What I do
"Curiosity in community" is the best environment for both rich learning and innovative research.
condensed matter physics, Optics and Photonics
Dr. Mark Siemens received a B.S. in Engineering Physics from the Colorado School of Mines in 2003 and did his Ph.D. research at JILA and the University of Colorado. After graduating in 2009, Dr. Siemens worked as an NRC postdoc at the National Institute of Standards and Technology (NIST) and JILA. In 2010, he moved to the University of Denver where he joined the Department of Physics and Astronomy as an Assistant Professor. He was promoted to Associate Professor in 2016 and was appointed Director of the Undergraduate Research Center in 2018. Dr. Siemens has two primary research interests: 1.) Using ultrashort laser pulses to measure electron transport in semiconductors for making better solar cells, and 2.) Studying topological effects in laser beams with orbital angular momentum.
- Ph.D., Physics, University of Colorado, 2009
- BS, Engineering Physics, Colorado School of Mines, 2003
- The Optical Society
- American Physical Society
The Siemens group has two primary research interests: ultrafast spectroscopy and topological optics.
We use ultrashort pulsed lasers to control and measure electron transport, primarily through multidimensional coherent spectroscopy. This allows us to observe and differentiate coherent and incoherent transport pathways in complex semiconductor materials such as quantum wells and thin films. We are currently studying perovskite thin films, which have shown great promise as a next-generation photovoltaic material without clear understanding of why they work so well - our goal is to clarify the basic transport physics in these materials to enable the fabrication of even higher conversion efficiency and lower cost solar cells.
We also study the generation, propagation, and measurement of light with phase singularities and orbital angular momentum (OAM). We are interested in high-purity generation and high-fidelity measurement of light's OAM for potential applications in communication and spectroscopy. We are studying emergent topological interactions in propagating optical beams.
- CAREER: Unlocking forbidden optical transitions in nanostructures using light with orbital angular momentum
- Collaborative Research: OAM photonics: sensing and imaging enabled by orbital angular momentum of light
- Collaborative: Ultrafast Phonon Spectroscopy for Lifetime Measurements of Phonons in 2-D Transitional Metal Dchalcogenides
- Quanitzed phonon dynamics for thermoelectrics
- Fulbright Scholar, Fulbright Scholar program, United States Department of State Bureau of Educational and Cultural Affairs
- Franklin Research Grant , American Philosophical Society
- NSF CAREER award, National Science Foundation
- Outstanding Junior Faculty, DU Division of Natural Sciences & Mathematics
- Doctoral New Investigator, American Chemical Society