According to Anderson, the most profound and interesting problem in condensed matter physics is the glass transition. Indeed, glassy materials are ubiquitous in nature, and discussions of the glass transition involve many areas of physics. Despite intense interest in the dynamic slowing down that accompanies glass formation, a complete microscopic theory does not yet exist. Recently, the supposed existence of a length scale ξ for cooperative rearrangement has generated considerable interest in an alternative approach: the study of confined glasses. The correlation length scales emerging in these systems appear to be much larger than molecular sizes, which intrigues the community. We propose to address the problem of confined glass transition on a silica nanoparticle isolated from its environment using optical trapping in vacuum. The proposed method involves significantly modifying/improving an experimental system [1,2,3] whose basis has already been developed at LOMA for other fields of application. The originality of our new device is that it will enable independent determination of the size, refractive indices (real and imaginary) and temperature of a glass former nanoparticle optically trapped at a wavelength of 1064 nm [4,5]. The addition of an extra CO2 laser will enable us to finely control the temperature of the nanoparticle whose position is resolved in 3D using ultra fast interferometric detection [1,5].