Quality factor and photon lifetime
The quality factor quantifies stored optical energy relative to energy loss.
Physical intuition
The quality factor quantifies stored optical energy relative to energy loss. This is the starting point for understanding how nanoscale optical geometry changes the states or dynamics accessible to light and matter.
Deep dive: how the mechanism works
A cavity leaks energy through radiation, absorption and coupling ports; a narrow linewidth indicates longer energy storage.
How the quantum phenomenon appears
A high-Q microresonator supports narrow optical resonances. To distinguish a genuinely quantum signal from a classical optical response, connect the device physics to a measurement such as photon correlations, interference visibility, energy-level structure or quantum-state tomography where appropriate.
Assumptions and limitations
Research and simulation exercise
Identify the tunable parameters, predict the observable from the stated model, and sweep one parameter while holding the others fixed. Compare against a simpler reference model, quantify loss and uncertainty, and state which observations would falsify the hypothesis.
Connect the ideas
See the chapter guide and further reading.