Sensing applications on refractive index based on metal gratings

• Sensing applications on refractive index based on metal gratings are investigated. The excitation of surface plasmon on a metal grating placed in planer or conical mounting is examined. Numerical results are compared with experimental data. When a TM wave illuminates a metal grating, total or partial absorption of incident light occurs at angles of incidence at which the surface plasmon waves are excited. A conical mounting is introduced in the sensing application in which an enhancement of TM-TE mode conversion is observed in close vicinity to the resonance angle at which almost of the reflected light is in TE polarization. This, hence, makes the reciprocal of the TM-wave efficiency a good measure in finding the angles of incidence at which the surface waves are excited, which leads to a precise measurement. Yasuura's modal-expansion method is introduced in the numerical simulation. The setup for sensing application is represented in details.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Nanoteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Nano-technology (hsv//eng)

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

Nyckelord

Absorption

Computer simulation

Diffraction gratings

Fluid dynamics

Fluid mechanics

Light refraction

Materials science

Metals

Optical properties

Photonics

Plasmons

Refractive index

Refractometers

Stereochemistry

Storage allocation (computer)

Surface waves

(1 1 0) surface

Angles of incidence (AOI)

Bio photonics

Conical mounting

expansion methods

Experimental data

Incident light

International symposium

Metal gratings

Metamaterials (MTM)

Nano-photonics

numerica l results

Numerical simulations

Partial absorption

Precise measurements

Resonance angle

Sensing applications

Surface plasmon (SP)

Surface plasmon waves (SPW)

TE modes

Transverse electric (TE) polarizations

wave efficiency

Waves

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