High-sensitivity Fluorescence-Detected Multidimensional Electronic Spectroscopy Through Continuous Pump-probe Delay Scan

TL;DR

This paper introduces a highly sensitive fluorescence-detected multidimensional electronic spectroscopy technique that achieves room temperature vibrational coherence mapping at significantly lower optical densities than traditional methods.

Contribution

The authors develop a fluorescence-detected multidimensional electronic spectrometer using a white-light continuum and continuous pump-probe delay scan, enhancing sensitivity and data collection speed.

Findings

Achieved room temperature two-dimensional coherence maps at optical densities 2-3 orders lower than conventional methods.

Demonstrated simultaneous collection of rephasing and non-rephasing signals using phase modulation and lock-in detection.

Showcased alternative fast data collection schemes with continuous pump-probe scanning.

Abstract

Background-free fluorescence detection in multidimensional electronic spectroscopy promises high sensitivity compared to conventional approaches. Here we explore the sensitivity limits of multidimensional electronic spectroscopy. We present a fluorescence-detected multidimensional electronic spectrometer based on a visible white-light continuum. As a demonstration of sensitivity, we report room temperature two-dimensional coherence maps of vibrational quantum coherences in a laser dye at optical densities ~2-3 orders of magnitude lower than conventional approaches. This high sensitivity is enabled by a combination of biased sampling along the optical coherence time axes and a rapid scan of the waiting time T dimension at each time step. A combination of acousto-optic phase modulation and phase-sensitive lock-in detection enables simultaneous collection of rephasing and non-rephasing signals and measurements of room temperature vibrational wavepackets even at the lowest ODs. Alternative faster data collection schemes, enabled by the flexibility of continuous pump-probe scanning approach, are also demonstrated.