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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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Grating coupler dispersion compensation with a surface-relief reflection grating.

T A Strasser, M C Gupta

|October 2, 2010

Summary

This summary is machine-generated.

Surface-relief reflection gratings enhance grating coupler wavelength range. This technology extends the full width at half maximum (FWHM) input coupling efficiency from 0.7 to 17 nm, enabling broader applications in optics.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Grating couplers are essential for efficient light coupling in photonic devices.
Current grating couplers have limited wavelength bandwidth, restricting their applications.

Purpose of the Study:

To investigate the use of surface-relief reflection gratings to enhance the wavelength bandwidth of grating couplers.
To analyze the potential for extending the full width at half maximum (FWHM) of input and output coupling efficiency versus wavelength.

Main Methods:

Experimental characterization of diffraction efficiency from surface-relief reflection gratings.
Dispersion-matching calculations for output coupling scenarios.
Analysis of lateral beam shift due to angular dispersion for input coupling.

Main Results:

Extended the FWHM input coupling efficiency versus wavelength from 0.7 nm to 17 nm using surface-relief reflection gratings.
Demonstrated high diffraction efficiency over a wide wavelength range.
Calculations show potential FWHM extension to 33 am for output coupling applications.

Conclusions:

Surface-relief reflection gratings significantly broaden the operational wavelength range of grating couplers.
The lateral beam shift from angular dispersion is a key factor limiting wavelength compensation in input coupling.
This advancement offers improved performance for wavelength-sensitive photonic applications.