Lock phase

A drawback of the MD-class BioCD is the microfabrication required to pattern gold spokes on the disc to set the quadrature condition. To remove the microfabrication, an alternative means to establish a quadrature condition uses adaptive optical mixers in the far field to establish and lock phase quadrature. In this case, the disc can be a high-reflectance antinode surface with protein patterned directly on the disc surface without any need for surface structuring. As the disc spins, the immobilized protein causes phase modulation that is detected in the quadrature condition set up by the adaptive mixer. 

I will focus here on the two basic effective Lagrangians developed for color superconductivity. More specifically the Lagrangian for the color flavor locked phase (CFL) of QCD at high chemical potential and the 2 flavor color superconductive effective Lagrangian. 

Adjust the lock-phase and check for 2H lock signal saturation. 

It is important to avoid lock instability due to either saturation or suspended particles, because instability interferes with magnet field regulation by the lock channel and, in severe cases, can result in loss of the lock signal altogether. When a stable lock level is achieved somewhere around midrange, the lock phase (see next subsection) should be maximized. Only an approximately maximum lock phase, however, is desired at this point, because the lock phase is dependent on the homogeneity of the magnetic field. 

Optimise Z and Z interactively, as described above. If this is the first pass through Z and Z, then adjust the lock phase for maximum lock level. 

Zou H, Zhang Q, Tan H, Wang K, Du R, Fu Q. Clay locked phase morphology in the PPS/PA66/clay blends during compounding in an internal mixer. Polymer 2006 47 6-11. 

---