Figure 1: Structure of the spin-cavity unit. | Scientific Reports

Figure 1: Structure of the spin-cavity unit.

From: Photonic transistor and router using a single quantum-dot-confined spin in a single-sided optical microcavity

Figure 1

(a) A charged quantum dot is embedded in a single-sided pillar microcavity with one end mirror partially reflective and another end mirror 100% reflective allowing unit cavity reflectance when the cavity side leakage is neglected. The circular pillar cross-section supports circularly polarized light. (b) Optical transitions in a negatively-charged quantum dot follow spin selection rules: a photon in the |L〉 state couples to the transition |↑〉 ↔ |↑↓⇑〉 only, whereas a photon in the |R〉 state couples to the transition |↓〉 ↔ |↓↑⇓〉 only due to the conservation of angular momentum and the Pauli exclusion principle.

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