  In this paper we discuss a technique for selectively loading a particle into
a magneto-gravitational trap using the sublimation of camphor to release
particles from a tungsten probe tip directly into the trapping region. This
sublimation-activated release (SAR) loading technique makes use of
micropositioners with tungsten probe tips, as well as the relatively fast rate
of sublimation of camphor at room temperature, to selectively load particles
having diameters ranging from $\SI{8}{\micro \meter}$ to $\SI{100}{\micro
\meter}$ or more. The advantages of this method include its ability to
selectively load unique particles or particles in limited supply, its low loss
compared to alternative techniques, the low speed of the particle when
released, and the versatility of its design which allows for loading into traps
with complex geometries. SAR is demonstrated here by loading a particle into a
magneto-gravitational trap, but the technique could also be applicable to other
levitated optomechanical systems.
