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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Low-loss plasmon-triggered switching between reflected free-space diffraction orders.

J Sauvage-Vincent, Y Jourlin, V Petiton

|June 13, 2014

Summary

This summary is machine-generated.

Surface plasmon coupling using a grating controls reflected light beams. This method allows switching between diffracted and reflected orders with minimal energy loss.

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Area of Science:

Optics and Photonics
Condensed Matter Physics

Background:

Surface plasmon resonance (SPR) is a phenomenon at the interface of a metal and a dielectric.
Diffraction gratings are used to manipulate light beams by scattering them into specific orders.

Purpose of the Study:

To investigate the coupling of surface plasmons with free-space beams using a diffraction grating.
To demonstrate the control and switching of reflected light orders through plasmon-mediated effects.

Main Methods:

Utilizing a TM polarized free-space incident beam.
Employing a smooth corrugation grating on a metal surface.
Analyzing the +1st or -2nd diffraction orders for surface plasmon coupling.

Main Results:

Cancellation of the -1st order diffracted beam and maximum 0th order Fresnel reflection observed.
Reversal of these conditions achieved by adjusting grating parameters or incident light.
Demonstrated switching between -1st and 0th reflected orders via angular tilting or wavelength scanning.

Conclusions:

Surface plasmon coupling with gratings offers efficient control over free-space beam reflection.
The observed effect exhibits remarkably low absorption losses, making it suitable for optical applications.
This technique provides a novel method for manipulating light propagation with high efficiency.