A tunable high-efficiency optical switch based on graphene...

A tunable high-efficiency optical switch based on graphene coupled photonic crystals structure

A plasmonic device for high-efficiency optical switch is proposed based on graphene coupled photonic crystals structure. The finite-difference time-domain simulation results show that the transmission and reflection ratio can be controlled by tuning the parameters of the graphene strip, such as chemical potential or width. And the corresponding contrast ratio can be 25 and 26.8 for a single […]

Band structure engineered layered metals for low-loss plas...

Band structure engineered layered metals for low-loss plasmonics

  Plasmonics currently faces the problem of seemingly inevitable optical losses occurring in the metallic components that challenges the implementation of essentially any application. In this work, they show that Ohmic losses are reduced in certain layered metals, such as the transition metal dichalcogenide TaS2, due to an extraordinarily small density of states for scattering […]

Congratulations on the acceptance of the paper “Optical de...

Congratulations on the acceptance of the paper “Optical detection of brain activity using plasmonic ellipsometry technique”

    The paper entitled “Optical detection of brain activity using plasmonic ellipsometry technique” is written by Foozieh Sohrabi under the direct supervision of  Dr Seyedeh Mehri Hamidi and it is accepted in the journal of Sensors and Actuators B: Chemical. In this paper, a new method of optical detection of brain activity has been proposed. […]

Controllable design of super-oscillatory lenses with multi...

Controllable design of super-oscillatory lenses with multiple sub-diffraction-limit foci

The conventional multifocal optical elements cannot precisely control the focal number, spot size, as well as the energy distribution in between. Here, the binary amplitude-type super-oscillatory lens (SOL) is utilized, and a robust and universal optimization method based on the vectorial angular spectrum (VAS) theory and the genetic algorithm (GA) is proposed, aiming to achieve […]

Dynamic plasmonic colour display

Dynamic plasmonic colour display

Plasmonic colour printing based on engineered metasurfaces has revolutionized colour display science due to its unprecedented subwavelength resolution and high-density optical data storage. However, advanced plasmonic displays with novel functionalities including dynamic multicolour printing, animations, and highly secure encryption have remained in their infancy. Here they demonstrate a dynamic plasmonic colour display technique that enables all […]

Fano resonance with high local field enhancement under azi...

Fano resonance with high local field enhancement under azimuthally polarized excitation

Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, they demonstrate a plasmonic Fano resonance resulting from the interference between a narrow magnetic dipole mode and a broad electric dipole mode in a split-ring […]

Congratulations to Foozieh Sohrabi

Congratulations to Foozieh Sohrabi

  “Congratulations to Foozieh Sohrabi for getting Shahid Shahriyari Scholarship”

Clathrate colloidal crystals

Clathrate colloidal crystals

DNA-programmable assembly has been used to deliberately synthesize hundreds of different colloidal crystals spanning dozens of symmetries, but the complexity of the achieved structures has so far been limited to small unit cells.They assembled DNA-modified triangular bipyramids (~250-nanometer long edge, 177-nanometer short edge) into clathrate architectures. Electron microscopy images revealed that at least three different structures […]

Ultrasensitive detection of HIV-1 p24 antigen by a hybrid ...

Ultrasensitive detection of HIV-1 p24 antigen by a hybrid nanomechanical-optoplasmonic platform with potential for detecting HIV-1 at first week after infection

     Early detection of HIV infection is the best way to prevent spread of the disease and to improve the efficiency of the antiretroviral therapy. Nucleic acid amplification tests (NAAT) have become the gold-standard for detecting low-concentrations of the virus in blood. However, these methods are technically demanding and cost-prohibitive in developing countries. Immunoassays […]

Coherent Terahertz Radiation from Multiple Electron Beams ...

Coherent Terahertz Radiation from Multiple Electron Beams Excitation within a Plasmonic Crystal-like structure

Coherent terahertz radiation from multiple electron beams excitation within a plasmonic crystal-like structure (a three-dimensional holes array) which is composed of multiple stacked layers with 3 × 3 subwavelength holes array has been proposed in this paper. It has been found that in the structure the electromagnetic fields in each hole can be coupled with […]

Calendar

January 2018
S M T W T F S
« Dec    
 123456
78910111213
14151617181920
21222324252627
28293031  

Best Sites