TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.21.21 TI - A Nanoscale Tractor Beam JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 21 IS - SP - 21 EP - PY - 2008/06/25/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.21.21 A1 - Gorder, Pam Frost ER -