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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

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Published on: July 18, 2015

Design of a circular Dammann grating.

Shuai Zhao¹, Po Sheun Chung

¹Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong. shuai.zhao@plink.cityu.edu.hk

|August 2, 2006

Summary

A new circular Dammann grating generates uniform impulse rings. Ring intensities correlate with grating function coefficients, enabling precise optical control.

Area of Science:

Optics and Photonics
Diffractive Optics
Nanofabrication

Background:

Dammann gratings are essential for beam shaping.
Generating uniform intensity rings is a challenge in optical applications.
Controlling diffraction orders is key for advanced optical systems.

Purpose of the Study:

To propose a novel circular Dammann grating for uniform impulse ring generation.
To analyze the relationship between grating function and ring intensity.
To define and evaluate diffraction efficiency and uniformity for this new device.

Main Methods:

Circular sine series decomposition of the grating function.
Numerical simulations of binary phase circular Dammann gratings.
Fabrication using e-beam direct writing technique.

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Main Results:

Demonstrated generation of uniform-intensity impulse rings.
Ring intensities are predictable via sine series coefficients.
Successful experimental validation of a three-order circular Dammann grating.

Conclusions:

The novel circular Dammann grating effectively produces uniform impulse rings.
This design offers precise control over ring intensities based on grating parameters.
Experimental results confirm the theoretical predictions and fabrication viability.