Publications

Displaying 1 - 10 of 10

Phase-sensitive pump-probe measurement of the complex nonlinear susceptibility of silicon across the direct band edge

September 16, 2024

Author(s)

Chad Cruz, John C. Stephenson, Jared Wahlstrand

The nonlinear response of materials, an increasingly important aspect of light-matter interaction, can be challenging to measure in highly absorbing materials. Here, we introduce an interferometric technique that enables a direct measurement of the nonline

Non-resonant phase sensitive approach for time resolved microwave conductivity in photoactive thin films

February 7, 2024

Author(s)

Jasleen K Bindra, Pragya Shrestha, Sebastian Engmann, Chad Cruz, David Gundlach, Emily Bittle, Jason Campbell

Time-resolved microwave conductivity (TRMC) is a contactless technique utilized for the investigation of carrier density, transport properties, trapping phenomena, and recombination parameters in charge transport materials. Traditional TRMC methods rely on

Pump-probe phase spectroscopy with submilliradian sensitivity and nanosecond time delay using Michelson interferometers

April 17, 2023

Author(s)

Chad Cruz, John C. Stephenson, Sebastian Engmann, Emily Bittle, Jared Wahlstrand

We describe an experimental scheme for sensitive pump-probe spectral interferometry measurements at long time delays using two Michelson interferometers. It has practical advantages over the Sagnac interferometer method typically used when long time delays

Two-beam nonlinearity in indium tin oxide in the continuous wave limit

March 15, 2023

Author(s)

Jared Wahlstrand, Chad Cruz

Indium tin oxide (ITO) is an example of a material with a greatly enhanced optical nonlinearity for wavelengths at which the dielectric permittivity is near zero. Its enormous nonlinearity may enable compact photonic devices. All-optical devices involve

Resolving Complex Photoconductivity of Perovskite and Organic Semiconductor Films Using Phase-Sensitive Microwave Interferometry

March 2, 2023

Author(s)

Jasleen Bindra, Pragya Shrestha, Sebastian Engmann, Chad Cruz, Lea Nienhaus, Emily Bittle, Jason Campbell

Complex transient photoconductivity (Δσ) contains rich fingerprints of charge recombination dynamics in photoactive films. However, a direct measure of both real (Δσ′) and imaginary (Δσ″) components has proven difficult using conventional cavity-based time

Using temperature dependent fluorescence to evaluate singlet fission pathways in tetracene single crystals

December 21, 2020

Author(s)

Chad D. Cruz, Eric L. Chronister, Christopher Bardeen

The temperature dependent fluorescence spectrum, decay rate and spin quantum beats are examined in single tetracene crystals to gain insight into the mechanism of singlet fission. Over the temperature range 250-500 K, the vibronic lineshape of the emission

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