Shaping the propagation of light in complex media

Abstract

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Controlling light propagation in multimode fibers for imaging, spectroscopy, and beyond

“…A whole class of further applications emerges, when broad-band light signals are considered, since MMFs conversely act as a mixer between the spatial and the spectral/temporal domain [25,26]. Although beam-shaping will not affect the overall power carried by individual wavelengths, it can manipulate their phase and polarization relations.…”

Generalized phase conjugation for incoherent light in complex media

“…The concept can be applied to different incoherent emissions, such as spontaneous Raman scattering [17,18], and a wide range of photoluminescence [45]. Furthermore, it enables the passive characterization of a transmission matrix, opening up the possibility to generalized light control using transmission-matrix-based operators [10]. We envision that the proposed approach will enable targeted light delivery through thick biological tissue, facilitating biomedical applications, such as optogenetic stimulation and phototherapy.…”

“…Delivering optical energy and transmitting information through complex media remains an important challenge in many fields of studies, including optical manipulation [1], deep-tissue imaging [2,3] and optogenetics [4,5]. In recent years, it has been shown that the coherent control of scattered light can manipulate spatial, spectral and temporal distributions of light in scattering media [6][7][8][9][10]. However, such capabilities are greatly limited without physical access inside a medium because the scattering response to target position is difficult to characterize.…”

High-Fidelity and High-Speed Wavefront Shaping through Complex Media via Sparsity-Constrained Optimization

“…The rapid progress in wavefront shaping in complex media can be partly attributed to the increasing availability and performance of spatial light modulation devices such as spatial light modulators (SLMs) and digital micromirror devices (DMDs), which compensate for the scattering process by generating conjugated light fields, also known as time reversal or optical phase conjugation [36][37][38]. For applications that require real-time speed and high-precision light manipulation, such as holographic optogenetics [39][40][41], live-tissue imaging [42], and holographic 3D printing [28], a high-speed wavefront shaping technique without compromising projection quality is in high demand.…”