Active wavefront shaping for controlling and improving multimode fiber sensor

Zhong, Tianting; Yu, Zhipeng; Li, Huanhao; Li, Zihao; Li, Hao‐Hong; Lai, Puxiang

doi:10.1142/s1793545819420070

Cited by 10 publications

(8 citation statements)

References 44 publications

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“…This drawback can be mitigated by elongating the depth of focus through wavefront engineering to PA illumination. , It would be challenging to image larger samples using the current scanning mechanism that moves the animal while maintaining the PA illumination and SPR detection. We plan to apply optical fibers for delivering both of the PA excitation light and SPR interrogation light, enabling to configure two flexibly motioned subsystems with reduced weight. Thus, a compact imaging probe, incorporating the objective, cavity, and SPR sensor, can be readily translated with a motorized scanner with the sample remaining stationary.…”

Section: Resultsmentioning

confidence: 99%

In Vivo Reflection-Mode Photoacoustic Microscopy Enhanced by Plasmonic Sensing with an Acoustic Cavity

et al. 2019

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Relying on high-sensitivity refractive index sensing and a highly constrained evanescent field of surface plasmon resonance (SPR), broadband photoacoustic (PA) pressure transients were measured using an SPR sensor instead of routinely used piezoelectric ultrasonic transducers. An acoustic cavity made from stainless steel and having a designed ellipsoidal inner surface redirected laser-induced PA waves from the PA excitation spot to the SPR sensor. By incorporating the SPR sensor with the acoustic cavity, we developed optical-resolution photoacoustic microscopy (OR-PAM) with multiple advantages, including reflection-mode signal capture, improved PA detection sensitivity, increased PA spectral bandwidth as broad as ∼98 MHz, and micrometer-scale lateral resolution. This allowed label-free volumetric PA imaging of vasculature in not only the thin ear but also the thick forelimb of living mice. With these combined advantages, our OR-PAM system potentially offers more opportunities for biomedical investigation, for example, when studying microcirculations in the eye and cortex.

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Section: Resultsmentioning

confidence: 99%

In Vivo Reflection-Mode Photoacoustic Microscopy Enhanced by Plasmonic Sensing with an Acoustic Cavity

et al. 2019

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“…The tunable multichannel EIT-like and Fano-like absorptions may be applied for designing of various biosensing devices, such as sensor,¯lter, modulator, optical tagging, thermal detecting, optical switching and all-optical diode. [46][47][48] Moreover, the structure with EIT-like and Fano-like absorption in visible and near-infrared regimes can potentially be extended to infrared and even terahertz spectrum for more applications in biosensing.…”

Section: Discussionmentioning

confidence: 99%

Tunable absorption characteristics in multilayered structures with graphene for biosensing

Jin

Zhou

Lai

2020

J. Innov. Opt. Health Sci.

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Graphene derivatives, possessing strong Raman scattering and near-infrared absorption intrinsically, have boosted many exciting biosensing applications. The tunability of the absorption characteristics, however, remains largely unexplored to date. Here, we proposed a multilayer configuration constructed by a graphene monolayer sandwiched between a buffer layer and one-dimensional photonic crystal (1DPC) to achieve tunable graphene absorption under total internal reflection (TIR). It is interesting that the unique optical properties of the buffer-graphene-1DPC multilayer structure, the electromagnetically induced transparency (EIT)-like and Fano-like absorptions, can be achieved with pre-determined resonance wavelengths, and furtherly be tuned by adjusting either the structure parameters or the incident angle of light. Theoretical analyses demonstrate that such EIT- and Fano-like absorptions are due to the interference of light in the multilayer structure and the complete transmission produced by the evanescent wave resonance in the configuration. The enhanced absorptions and the huge electrical field enhancement effect exhibit potentials for broad applications, such as photoacoustic imaging and Raman imaging.

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“…Such instability is also a major factor that impedes wavefront shaping-assisted MMF from wider applications, since the modulated optical field through the MMF will accordingly decorrelate. The decorrelation essentially indicates that the transmission matrix (TM) of the MMF is highly susceptible to perturbations, such as bent, twisting, or temperature change [16,17].…”

Section: Introductionmentioning

confidence: 99%

Adaptive optical focusing through perturbed scattering media with a dynamic mutation algorithm

Li¹,

Woo²,

Zhong³

et al. 2021

Photon. Res.

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Optical focusing and imaging through or inside scattering media, such multimode fiber and biological tissues, has significant impact in biomedicine yet considered challenging due to strong scattering nature of light. In the past decade, promising progress has been made in the field, largely benefiting from the invention of iterative optical wavefront shaping, with which deep-tissue high-resolution optical focusing and hence imaging becomes possible. Most of reported iterative algorithms can overcome small perturbations on the noise level but fail to effectively adapt beyond the noise level, e.g. sudden strong perturbations. Re-optimizations are usually needed for significant decorrelation to the medium since these algorithms heavily rely on the optimization performance in the previous iterations. Such ineffectiveness is probably due to the absence of a metric that can gauge the deviation of the instant wavefront from the optimum compensation based on the concurrently measured optical focusing. In this study, a square rule of binary-amplitude modulation, directly relating the measured focusing performance with the error in the optimized wavefront, is theoretically proved and experimentally validated. With this simple rule, it is feasible to quantify how many pixels on the spatial light modulator incorrectly modulate the wavefront for the instant status of the medium or the whole system. As an example of application, we propose a novel algorithm, dynamic mutation algorithm (DMA), which has high adaptability against perturbations by probing how far the optimization has gone toward the theoretically optimal performance. The diminished focus of scattered light can be effectively recovered when perturbations to the medium cause significant drop of the focusing performance, which no existing algorithms can achieve due to their inherent strong dependence on previous optimizations. With further improvement, the square rule and the new algorithm may boost or inspire many applications, such as high-resolution optical imaging and stimulation, in instable or dynamic scattering environments.

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Active wavefront shaping for controlling and improving multimode fiber sensor

Cited by 10 publications

References 44 publications

In Vivo Reflection-Mode Photoacoustic Microscopy Enhanced by Plasmonic Sensing with an Acoustic Cavity

In Vivo Reflection-Mode Photoacoustic Microscopy Enhanced by Plasmonic Sensing with an Acoustic Cavity

Tunable absorption characteristics in multilayered structures with graphene for biosensing

Adaptive optical focusing through perturbed scattering media with a dynamic mutation algorithm

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