FIGURE 2. Functional micro-oscillator system, in which not only the spring but also the cubic anchor and the bead were produced using our two-photon absorption system.
From the following article:
Finer features for functional microdevices
Satoshi Kawata, Hong-Bo Sun, Tomokazu Tanaka and Kenji Takada
Nature 412, 697-698(16 August 2001)
doi:10.1038/35089130
The oscillator was kept in ethanol so that the buoyancy would balance gravity and eliminate bead– substrate friction. a, b, The spring in its original (a) and extended (b) states. Scale bars, 2 
m. c, Restoring curve of the damping oscillation; inset, diagram showing driving of the oscillator by using laser trapping.
