Year: 2025
Type: article
Abstract: Two-dimensional terahertz spectroscopy (2DTS) is a low-frequency analog of two-dimensional optical spectroscopy that is rapidly maturing as a probe of a wide variety of condensed matter systems. However, a persistent problem with 2DTS is the long experimental acquisition times, which prevent its broader adoption. A potential solution, requiring no increase in experimental complexity, is signal reconstruction via compressive sensing. In this work, we apply the sparse exponential mode analysis (SEMA) technique to 2DTS of a cuprate superconductor. We benchmark the performance of the algorithm in reconstructing terahertz nonlinearities and find that SEMA reproduces the asymmetric photon echo line shapes at sampling rates as low as 10%, reaching the reconstruction noise floor at sampling rates beyond 20%–30%. The success of SEMA in reproducing such subtle, asymmetric line shapes confirms compressive sensing as a general method to accelerate 2DTS and multidimensional spectroscopies more broadly.
Source: APL Photonics
DOI: 10.1063/5.0276901
Authors: Z. Wang, H. Da, A. S. Disa, T. Pullerits, A. Liu, F. Schlawin
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,750
Awards: G1230266125, Quantum-inspired 2D Spectroscopy to Detect Hidden Quantum Mechanical Effects in Photosynthetic Proteins, Dephasing for Good: Optimal Decoherence for Efficient Light Harvesting and Sensing, G2034111186, EXC 2056: CUI: Advanced Imaging of Matter, G440953257, G5112088614, G5631081224, G5765906131, G6965541988, G7849337242
OpenAlex ID: W4414112113