2013 Optical Society of America.
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Band-edge field enhanced nonlinear cross-polarized wave generation in photonic bandgap structure
(2019-04-15)
Wicharn, Surawut
;
Buranasiri, Prathan
We report on the enhancement of nonlinear cross-polarized wave (XPW) generation in a one-dimensional photonic band-gap structure, which is composed of two periodic arrangements of barium-fluoride and silicon-dioxide through numerical simulations. By detuning the pump-field wavelength to the band-edge position of the photonic band-gap spectrum, the electric field at this wavelength would be resonant and then the field enhancement mechanism arises immediately. Under band-edge field enhancement condition, we found that the conversion efficiencies of XPW generation was implicitly enhanced even without phase-matched condition from the exact angle of crystallographic axis orientation.
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Third-harmonic pulse generation in one-dimensional photonic crystal structures
(2014-01-01)
Wicharn, Surawut
;
Buranasiri, Prathan
Enhanced third-harmonic generation in a one-dimensional photonic crystal doped with third-order nonlinear medium was numerically investigated using the multiple-scale method and the split-step Fourier transform. The optimal fundamental frequency for third-harmonic wave generation was determined from the transmission spectrum. The third-harmonic pulse intensities grow, depending on the structure thickness and the fundamental-frequency detuning parameter, which determines the band-edge phase matching condition. Furthermore, the total energy output of third-harmonic pulses, depending on the fundamental-frequency pulse width, may be more than 1000 times the energy produced by a phase-matched bulk medium. A narrow pulse with bandwidth less than the band-edge transmission peak enables high conversion efficiency. The maximum conversion efficiency of the forward component may be 12 to 13 orders of magnitude greater than that of the backward component. © Society of Photo-Optical Instrumentation Engineers.
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A numerical investigation of difference frequency generation in nonlinear multilayered metamaterials
(2017-01-01)
Buranasiri, Prathan
;
Nuansri, Rittirong
;
Wicharn, Surawut
In this paper, a second-order nonlinear interaction, difference-frequency generation, based on three-wave mixing process in nonlinear multilayered metmaterial has been investigated numerically. The nonlinear multilayered metmaterial is composed of two periodically alternating metallic and dielectric layers, which their layer thicknesses are reduced into deep-subwavelength size for creating some nonlinear optical effect enhancement mechanism. The optimal engineered structure gives a dispersion relation having near zero permittivity at some frequencies and can be called epsilon-nearzero point. When a pump frequency (ω1) is determined at this point, the epsilon-near-zero phase matched condition and field intensity enhancement are easily achieved and then a strong idler wave at difference-frequency ω3 = ω1 â' ω2, corresponding to DFG effect can be generated efficiently. According to this parametric interaction, the nonlinear multilayered metamaterial can be applied as nonlinear frequency converters in various nanophotonic systems.
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Resonant enhanced third-harmonic generation in a photonic hyper-crystal
(2020-10-13)
Buranasiri, Prathan
;
Wicharn, Surawut
We numerically demonstrated an efficient third-harmonic generation (THG) in photonic hypercrystal. We found that the highest THG conversion efficiencies is obtained due to strong localized field of surface wave and light confinement from Bragg reflection.

Buranasiri, Prathan

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