TY - JOUR KW - pfc AU - L. Nugent-Glandorf AU - Thomas Perkins BT - Optics Letters DA - 2004-11 DO - 10.1364/OL.29.002611 PY - 2004 EP - 2611 T2 - Optics Letters TI - Measuring 0.1-nm motion in 1 ms in an optical microscope with differential back-focal-plane detection VL - 29 SN - 0146-9592 ER -