Abstract
Multiphoton absorption processes have a nonlinear dependence on the amplitude of the incident optical field i.e. the number of photons. However, multiphoton absorption is generally weak and multiphoton events occur with extremely low probability. Consequently, it is extremely challenging to engineer quantum nonlinear devices that operate at the single photon level and the majority of quantum technologies have to rely on single photon interactions. Here, we demonstrate experimentally and theoretically that exploiting coherent absorption of N = 2 N00N states makes it possible to enhance the number of twophoton states that are absorbed. An absorbing metasurface placed inside a Sagnacstyle interferometer into which we inject an N = 2 N00N state, exhibits twophoton absorption with 40.5% efficiency, close to the theoretical maximum. This high probability of simultaneous absorption of two photons holds the promise for applications in fields that require
multiphoton upconversion but are hindered by high peak intensities, for example spectroscopic measurements of delicate biological samples and quantum photolithography.
multiphoton upconversion but are hindered by high peak intensities, for example spectroscopic measurements of delicate biological samples and quantum photolithography.
Original language  English 

Publication status  Published  11 Sep 2017 
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Coherent metamaterial absorption of twophoton states with 40% eciency.
Faccio, D. F. A. (Creator) & Lyons, A. (Creator), HeriotWatt University, 2017
DOI: 10.17861/93f161050fe0403985cd5d8058f641fd
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