Vibrational Imaging Improvements Enhance Sample Visualization

Boston University researchers have published two papers detailing techniques they have developed to make microscopes better at seeing tiny sample details without needing special dyes. Their research, published in Nature Communications and Science Advances, could help scientists better visualize and understand their samples in an easier manner, and with more accuracy.

The team’s research addresses a fundamental challenge in vibrational imaging, aiming to make it as sensitive as fluorescence imaging for visualizing target molecules at extremely low concentrations without the use of dyes. The team deployed photothermal microscopy to detect chemical bonds in specimens, introducing a new class of chemical imaging toolbox termed Vibrational Photothermal Microscopy (VIP microscopy). One paper presented a wide-field mid-infrared photothermal microscope for visualizing the chemical content of a viral particle, while the other introduced a novel vibrational photothermal microscope based on the stimulated Raman process.

The research identified limitations, such as weak non-Raman background caused by absorption in SRP microscopy. The team is actively working on a novel approach to address this limitation. The complementary nature of the Wide-Field Mid-Infrared Photothermal (WIDE-MIP) method and the SRP method suggests a synergy that can be harnessed for more comprehensive chemical imaging.

The papers collectively propose a new class of chemical microscopy, VIP microscopy, offering a highly sensitive method to probe specific chemical bonds without the need for dye labeling. This opens up exciting possibilities for future microscopy research, promising significant advancements in the field of life science and material science.