Finite-difference time-domain simulation of thermal noise in open cavities
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208-3112 (United States)
- Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208-3112 (United States)
- Department of Physics, Peking University, Beijing 100871 (China)
A numerical model based on the finite-difference time-domain (FDTD) method is developed to simulate thermal noise in open cavities owing to output coupling. The absorbing boundary of the FDTD grid is treated as a blackbody, whose thermal radiation penetrates the cavity in the grid. The calculated amount of thermal noise in a one-dimensional dielectric cavity recovers the standard result of the quantum Langevin equation in the Markovian regime. Our FDTD simulation also demonstrates that in the non-Markovian regime the buildup of the intracavity noise field depends on the ratio of the cavity photon lifetime to the coherence time of thermal radiation. The advantage of our numerical method is that the thermal noise is introduced in the time domain without prior knowledge of cavity modes.
- OSTI ID:
- 21140557
- Journal Information:
- Physical Review. A, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevA.77.023810; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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