title: NanoPen: dynamic, low-power, and light-actuated patterning of nanoparticles.
abstract: We introduce NanoPen, a novel technique for low optical power intensity, flexible, real-time reconfigurable, and large-scale light-actuated patterning of single or multiple nanoparticles, such as metallic spherical nanocrystals, and one-dimensional nanostructures, such as carbon nanotubes. NanoPen is capable of dynamically patterning nanoparticles over an area of thousands of square micrometers with light intensities <10 W/cm(2) (using a commercial projector) within seconds. Various arbitrary nanoparticle patterns and arrays (including a 10 x 10 array covering a 0.025 mm(2) area) are demonstrated using this capability. One application of NanoPen is presented through the creation of surface-enhanced Raman spectroscopy hot-spots by patterning gold nanoparticles of 90 nm diameter with enhancement factors exceeding 10(7) and picomolar concentration sensitivities.
authors: Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USA.
authors: Arash
authors: A
authors: Jamshidi
authors: Steven L
authors: SL
authors: Neale
authors: Kyoungsik
authors: K
authors: Yu
authors: Peter J
authors: PJ
authors: Pauzauskie
authors: Peter James
authors: PJ
authors: Schuck
authors: Justin K
authors: JK
authors: Valley
authors: Hsan-Yin
authors: HY
authors: Hsu
authors: Aaron T
authors: AT
authors: Ohta
authors: Ming C
authors: MC
authors: Wu