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Fabrication of phase masks with variable diffraction efficiency using HEBS glass technology.

Tomasz Osuch1, Andrzej Kowalik, Zbigniew Jaroszewicz

  • 1National Institute of Telecommunications, Szachowa 1, 04-894 Warsaw, Poland. T.Osuch@itl.waw.pl

Applied Optics
|November 17, 2011
PubMed
Summary

A novel method fabricates apodized diffractive optical elements using high energy beam sensitive glass. This technique simplifies mass production of variable diffraction efficiency phase masks, offering an efficient alternative to direct writing methods.

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Area of Science:

  • Optical Engineering
  • Nanofabrication

Background:

  • Diffractive optical elements (DOEs) are crucial for manipulating light.
  • Traditional fabrication methods for apodized DOEs can be complex and labor-intensive.
  • Variable diffraction efficiency is key for advanced optical system design.

Purpose of the Study:

  • To propose and demonstrate a new, efficient fabrication method for apodized diffractive optical elements.
  • To leverage halftone mask technology for generating variable diffraction efficiency phase masks.
  • To assess the suitability of the proposed method for mass production.

Main Methods:

  • Utilizing high energy beam sensitive (HEBS) glass as a halftone mask.
  • Generating phase masks in a resist layer via photolithography.

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  • Employing single-shot projection photolithography with a reusable amplitude mask.
  • Manufacturing and characterizing three prototypes of apodized phase masks.

    • Main Results:

    • Successfully fabricated apodized phase masks using the proposed HEBS glass halftone mask method.
    • Demonstrated the effectiveness of the technique for generating variable diffraction efficiency.
    • The method proved simpler and less laborious than direct variable-dose pattern writing.
    • Identified key advantages and limitations of the developed fabrication technology.

    Conclusions:

    • The proposed fabrication method offers a viable and efficient approach for producing apodized diffractive optical elements.
    • The use of HEBS glass as a halftone mask is particularly effective for mass production scenarios.
    • Further characterization and optimization can enhance the applicability of this technology in optical manufacturing.