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26 April 2016 Activation of cells using femtosecond laser beam (Conference Presentation)
Subrata Batabyal, Sarmishtha Satpathy, Young-tae Kim, Samarendra K. Mohanty
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Proceedings Volume 9690, Clinical and Translational Neurophotonics; Neural Imaging and Sensing; and Optogenetics and Optical Manipulation; 969027 (2016) https://doi.org/10.1117/12.2216400
Event: SPIE BiOS, 2016, San Francisco, California, United States
Abstract
Study of communication in cellular systems requires precise activation of targeted cell(s) in the network. In contrast to chemical, electrical, thermal, mechanical stimulation, optical stimulation is non-invasive and is better suited for stimulation of targeted cells. As compared to visible lasers, the near infrared (NIR) microsecond/nanosecond pulsed laser beams are being used as preferred stimulation tool as they provide higher penetration depth in tissues. Femotosecond (FS) laser beams in NIR are also being used for direct and indirect (i.e. via two-photon optogenetics) stimulation of cells. Here, we present a comparative evaluation of efficacy of NIR FS laser beam for direct (no optogenetic sensitization) and 2ph optogenetic stimulation of cells. Further, for the first time, we demonstrate the use of blue (~450 nm, obtained by second harmonic generation) FS laser beam for stimulation of cells with and without Channelrhodopisn-2 (ChR2) expression. Comparative analysis of photocurrent generated by blue FS laser beam and continuous wave blue light for optogenetics stimulation of ChR2 transfected HEK cells will be presented. The use of ultrafast laser micro-beam for focal, non-contact, and repeated stimulation of single cells in a cellular circuitry allowed us to study the communication between different cell types.
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Subrata Batabyal, Sarmishtha Satpathy, Young-tae Kim, and Samarendra K. Mohanty "Activation of cells using femtosecond laser beam (Conference Presentation)", Proc. SPIE 9690, Clinical and Translational Neurophotonics; Neural Imaging and Sensing; and Optogenetics and Optical Manipulation, 969027 (26 April 2016); https://doi.org/10.1117/12.2216400
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KEYWORDS
Femtosecond phenomena
Optogenetics
Near infrared
Telecommunications
Laser therapeutics
Pulsed laser operation
Thermography
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