Optics and Photonics Society of Iran 

About: Optics and Photonics Society of Iran is an academic journal. The journal publishes majorly in the area(s): Photonics & Laser. Over the lifetime, 1450 publications have been published receiving 310 citations.

Effect of aluminum nanoparticle size on the linear and nonlinear optical properties of PVA

Abstract: Linear and nonlinear optical properties of Polyvinyl Alcohol thin film doped with aluminum nanoparticles have been investigated experimentally. Aluminum nanoparticles were produced using pulsed laser ablation method. The fundamental wavelength of Nd-YAG laser at 7 ns pulse width was employed to produce aluminum nanoparticles in water at different sizes and concentrations. TEM images were used to study the nanoparticles after ablation. UV–Vis–NIR spectroscopy data were used to extract the real and imaginary parts of refractive index and dielectric functions of films and z-scan technique was used to measure the nonlinear refractive index and absorption coefficient of films. Results show that in comparison with particle size, the concentration of doped nanoparticles is more effective on the optical properties of polymers thin films. Band gap energy of polymer films was decreased with decreasing the size and increasing the concentration of nanoparticles while their refractive index was decreased.

Performance Enhancement of Nanohole Array-based Plasmonic Color Filters for CMOS Image Sensors

Abstract: Color filters play a key role for applications like CMOS image sensors, liquid crystal displays and light emitting diodes. Using a nanohole array as a plasmonic color filter offers important advantages, in particular compatibility with CMOS processes. In this paper, a set of primary filters (red, green and blue) consisting of a square-lattice of sub-wavelength holes in an aluminum film and a silicon dioxide substrate are presented for employing in CMOS image sensors. Despite their simple structure and ease of fabrication, the results have shown a transmission peak of 30-67 percent with a FWHM of 40 nm, 50 nm and 105 nm in accurate wavelengths of red, green and blue, respectively. Furthermore, reducing the cross-talk of the filters is investigated by utilizing a silicon dioxide overlay to enhance the coupling of SPPs at both sides of the aluminum film.

Evanescent Field Optical Pressure on a Cell in a Resonant Structure

Abstract: In this paper, the optical pressure acting on a cell (membrane-cytoplasm-membrane) arising from the evanescent field of a guided wave in a multilayer resonance structure is investigated theoretically. The effects of the waveguiding film thickness and the sample refractive index on the optical pressure are numerically analyzed. Results show one or two orders of magnitude enhancement in the optical pressure compared to that in metal layer structures. Moreover, depending on the refractive index of the sample, the optical pressure can be attractive or repulsive.