A5037066664- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Gold and Silver Nanoparticles Synthesis and Applications
- Optical Coatings and Gratings
- Microfluidic and Bio-sensing Technologies
- Advanced biosensing and bioanalysis techniques
- Biosensors and Analytical Detection
- Liquid Crystal Research Advancements
- Photonic Crystals and Applications
- Plant Reproductive Biology
- Advanced Biosensing Techniques and Applications
- Molecular Junctions and Nanostructures
- Lipid Membrane Structure and Behavior
- Bacterial biofilms and quorum sensing
- Advanced Fiber Optic Sensors
Ben-Gurion University of the Negev
2014-2023
Center for Nanoscale Science and Technology
2014
Excitation of localized surface plasmons (LSPs) metal nanoparticles (NPs) residing on a flat film has attracted great attention recently due to the enhanced electromagnetic (EM) fields found be higher than case NPs dielectric substrate. In present work, it is shown that even much enhancement EM obtained by exciting LSPs through extended (ESPs) generated at metallic using Kretschmann–Raether configuration. We show largest field and highest surface-enhanced fluorescence intensity are when...
Using an insulator-metal-insulator structure with dielectric having refractive index (RI) larger than the analyte, long range surface plasmon (SP) resonance exhibiting ultra-high penetration depth is demonstrated for sensing applications of large bioentities at wavelengths in visible range. Based on diverging beam approach Kretschmann-Raether configuration, one SP resonances shown to shift response changes analyte RI while other fixed; thus, it can be used as a built reference. The...
Dielectric grating-based sensors are usually based on the guided mode resonance (GMR) obtained using a thin planar waveguide layer (PWL) adjacent to subwavelength grating layer. In this work, we present detailed investigation of thick dielectric structures that exhibit reflection resonances above certain thickness without need for layer, showing great potential applications in biosensing and tunable filtering. Analytic numerical results thoroughly discussed, as well an experimental...
Liquid crystal Fabry-Perot tunable filters are investigated in detail, with special attention to their manufacturability, design, tolerances, and polarization independence. The calculations were performed both numerically analytically using the 4×4 propagation matrix method. A simplified analytic expression for is derived case of nematic LC homogeneous geometry. At normal incidence, it shown that one can use 2×2 Abeles method; however, at oblique method needed. effects dephasing originating...
When localized surface plasmons (LSPs) are coupled to extended (ESPs), higher density of particles causes stronger interaction, larger Rabi splitting (RS), and plasmonic energy band gap. Optimization the field enhancement (FE) is addressed theoretically experimentally particularly because ultrahigh FE was found recently exist when LSPs excited via ESPs under prism grating coupling. The RS, weaker FE, at optimum density, RS almost vanishes. Under free-space excitation, for some periodicities...
Plasmon waveguide resonance (PWR) sensors exhibit narrow resonances at the two orthogonal polarizations, transverse electric (TE) and magnetic (TM), which are narrower by almost an order of a magnitude than standard surface plasmon (SPR), thus figure merit is enhanced. This fact useful for measuring optical anisotropy materials on determining orientation molecules with high resolution. Using diverging beam approach liquid crystal retarder, we present experimental results simultaneous...
A polarization independent Fabry–Perot liquid crystal tunable filter coupled to an optical fiber is demonstrated using diversity. Using a Wollaston prism, the beam splits into two orthogonal beams, while of one beams rotated by 90 deg variable half wave plate. The are then combined fiber. Tuning unpolarized light over range 720 800 nm demonstrated.
Excitation of localized surface plasmons (LSPs) metal nanoparticles (NPs) residing on a flat film has attracted great attentions recently due to the enhanced electromagnetic (EM) fields found be higher than case NPs dielectric substrate. In present work, it is shown that even much enhancement EM obtained by exciting LSPs through extended (ESPs) generated at metallic using Kretschmann-Raether configuration. We show largest field and highest surface-enhanced fluorescence intensity are when...
Unwelcomed biofilms are problematic in food industries, surgical devices, marine applications, and wastewater treatment plants; essentially everywhere where there is moisture. Very recently, label-free advanced sensors such as localised extended surface plasmon resonance (SPR) have been explored tools for monitoring biofilm formation. However, conventional noble metal SPR substrates suffer from low penetration depth (100 - 300 nm), preventing the reliable detection of large entities single...