Md Navid Akbar, PhD’s Post

👀 Check this new article summary from #DynAMic member CNRS Here you will get to learn more about single-pixel transmission matrix recovery via two-photon fluorescence :   🛑 Problem: Imaging in depth in opaque materials has been a challenge for a long time. Recently, wavefront shaping has enabled significant advance for deep imaging. Nevertheless, most non-invasive wavefront shaping methods require cameras, lacking the sensitivity for deep imaging under weak optical signals, or only able to focus on a single "guidestar". 🤔 Methodology: We can retrieve the transmission matrix (TM) noninvasively using two-photon fluorescence exploiting a general single-pixel detection framework, allowing to achieve single-target focus on multiple guidestars spread beyond the memory effect range. In addition, if we assume memory effect correlations exist in the transmission matrix, we are able to significantly reduce the number of measurements needed.   ✅ Solution: We established a general framework and showed that the forward model is only solvable with non-linear fluorescence signals. In particular, we used a multiplexed phase retrieval scheme using gradient-descent-based algorithm to extract the TM. We demonstrated focusing on multiple fluorescing targets beyond the memory effect. To speed up the measurement process, we considered the memory effect which significantly decreases the amount of measurements needed.   Want to read the full article ? You can go there 👇 https://lnkd.in/eZUqTzXD   You would like to learn more about DynAMic project ? Check the link below 👇 https://lnkd.in/ewX5JkqV #Microscopy

A new technique to enhance superresolution imaging techniques with single-photon sources as probes.

Have you ever heard of angle-resolved cathodoluminescence (CL)? With this technique, you not only measure the light intensity, but also the directionality of the light! Angle-resolved CL is not the most well-known technique, but it is very useful in the field of photonics. But what does it mean to measure the directionality of light? Read it now in our blog post: https://bit.ly/3ESdcRn #Cathodoluminescence #Photonics

THz Lenses Understanding UV and IR optics is key for advanced optical applications. These optics are tailored for specific wavelength ranges, optimizing performance in fields like biomedical imaging and remote sensing. Explore their significance in modern technology! #opticalmirror #prism #PrecisionOptics #AdvancedPhotonicss https://buff.ly/3x5Hgn1

Check out our new review paper on nonlinear interferometers. The paper focuses on quantum imaging, its resolution, and holography techniques, but also contains other sensing techniques based on induced coherence.  I am thankful to Markus for letting me work on this project, which, although it was very demanding, was also a lot of fun 🤓. Many thanks to Enno Giese and Markus Gräfe. #quantumimaging #nonlinearinterferometer #inducedcoherence The link to the paper:

An absolutely fascinating image of a single neuron that illustrates the complexity of brain connectivity. Amazingly Detailed Images Reveal a Single Cubic Millimeter of Human Brain in 3D | ScienceAlert https://lnkd.in/eXMWPjQh A Browsable Petascale Reconstruction of the Human Cortex https://lnkd.in/eT5aXDZN

I am very happy to announce the publication of our latest article in Photonics, titled "Standardizing Laser Speckle Orthogonal Contrast Imaging: Achieving Reproducible Measurements across Instruments" by Xavier ORLIK, Elise COLIN, and Aurelien Plyer 🔍 For the first time to our knowledge, we demonstrate the reproducibility of measurements on microcirculation between two independent instruments following a simple calibration process, by using the measurement discrepancies between temporally calculated speckle contrast and the reference static speckle contrast measured spatially. 💡 The implications of this research are vast, offering the potential for reliable and reproducible dynamic measurements in various applications, by ensuring accuracy and consistency across different setups. #Photonics #Research #Innovation #LaserSpeckleImaging #ReproducibleMeasurements #ScientificBreakthrough #speckle #circulation #blood #dynamicspeckle https://lnkd.in/emMPbKrb

THz Lenses Understanding UV and IR optics is key for advanced optical applications. These optics are tailored for specific wavelength ranges, optimizing performance in fields like biomedical imaging and remote sensing. Explore their significance in modern technology! #opticalmirror #prism #PrecisionOptics #AdvancedPhotonicss https://buff.ly/3x5Hgn1

[Nouvelle #publication #p2s] Personal Income Performance Correlates with Brain Structural Network Modularity but Not Intelligence Quotient 👉This study aims to use diffusion tensor imaging (DTI) in conjunction with brain graph techniques to define brain structural connectivity and investigate its association with personal income (PI) in individuals of various ages and intelligence quotients (IQ). 👉🏻 Lien vers la publication : https://lnkd.in/eWifhaxS

A new study presents an analog photonic encoder that tackles the challenges of power consumption and data storage in high-speed image processing. The system employs a passive disordered photonic structure for low-power, low-latency image compression, achieving over 90% structural similarity in image reconstruction. This could enable ultra-high-resolution imaging systems to operate at unprecedented speeds. https://lnkd.in/g7N-BpxV #Photonics Figure 1 / Wang, X., Redding, B., Karl, N. et al. Integrated photonic encoder for low power and high-speed image processing. Nat Commun 15, 4510 (2024). https://lnkd.in/gWWWsJ85