A normalized contrast method on a Superluminescent diode (SLD) low coherence interferometer could retrieve 2D image concealing under a light-scattering medium. In addition, a continuous wavelet transform on both white light and SLD vertical scanning interferometry could construct 3D profile of the interfaces in a dual-layer structure. In this research, 3D information on surface, concealing...
Perylene derivative were used as electron acceptor in non-fullerene organic solar cells using the structure of ITO/PEDOT:PSS/PCDTBT:Acceptor/TiO$_x$/Al. Unfortunately, PCDTBT:Perylenediimide photoactive device showed a low power conservation efficiency (PCE),compared to a PCDTBT:PC$_{70}$BM photoactive device. This results has been observed in reduced short circuit current (I$_{sc}$ ) and open...
Blood stains at crime scenes are among the most important types of evidence for forensic investigators. We can use bloodstains to determine the time elapsed since the crime took place by measuring the color changing of blood stain with reflectance spectroscopy. The color of blood stain changes with time from red to brown due to the change of chemical composition in hemoglobin that is...
Quantum key distribution (QKD) concerns creation and distribution of unbreakable symmetric one-time keys which are used in classical message encryption and decryption. Using quantum properties, the QKD security is enhanced by observation of qubit errors rates (QBER). Although the quantum principles, such as no-cloning theorem, imply that QKD has strong safety, the imperfect devices can yield...
A generation of cross-polarized wave (XPW) in nonlinear hyperbolic metamaterials (NHMM), which are composed of periodic arrangement of gold (Au) and barium difluoride (BaF2) layers with subwavelength thickness for exhibiting anisotropy of permittivity and third-order nonlinearity, has been investigated numerically. This cubic nonlinear effect is described by degenerate four-wave mixing (DFWM)...
In this work, we develop a Fortran program to simulate the propagation of high-frequency plane acoustic wave through Fresnel zone plate (FZP) in two dimensions. The simulation was carried out at the frequency of 200 kHz with the wave speed of 1,500 m/s. The thickness of FZP was also varied to determine its effect on the focusing of FZP. Numerical results show that FZP could successfully focus...
In this research we have designed and constructed the first off-null ellipsometer based on smartphone platform. The principle design of this ellipsometer is configured to use a smartphone screen as a light source and front phone camera as a detector. Thus the configuration of the optical coupler is necessary to collect a parallel beam of linearly polarized light from a phone screen and direct...
The experiment was conducted to study strain distribution in circular disk of PMMA by photoelasticity in reflection polariscope. The strain in circular disk was induced by two point load of hydraulic system 535.37-994.63 N with the step increase of 153.21 N. We added the Babinet compensater in basic reflection polariscope to observe the fractional isochromatic fringe order in the first...
Modern analysis of organic materials by using light absorptions are very popular both in industries and research laboratories. Typically, UV-VIS spectrophotometer are used. UV-VIS consist of broad spectrum gas light source and UV source, monochromator and light detectors. The UV-VIS is very complicated and expensive. In this research we would like to develop simple and cheap spectrophotometer...
