Journal of Optoelectronical Nanostructures
Volume:8 Issue: 3, Summer 2023

Abstract This paper proposes a new plaintext-related mechanism based on plaintext encryption.  For simplicity, PCODE was proposed as the image encryption code. The original picture was encoded to get the proposed encryption and plaintext encryption with a chaotic sequence to control the PCODE rules. Another chaotic sequence was encoded into a PCODE sequence for the PCODE XOR operation. The remaining two chaotic sequences were then processed with the proposed scheme to get two key streams for the permutation phase. The cipher image was obtained after the conventional permutation and PCODE XOR operations. The use of the proposed plaintext encryption leads to the correlation between the keystreams used in the displacement phase and both the secret key and the plaintext image. This correlation increases the sensitivity and security of the encryption system with respect to the plaintext. The experimental findings from simulation show that the proposed encryption system shows significant efficiency and security.

The present study proposes a novel indium gallium phosphide/aluminum gallium indium phosphide (InGaP/InAlGaP) double junction solar cell without an anti-reflection coating that includes an upper InGaP cell, a lower InAlGaP cell, and a gallium arsenide (GaAs) tunnel junction. To increase the efficiency of the cell, a new window layer was used at the upper junction. To achieve higher efficiency, the researchers also optimized the back surface field layer of the lower cell. The results were analyzed via numerical modeling with Silvaco/Atlas software under the AM1.5 radiation spectrum. Findings suggested that using the sun=1 parameter, the obtained maximum values of short-circuit current, open-circuit voltage, fill factor, and efficiency parameters for the proposed solar cell structure were Jsc = 24.078 mA/cm2, Voc = 3.41886, FF = 91.1836, and Eff = 71.721%, respectively.

The surface-enhanced Raman scattering (SERS) method is a widely used technique for molecular structure analysis. This method relies on the enhancement of the Raman signal through the use of plasmonic nanostructures, such as gold and silver, which serve as substrate sensors. The use of pre-made sensors can effectively enhance the efficiency and cost-effectiveness of SERS. In this study, we used a fast, simple, and cost-effective method to create a suitable substrate for SERS analysis. Initially, gold colloidal nanoparticles with dimensions ranging from 50 to 80 nm were synthesized and deposited onto glass slides to create a uniform and rough substrate. To stabilize the gold nanoparticles, a sulfur compound called "1-dodecanethiol" was selected, increasing the contact angle of the sample to 45° on the glass slide. Florfenicol, one of the most common antibiotic residues in muscle foods, was selected as an analyte. Spectrum acquisitions at various points on a single slide demonstrated acceptable substrate uniformity (RSD = 8.44%). Further experiments conducted on different slides confirmed the consistency of the results (RSD = 7.90%). Finally, the reliability of the results was confirmed through spectrum acquisitions over various time intervals (RSD = 1.26%).

This study introduces an efficient D-shaped sensor for refractive index (RI) sensing based on the surface plasmon resonance (SPR) phenomenon. The sensor design was examined through numerical simulations utilizing the finite element method (FEM). The calculations revealed that the proposed fiber demonstrates particular suitability for sensing within the wavelength spectrum spanning from 0.5 to 0.7μm. Our results yielded a remarkable wavelength sensitivity and substantial RI resolution of 9500 nm/RIU and 6.5 ×10–6 RIU, respectively which observed as the analyte RI ranged 1.33~1.36. Additionally, a maximum amplitude sensitivity of 215 RIU–1, accompanied by an impressive linearity of 0.99862 was acheived.

Abstract
Chemotherapy effects on cancer cells and normal cells that grow and divide quickly. The use of methods to reduce the side effects of chemotherapy is always considered. Nanotechnology open the novel new ways for this purpose. Drug delivery with Nano compounds is very useful for decreasing side effects of drugs. In addition, the use of computer methods increases the speed of reaching the best results and reduces the costs of research processes. In this study, the interactions between single wall carbon nanotube and the molecules of anti-cancer drugs was investigated. Energy, dipole momentum and the NMR chemical shift of Busulfan, Fluorouracil and Mercaptopurine in binding with CNT are calculated in density functional theory methods (DFT) and Hartree-Fock (HF) with 3-21G and STO-3G basis sets. We also tested solubility after the optimization. At the B3LYP level of theory we find a very good performance of the computational calculations that allows to distinguish structures and active sites of systems by NMR calculation step.

Abstract
Plasmons in nanometer structures are caused by the interaction between electromagnetic waves and electrons on the metal surface. In this article, a comprehensive and detailed investigation of the effect of effective parameters on the performance of structured MIM waveguides (metal-insulator-metal) has been carried out. These structures are widely used in sensor applications based on refractive index changes or filters. This paper examines the impacts of altering factors like waveguide size, metal type, and insulation while also proposing novel structures with circular and square resonators,Then we simulated the structure of the MIM waveguide connected to the cavity of the T-shaped resonator for different values for the length L of the cavity, It is possible that this issue has a good use in filters and systems with high bandwidth to separate channels  . Also,the properties of surface plasmon polaritons emission were investigated in the case where a resonator is vertically connected to it. The transmission diagram had compared to the MIM waveguide without resonator.