Center for Integrated Nanotechnologies;
Los Alamos National Laboratory;
Los Alamos;
New Mexico 87545;
USA;
Center for Metamaterials and Integrated Plasmonics;
Department of Electrical and Computer Engineering;
Duke University;
Durham;
North Carolina 27708;
USA;
MPA-11;
Los Alamos National Laboratory;
Los Alamos;
New Mexico 87545;
USA;
School of Electrical;
Computer and Energy Engineering;
Arizona State University;
Tempe;
Arizona 85287;
USA;
Chemistry;
Life;
and Earth Sciences Directorate;
Los Alamos National Laboratory;
Los Alamos;
New Mexico 87545;
USA;
Present address:Department of Chemical and Biomolecular Engineering;
Rice University;
Houston;
Texas 77005;
USA;