An implantable, ultra-narrow photonic probe has been developed that is able to deliver light deep within brain tissues. Current methods, which project spatially patterned light via free-space optics, excite neurons within superficial layers of the cortex. Light scattering and absorption in neural tissue causes the light penetration to be extremely short, making it impossible to probe brain regions deeper than about 2 mm using free-space optical methods. The minimally invasive probe uses a combination of nanophotonics and microelectromechanical systems (MEMS) technology. 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