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 39

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P-Type optoelectronic and transparent conducting oxide properties of delafossite CuAl1/2Fe1/2O2
(2015-12-03)
Ruttanapun, Chesta
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Jindajitawat, Phumin
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Buranasiri, Prathan
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Harnwunggmoung, Adul
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Charoenphakdee, Anek
CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> delafossite was prepared using a solid-state reaction method to investigate its optical and electronic transport properties. CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> formed a hexagonal delafossite structure with an R3¯m space group. The positive Seebeck coefficient and the direct optical gap of 3.6 eV confirmed that the CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> delafossite in a p-type transparent conducting oxide. The fluorescence emission at 390 nm (green emission) confirmed that CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> has a direct transition band gap. Thermogravimetric analysis indicated a weight loss of 1.2%, caused by the intercalation of O atoms, which produced hole carriers from the different ionic radii at the B sites. The electric conductivity at room temperature was thermally activated, as predicted by the small-polaron hopping mechanism, with an activation energy of 75 meV and a charge transport energy of 61 meV. CuAl<inf>1/2</inf>Fe<inf>1/2</inf>O<inf>2</inf> delafossite exhibited p-type optoelectronic behavior and is a transparent conducting oxide, which may be crucial in the p-type photonic and electrode industries.
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NiO thickness measurement using a rectangular-type Sagnac interferometer as the material transport layer in a perovskite solar cell
(2024-04-10)
Usman, Abdullahi
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Bhatranand, Apichai
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Jiraraksopakun, Yuttapong
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Muhammad, Khalid Sabo
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Buranasiri, Prathan
This work aims to utilize a phase-shifting technique in a rectangular-type Sagnac interferometer (RTSI) to measure the thickness of a thin film of nickel (II) oxide (NiO) in an electron transport layer (ETL) in perovskite solar cell preparation. TheNiO layer is deposited on a fluorine-doped tin oxide (FTO) glass substrate. In the RTSI setup, the signal output from the interferometer is divided into the reference and testing arms using a nonpolarizing beam splitter (NPBS). The balanced photodetectors then detect the signal, with the FTO/NiO layer placed in the testing armand pure FTOin the reference arm. By analyzing the signal intensities at polarization settings of 0° to 180°, the phase shift and thickness of theNiO layer can be determined. The thickness values of FTOandNiO films obtained through three different phase-shifting algorithms of three-, four-, and five-steps are calculated. The obtained NiO thickness values are validated against scanning electron microscopy (SEM). Finally, by considering the NiO thickness value that exhibits the lowest percentage error compared to one from SEM, it is confirmed that the three-step algorithm is the most suitable scheme for obtaining intensities at 0°, 45°, and 90°. Therefore, the proposed setup shows promise as a replacement forSEMin thickness measurements.
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Phase-matched second-harmonic generation in core-shell nanowire hyperbolic metamaterial
(2022-09-01)
Wicharn, Surawut
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Banerjee, Partha P.
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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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Demonstration of a single-wavelength spectral-imaging-based Thai jasmine rice identification
(2011-07-20)
Suwansukho, Kajpanya
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Sumriddetchkajorn, Sarun
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Buranasiri, Prathan
A single-wavelength spectral-imaging-based Thai jasmine rice breed identification is demonstrated. Our nondestructive identification approach relies on a combination of fluorescent imaging and simple image processing techniques. Especially, we apply simple image thresholding, blob filtering, and image subtracting processes to either a 545 or a 575nm image in order to identify our desired Thai jasmine rice breed from others. Other key advantages include no waste product and fast identification time. In our demonstration, UVC light is used as our exciting light, a liquid crystal tunable optical filter is used as our wavelength seclector, and a digital camera with 640 active pixels × 480 active pixels is used to capture the desired spectral image. Eight Thai rice breeds having similar size and shape are tested. Our experimental proof of concept shows that by suitably applying image thresholding, blob filtering, and image subtracting processes to the selected fluorescent image, the Thai jasmine rice breed can be identified with measured false acceptance rates of <22:9% and <25:7% for spectral images at 545 and 575nm wavelengths, respectively. A measured fast identification time is 25ms, showing high potential for real-time applications. © 2011 Optical Society of America.
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Recursive-formula for second-harmonic generation problem in photonic hypercrystal
(2022-09-01)
Buranasiri, Prathan
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Plaipichit, Suwan
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Puttharugsa, Chokchai
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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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Phase-shifting determination and pattern recognition using a modified Sagnac interferometer with multiple reflections
(2024-02-01)
Usman, Abdullahi
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Bhatranand, Apichai
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Jiraraksopakun, Yuttapong
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Muhammad, Khalid Sabo
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Buranasiri, Prathan
