Welcome to the Arnold group homepage

Prof. Craig B. Arnold and his research group focus on materials processing and fabrication, with applications in energy, optoelelectronics, sensing and nanotechnology.

News and recent publications

  • Effect of disorder on two-photon absorption in amorphous semiconductors

    J. I. Preimsberger, S.Y. Kang, and C.B. Arnold, Joule (2020) provides a unifying scheme to quantify the performance of different Piezoelectrochemical (PEC) systems, in hopes that these metrics will enable the design of better-quality harvesters. In specific, PEC harvesters are promising low-energy mechanical harvesters which can harvest lower mechanical frequencies at higher theoretical energy densities than other mechanical harvesters.

  • Variable optical elements for fast focus control

    S.Y. Kang, M. Duocastella, and C.B. Arnold, Nat. Photonics (2020) discusses recent developments in the emerging field of high-speed variable-z-focus optical elements, which are driving important innovations in advanced imaging and materials processing applications. Three state-of-the-art key optical technologies that enable fast z-focus modulation are reviewed, along with a discussion of the implications of the new developments in variable optical elements and their impact on technologically relevant applications.

  • Optimization of ultrafast axial scanning parameters for efficient pulsed laser micro-machining

    X. Du, S.Y. Kang, and C.B. Arnold, J. Mat. Proc. Tech, (2020) studies an ultrafast axial scanning technique that asynchronously distributes laser pulses along the axial direction. With axial scanning, multi-pass groove machining with axial scanning on silicon as well as femtosecond laser cutting of battery separators exhibit an extended effective machining range and an improved machining efficiency for both focused and defocused surfaces.

  • Effect of disorder on two-photon absorption in amorphous semiconductors

    N. S. Dutta, N. K. Noel, and C. B. Arnold, J. Phys. Chem. Lett. (2020) employs cryo-electron microscopy to show, for the first time, that colloids in prototypical methylammonium lead triiodide perovskite precursor inks are crystalline. These results demonstrate a novel method to investigate precursor inks and shed new light on perovskite solution processing.

  • Effect of disorder on two-photon absorption in amorphous semiconductors

    N. S. Dutta, J. M. P. Almeida, C. R. Mendonça, and C. B. Arnold, Optics Letters (2020) characterizes the two-photon absorption (2PA) spectra of solution-processed chalcogenide glass films using femtosecond Z-scan. The paper explains differences in the samples' 2PA coefficients as a consequence of differing levels of atomic bonding disorder in the glass structures. This result is highly general, shedding light on the relationship between disorder and 2PA for any amorphous semiconductor.

  • Princeton uses neutrons to squeeze possibilities for piezoelectrochemical self-charging technologies.

    Postdoctoral researcher SeungYeon (Sally) Kang and graduate student Juliane Preimesberger used the VULCAN diffractometer at ORNL’s Spallation Neutron Source (SNS) to explore new approaches to energy storage technologies. The story is featured on ORNL's website.

Craig Arnold holding a TAG lens

Announcements

  • Graduate student Emre Turkoz has sucessfully defended his thesis. Congratulations Dr. Turkoz!
  • Undergraduate student Anushka Dasgupta has won NSF fellowship for her graduate studies. Congratulations Anushka!
  • Thomas (Tommy) Metke has joined our group as a first-year graduate student! Welcome Tommy!

Talks and Conferences

  • APS DFD 2018: Atlanta, Georgia (November 18-20, 2018). Abstract submission deadline: August 1st, 2018
  • ECS and SMEQ Joint International Meeting: Cancun, Mexico (September 30 – October 4, 2018).