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Applied Optics

Applied Optics


  • Vol. 41, Iss. 5 — Feb. 1, 2002
  • pp: 902–908

Transfer of micro-optical structures into GaAs by use of inductively coupled plasma dry etching

Mikael Karlsson and Fredrik Nikolajeff  »View Author Affiliations

Applied Optics, Vol. 41, Issue 5, pp. 902-908 (2002)

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The transfer of continuous-relief micro-optical structures from resist into GaAs by the use of direct-write electron-beam (e-beam) lithography followed by dry etching in an inductively coupled plasma is demonstrated. BCl3-Ar chemistry was found to give satisfactory results; N2 and Cl2 were added to change the selectivity between GaAs and e-beam resist. The transfer process generates smooth etched structures. Distortion of the diffractive structures in the transfer process was examined. Blazed gratings with a period of 10 µm were optically evaluated with a 940-nm VCSEL. This grating was a five-step approximation of a blazed profile. The diffraction efficiency was 67% in the first order, with a theoretical value of 87%. Also, simulations of the optical performance of the transferred diffractive elements were made by use of a Fourier transform of the grating profile. Our goal is to integrate micro-optical structures with VCSELs.

© 2002 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(140.3300) Lasers and laser optics : Laser beam shaping
(160.6000) Materials : Semiconductor materials
(220.4000) Optical design and fabrication : Microstructure fabrication
(350.3950) Other areas of optics : Micro-optics

Original Manuscript: May 8, 2001
Revised Manuscript: October 1, 2001
Published: February 10, 2002

Mikael Karlsson and Fredrik Nikolajeff, "Transfer of micro-optical structures into GaAs by use of inductively coupled plasma dry etching," Appl. Opt. 41, 902-908 (2002)

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