Hybrid Optical Tweezer–CPA Systems for Real-Time, High-Resolution Nonlinear Spectroscopy of Single Molecules

While table-top OPCPA systems have reached remarkable performance (Vaupel et al., 2013; Baudisch, 2017), and optical tweezers enable single-molecule manipulation, these technologies are rarely integrated. This research proposes a hybrid system in which a single molecule or nanoparticle is optically trapped, then interrogated by synchronized ultrafast pulses from a table-top OPCPA. This would enable, for the first time, direct observation of ultrafast nonlinear optical responses (e.g., high-harmonic generation, multiphoton absorption) from a single, trapped entity. Such real-time, high-resolution measurements could revolutionize our understanding of molecular dynamics, energy transfer, or photochemical reactions at the ultimate limit of spatial and temporal resolution. The novelty lies in the real-time feedback between trapping and nonlinear probing—something not discussed in the current reviews or experimental reports.

References:

1. High power, high intensity few-cycle pulses in the mid-IR for strong-field experiments. M. Baudisch (2017).
2. Concepts, performance review, and prospects of table-top, few-cycle optical parametric chirped-pulse amplification. A. Vaupel, N. Bodnar, B. Webb, L. Shah, M. Richardson (2013).