High sensitivity is obtained at larger resonant incident angle if negative diffraction order of metallic grating is used to excite the surface plasmon. A highly sensitive grating-based surface plasmon resonance (SPR) sensor is designed for the hydrogen detection. A thin palladium (Pd) film deposited on the grating surface is used as transducer. The influences of grating period and the thickness...

We report on the ultrafast laser inscription (ULI) of volume phase gratings inside gallium lanthanum sulphide (GLS) chalcogenide glass substrates. The effect of laser pulse energy and grating thickness on the dispersive properties of the gratings is investigated, with the aim of improving the performance of the gratings in the mid-infrared. The grating with the optimum performance in the mid-in...

In this paper we investigate the potential of light trapping with diffraction gratings for organic solar cells. The architecture of the solar cell is based on conjugated polymers and a buckminsterfullerene derivative (PCBM), forming an interpenetrating donor-acceptor-network. The motivation for light trapping is the small absorptance of the photoactive polymer in the range of the solar spectrum...

A two-grating interferometer setup is described for fabricating large area grating structures via laser ablation with UV femtosecond pulses. Phase grating pairs on fused silica substrates with high damage threshold and diffraction efficiency were illuminated with non-collimated (convergent) laser beams to generate a periodic intensity distribution with high energy density and high contrast on t...

Grating is one of the widely used optical elements in modern optics, and grating constant determines many properties grating. The smart phone screen a regular Based on formula, this paper improves simplifies experimental device, measures through diffraction pattern reflected by normal grazing incidence laser pen. By comparing with theoretical value, it found that measured value good agreement r...

The performance of a chirped waveguide grating as a wavelength demultiplexer has been investigated. Considerations include TE-‘LX, TE-TM and TM-TM mode coupling for different incident angles and waveguide parameters. The spectral response of the chirped sinusoidal surface relief grating in the optical waveguide has been studied by means of Local Normal Mode Expansion (LNME) theory to account fo...