Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.193902
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Funding
- National Science Foundation (NSF) [PHY-0969996]
- Defense Advanced Research Projects Agency (DARPA)
- Division Of Physics
- Direct For Mathematical & Physical Scien [0969996] Funding Source: National Science Foundation
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We demonstrate 25% all-optical modulation with <20 photons, i.e., a few attojoules of energy, using nondegenerate two-photon absorption in rubidium atoms confined to a hollow-core photonic band-gap fiber. An attenuation of up to 3 dB is induced on an optical field with a switching energy density of less than one photon per (lambda(2)/2 pi). We show that the temporal response of the system is determined by the 5-ns transit time of the atoms across the optical mode of the fiber, which results in a modulation bandwidth up to 50 MHz.
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