Purcell effect

The Purcell Effect , named after Edward Mills Purcell , states that the likelihood of spontaneous emission can be increased by placing the source in a resonator . The emission rate increases by the Purcell factor

${\displaystyle F_{P}={\frac {3}{4\pi ^{2}}}{\frac {Q}{V}}\ \left({\frac {\lambda }{n}}\right)^{3},}$

where the wavelength of the emitted radiation as well as the quality , the mode volume of the resonator and the refractive index in the respective medium are. The Purcell effect is particularly used in the construction of single photon sources. ${\displaystyle \lambda }$ ${\displaystyle Q}$ ${\displaystyle V}$ ${\displaystyle n}$

literature

• EM Purcell: B10. Spontaneous Emission Probabilities at Radio Frequencies . In: Physical Review . tape 69 , no. 11-12 , June 1946, pp. 681 , doi : 10.1103 / PhysRev.69.674.2 (Contribution to: Proceedings of the American Physical Society. Minutes of the meeting of New York State section at Hamilton, New York, APRIL 13, 1946 ).