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Optomechanics, the sensing of mechanical movement using optical modes, has seen great advancement in recent years and has been used for its high displacement sensitivity to couple to a variety of mechanical devices. Torsional devices have historically been used for measuring de Haas-van Alphen effect, shear modulus, superfluids, superconductors, the angular momentum of light, switching of magnetic states, and other applications. Combining these two together, a silicon microdisk coupled to a torsional resonator has been observed before to have sensitivities of 4 nrad Hz and 7 fm Hz. A cryogenic ultra-high vacuum (UHV) system holds the possibilities of analyzing these devices at 4 K in a much higher vacuum than has been studied before. We have retrofitted a former STM with a tapered optical fiber to couple light to a silicon microdisk. This “Photon STM” (P-STM) has the potential to not only couple to optical devices, but map the optical topography of a sample by using a modified tunnel current technique. This thesis shows how the P-STM was constructed and demonstrated its ability to couple to a 38 μm diameter optical disk and measured a nearby torsional resonator in high vacuum, with sensitivities down to 200 fm Hz and 80 nrad Hz.

Measuring Optomechanics with a Photon STM in the High Vacuum Environment