This work has implemented a diverse modification of the Sagnac interferometer to accommodate various measurement requirements, including phase shifting, pattern recognition, and a morphological analysis. These modifications were introduced to validate the adaptability and versatility of the system. To enable phase shifting using the multiple light reflection technique, a half-wave plate (HWP) was utilized with rotations at 0, π/8, π/4, and 3π/8 radians, generating four interference patterns. It is possible to observe a distinct circular fringe width as the polarized light experiences diffraction at the interferometer’s output as it travels through a circular aperture with various diameters ranging from 0.4 to 1 mm. Further modifications were made to the setup by inserting a pure glass and a fluoride-doped tin oxide (FTO) transparent substrate into the common path. This modification aimed to detect and analyze a horizontal fringe pattern. Subsequently, the FTO substrate was replaced with a bee leg to facilitate morphology recognition. A deep learning-based image processing technique was employed to analyze the bee leg morphology. The experimental results showed that the proposed scheme succeeded in achieving the phase shift, measuring hole diameters with errors smaller than 1.6%, separating distinct transparent crystals, and acquiring the morphological view of a bee’s leg. The method also has successfully achieved an accurate surface area and background segmentation with an accuracy over 87%. Overall, the outcomes demonstrated the potential of proposed interferometers for various applications, and the advantages of the optical sensors were highlighted, particularly in microscopic applications. © 2024 Optica Publishing Group
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Accurate RMS calculations for periodic signals by Trapezoidal rule with the least data amount
(2013-11-12)
Poomjan, Sompop
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Taengtang, Thammarat
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Srinuanjan, Keerayoot
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Kamoldilok, Surachart
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Buranasiri, Prathan
The purpose of this research is to present a simple method using the least data amount to calculate root mean square (RMS) values of periodic signals (constructed from Fourier series) which the highest harmonic order is known or able to be estimated. In the research, trapezoidal rule with the least data amount was proved and tried to calculate definite integral values of sinusoidal signals from a lot of trial runs until a significant property was found. Then the property would be deployed to calculate RMS values. Results of the research can provide not only more convenient processes of simple trapezoidal rule but also more accurate results than the patented Simpson's rule in the same least data amount. © 2013 Sompop Poomjan et al.
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Photorefractive Effect in an Imperfect Cerium Doped Barium Titanate Crystal: Reflection Grating Case
(2026-01-01)
Khotphuthon, Wasuphon
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Plaipichit, Suwan
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Suchat, Suebtarkul
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Buranasiri, Prathan
The photorefractive (PR) effect, a nonlinear optic phenomenon, occurs in materials that have electro-optic (EO) properties. When two coherent beams of light interfere with each other in a PR material, donor electrons between valence band and conduction band, caused by material impurity, absorb the photon and are excited into the conduction band and generate electron-hole pairs. This process induces a periodic electric field called a space charge field that alters the material’s refractive index due to the EO effect. In this research, we explored reflection grating (RG) in an imperfect Ce-doped BaTiO3 crystal and then showed optical image correlation using the RG. Two beam coupling was investigated using two non-Gaussian incident beams on the opposite surface of an imperfect Ce-doped BaTiO3 crystal. Light at green wavelengths from a semiconductor laser was used as the source of the incident beams and entered at certain angles relative to the crystal c-axis. Large beam coupling power was observed in both incident directions when the angle between both incident beams is at Bragg’s angle in the direction of the c-axis. The diffraction light was found to be in the same polarization as the incident beam. In addition, interesting results for the optical correlation using reflection grating were demonstrated. These results suggest that by doping BaTiO3 with cerium, strong beam coupling or photorefractive grating can be observed with certain incident writing angles on the crystal, which could be utilized in future flexible holographic devices in the future.
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Effect of the carbon dioxide concentration on the Refractive Index of air in a long gauge block interferometer
(2020-07-03)
Kohmun, Kanokporn
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Limsuwan, Pichet
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Ranusawud, Monludee
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Buranasiri, Prathan
In our previous work, four environment parameters including temperature, pressure, relative humidity and carbon dioxide concentration in a long gauge block interferometer chamber were measured continuously for 24 h. The refractive index of air in the chamber depending on three measured parameters was determined using the updated Edlén equation by assuming that CO<inf>2</inf> concentration is constant at 450 ppm. In this study, the carbon dioxide concentration term was added into the updated Edlén equation and four environment parameters including temperature, pressure, relative humidity and CO<inf>2</inf> concentration were measured continuously for 12 h. To characterize the influence of the carbon dioxide concentration on the refractive index of air in a long gauge block interferometer chamber, the refractive index of the chamber contents was determined using updated Edlén equations with constant and with variable carbon dioxide concentration terms. The results showed that the refractive index values obtained from the updated Edlén equations with constant and variable CO<inf>2</inf> concentration terms were equal to 1.000268244 and 1.000268261, respectively.
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The direct measurement of the photorefractive grating on anisotropic self diffraction using digital holography
(2014-09-02)
Plaipichit, Suwan
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Buranasiri, Prathan
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Ruttanapun, Chesta
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Jindajitawat, Phumin
In this paper, the measurement of grating period in photorefractive anisotropic self diffraction by using digital holography technique is proposed. In our experimental setup, He -Ne laser beam with wavelength of 632.8 nm has been separated and then incident on photorefractive cerium doped barium titanate crystal to produce photorefractive index grating. The transmitted probe beam, which contains phase and amplitude has been expanded and recorded on digital camera. To explore the grating periods, both phase and amplitude of the images are reconstructed by numerical process using computer. Then the grating periods in photorefractive anisotropic self diffraction have been measured. The results show grating periods, holograms and their reconstruction. © 2014 Taylor & Francis Group, LLC.

Buranasiri, Prathan

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