Author Affiliations

Kenneth J. Grant,^1,2 James A. Piper,¹ Donald J. Ramsay,¹ and Keith L Williams³

¹When this research was done K. J. Grant, J. A. Piper, and D. J. Ramsay were with the Centre for Lasers and Applications Macquarie University, North Ryde, New South Wales 2109, Australia.

²Electronics Research Laboratory, Defence Science and Technology Organisation, P.O. Box 1600, Salisbury, South Australia 5108, Australia.

³School of Biological Sciences, Macquarie University, North Ryde, New South Wales 2109, Australia.