About

Desmond Ang is an applied economist and assistant professor at the Harvard Kennedy School of Government. His research examines the causes and consequences of racial discrimination and has been published in leading journals including American Economic Review, American Political Science Review, and Quarterly Journal of Economics. He holds a Ph.D. in economics from the University of California, San Diego, and a B.A. from Dartmouth College.

Research topics

• Physics
• Optics
• Optoelectronics
• Materials science
• Quantum mechanics
• Nuclear physics
• Atomic physics

Selected publications

• Electrostatic focusing of cold and heavy molecules for the ACME electron EDM search

  New Journal of Physics · 2022 · 14 citations

  • Physics
  • Atomic physics
  • Optics

  Abstract The current best upper limit for electron electric dipole moment (EDM), | d e | < 1.1 × 10 −29 e cm (90% confidence), was set by the ACME Collaboration in 2018. The ACME experiment uses a spin-precession measurement in a cold beam of thorium monoxide (ThO) molecules to detect d e . An improvement in statistical uncertainty would be possible with more efficient use of molecules from the cryogenic buffer gas beam source. Here, we demonstrate electrostatic focusing of the ThO beam with a hexapole lens. This results in a factor of 16 enhancement in the molecular flux detectable downstream, in a beamline similar to that built for the next generation of ACME. We also demonstrate an upgraded rotational cooling scheme that increases the ground state population by 3.5 times compared to no cooling, consistent with expectations and a factor of 1.4 larger than previously in ACME. When combined with other demonstrated improvements, we project over an order of magnitude improvement in statistical sensitivity for the next generation ACME electron EDM search.

  PublisherOA PDFDOI

• Suppression of the optical crosstalk in a multi-channel silicon photomultiplier array

  Optics Express · 2021 · 21 citations

  • Optics
  • Optoelectronics
  • Materials science

  We propose and study a method of optical crosstalk suppression for silicon photomultipliers (SiPMs) using optical filters. We demonstrate that attaching absorptive visible bandpass filters to the SiPM can substantially reduce the optical crosstalk. Measurements suggest that the absorption of near infrared light is important to achieve this suppression. The proposed technique can be easily applied to suppress the optical crosstalk in SiPMs in cases where filtering near infrared light is compatible with the application.

  DOI

Frequent coauthors

• Xing Wu

  East China Normal University

  20 shared

• G. Gabrielse

  19 shared

• Cole Meisenhelder

  Harvard University

  18 shared

• Cristian D. Panda

  University of California, Berkeley

  16 shared

• David DeMille

  University of Chicago

  16 shared

• John M. Doyle

  16 shared

• Richard Brogan

  Golden Jubilee National Hospital

  13 shared

• Nicholas R. Hutzler

  California Institute of Technology

  10 shared

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