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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 2 — Jan. 26, 2004
  • pp: 227–233

Self-organized formation of a Blazed-grating-like structure on Si(100) induced by focused ion-beam scanning

Yongqi Fu, Ngoi Kok Ann Bryan, and Wei Zhou  »View Author Affiliations


Optics Express, Vol. 12, Issue 2, pp. 227-233 (2004)
http://dx.doi.org/10.1364/OPEX.12.000227


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Abstract

A new one-step method, which has been named self-organized formation, for microfabrication of blazed-grating-like structures after bombardment with a focused ion beam (FIB) with an ion energy of 50 keV and a beam current of 0.5 nA is presented. The structure is fabricated by the FIB by raster scanning (not by patterned scanning) upon a substrate of a silicon wafer, Si(100), with total scanning time of 14 min. With this method the parameters are unchanged during the whole process, unlike for the point-by-point direct writing technique, in which the exposure intensity or the electron- or ion-beam dose is changed for each point. The surface roughness of the structure, Ra, is 2.5 nm over an area of 1 µm×1 µm. To evaluate the performance of this method we carried out a simulation, using the PCGrate program. The simulated diffraction efficiency, of diffraction order -3 working in the reflection mode, can be as much as 79.1% for the violet wavelength of 400 nm. Using a He–Ne laser as the light source produced a measured diffraction efficiency of the order of -2 of 70.4%, which is near the simulated value of 76.9% at a wavelength of 600 nm. The depth and the period of the structure can be controlled by process parameters of the FIB, such as ion energy and ion flux.

© 2004 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1970) Diffraction and gratings : Diffractive optics
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.4000) Optical design and fabrication : Microstructure fabrication

ToC Category:
Research Papers

History
Original Manuscript: November 11, 2003
Revised Manuscript: December 17, 2003
Published: January 26, 2004

Citation
Yongqi Fu, Ngoi Bryan, and Wei Zhou, "Self-organized formation of a Blazed-grating-like structure on Si(100) induced by focused ion-beam," Opt. Express 12, 227-233 (2004)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-12-2-227


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References

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