Abstract
In the field of clinical biology, imaging biological tissues play a crucial role in understanding the nature of structural and physiological changes in their content. Traditionally, for physiological and morphological studies of infected tissues, two-dimensional surface imaging of tissue sections was the standard. However, in many situations, 3D imaging of an entire tissue region becomes mandatory for a better understanding of the condition. This requires an imaging modality that can image deep inside the tissues with better resolution. But animal tissues are notorious for scattering visible light thus making it difficult to see any anomalies beyond 100 μm depth. To decrease the scattering by the tissue, IR light can be used. But according to Abbe’s law, the resolution of a microscope system is inversely proportional to the wavelength of light used. So, as two-photon excitation uses approximately twice the one-photon wavelength, the resolution becomes approximately half of the single photon. Moreover, as we try to observe deeper, scattering makes it difficult to cope with the decrease in the contrast between the object of interest and the unwanted part of the tissue. In this chapter, we will discuss one recently developed technique called Saturation Excitation (SAX) microscopy to achieve improved resolution and background-free images from depths of animal tissues using nonlinear plasmonic nanoparticle scattering as markers. Herein, we will discuss the working principle of the SAX technique and review its potential in imaging as deep as 400 μm with improved resolution and background-free contrast.
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Deka, G., Deka, B., Nishida, K., Fujita, K., Chu, SW. (2022). Deep Tissue High-resolution and Background-free Imaging with Plasmonic SAX Microscopy. In: Biswas, R., Mazumder, N. (eds) Recent Advances in Plasmonic Probes. Lecture Notes in Nanoscale Science and Technology, vol 33. Springer, Cham. https://doi.org/10.1007/978-3-030-99491-4_16
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