Caltech Optical Imaging Laboratory;
Andrew and Peggy Cherng Department of Medical Engineering;
Department of Electrical Engineering;
California Institute of Technology;
1200 East California Boulevard;
Mail Code 138-78;
Pasadena;
CA 91125;
USA;
Present address:CentreÉnergie Matériaux Télécommunications;
Institut National de la Recherche Scientifique;
1650 Boulevard Lionel-Boulet;
Varennes;
QC J3X1S2;
Canada;