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At the chemical level, diamonds are no more than carbon atoms aligned in a 3D crystal lattice. Even a diamond that looks flawless contains defects that can absorb or emit light. Small defects in diamonds called nitrogen-vacancy (NV) centers hold electron spins that can be manipulated at room temperature. Each NV center emits light that can provide information about the spin’s quantum state.
Collecting light from deeply embedded NV centers usually requires a bulky optical microscope in a highly controlled laboratory environment. Now, a research group at the University of Pennsylvania has designed a specialized metalens that circumvents the need for a large, expensive microscope.
By finding a certain kind of defect inside a…READ MORE