1. Department of Chemistry and Biochemistry and Optoelectronic Computing Systems Center, Campus Box 215, University of Colorado, Boulder, CO 80309-0215, USA.
2. Department of Physics and Optoelectronic Computing Systems Center, Campus Box 390, University of Colorado, Boulder, CO 80309-0390, USA.
3. Displaytech, 2200 Central Avenue, Boulder, CO 80301, USA.