Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Opt Express. 2009 Feb 16;17(4):2707-13.

Effect of subwavelength annular aperture diameter on the nondiffracting region of generated Bessel beams.

Author information

  • 1Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan.

Abstract

A subwavelength annular aperture (SAA) made on metallic film and deposited on a glass substrate was fabricated by electron-beam lithography (EBL) and which was followed by a metal lift-off process to generate a long propagation range Bessel beam. We propose tuning the focal length and depth of focus (DOF) by changing the diameter of the SAA. We used finite-difference time domain (FDTD) simulations to verify our experimental data. We found that the position of the Bessel Beam focus spot (i.e. focal length) will be farther away from the SAA plane as the diameter of the SAA increases. In addition, the depth of focus (DOF) which is the length of the Bessel beam non-diffracting area, also increases as the diameter of the SAA expands.

PMID:
19219175
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for Optical Society of America
    Loading ...
    Write to the Help Desk