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A simple and general strategy for generating frequency-anticorrelated photon pairs.

Zhang X, Xu C, Ren Z - Sci Rep (2016)

Bottom Line: To reduce the required flux, a promising solution is to use highly frequency-anticorrelated photon pairs, which are known to induce two-photon transitions much more efficiently.It is shown quantitatively that this strategy can generate highly frequency-anticorrelated photon pairs which can dramatically enhance two-photon excitation efficiency.We believe the proposed strategy can guide new designs for generating frequency-anticorrelated photon pairs.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210008, China.

ABSTRACT
Currently, two-photon excitation microscopy is the method of choice for imaging living cells within thick specimen. A remaining problem for this technique is the damage caused by the high photon flux in the excitation region. To reduce the required flux, a promising solution is to use highly frequency-anticorrelated photon pairs, which are known to induce two-photon transitions much more efficiently. It is still an open question what the best scheme is for generating such photon pairs. Here we propose one simple general strategy for this task. As an example, we show explicitly that this general strategy can be realized faithfully within the widely applicable coherently pumped Jaynes-Cummings model. It is shown quantitatively that this strategy can generate highly frequency-anticorrelated photon pairs which can dramatically enhance two-photon excitation efficiency. We believe the proposed strategy can guide new designs for generating frequency-anticorrelated photon pairs.

No MeSH data available.


Related in: MedlinePlus

Schematic depiction of the coherently pumped JC model.A photon cavity is formed by two high-quality mirrors facing each other. The photon mode supported by the cavity interacts coherently with the two-level system (the sphere in the middle) with a strength characterized by g. The two-level system is coherently pumped by a laser beam with a pumping strength characterized by Ω. The upper mirror is a high reflector while the lower mirror is slightly transmitting, which gives rise to the finite cavity decay rate κ. Note that this figure is intended to be a schematic depiction for all equivalent systems describable by the coherently pumped JC model (equation (1)). This model can be used to realize faithfully the proposed general strategy.
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f2: Schematic depiction of the coherently pumped JC model.A photon cavity is formed by two high-quality mirrors facing each other. The photon mode supported by the cavity interacts coherently with the two-level system (the sphere in the middle) with a strength characterized by g. The two-level system is coherently pumped by a laser beam with a pumping strength characterized by Ω. The upper mirror is a high reflector while the lower mirror is slightly transmitting, which gives rise to the finite cavity decay rate κ. Note that this figure is intended to be a schematic depiction for all equivalent systems describable by the coherently pumped JC model (equation (1)). This model can be used to realize faithfully the proposed general strategy.

Mentions: The JC model20 is the most important, most widely applicable and possibly the simplest model in the area known as cavity quantum electrodynamics (cavity QED)21222324252627. The proposed simple general strategy “” can be realized faithfully in the widely applicable coherently pumped JC model. A schematic depiction of the basic scenario of this model is given in Fig. 2. It describes a single-mode photon field interacting with a two-level system (TLS), which is pumped coherently by a laser. Note that in Fig. 2 a finite cavity decay characterized by the decay rate κ is also included. This decay arises from the coupling of the intra-cavity field with the extra-cavity photon modes and shall be crucial in generating the outgoing photon pairs. This model is described by the following Hamiltonian (written in the rotating frame of the pumping laser):


A simple and general strategy for generating frequency-anticorrelated photon pairs.

Zhang X, Xu C, Ren Z - Sci Rep (2016)

Schematic depiction of the coherently pumped JC model.A photon cavity is formed by two high-quality mirrors facing each other. The photon mode supported by the cavity interacts coherently with the two-level system (the sphere in the middle) with a strength characterized by g. The two-level system is coherently pumped by a laser beam with a pumping strength characterized by Ω. The upper mirror is a high reflector while the lower mirror is slightly transmitting, which gives rise to the finite cavity decay rate κ. Note that this figure is intended to be a schematic depiction for all equivalent systems describable by the coherently pumped JC model (equation (1)). This model can be used to realize faithfully the proposed general strategy.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4834487&req=5

f2: Schematic depiction of the coherently pumped JC model.A photon cavity is formed by two high-quality mirrors facing each other. The photon mode supported by the cavity interacts coherently with the two-level system (the sphere in the middle) with a strength characterized by g. The two-level system is coherently pumped by a laser beam with a pumping strength characterized by Ω. The upper mirror is a high reflector while the lower mirror is slightly transmitting, which gives rise to the finite cavity decay rate κ. Note that this figure is intended to be a schematic depiction for all equivalent systems describable by the coherently pumped JC model (equation (1)). This model can be used to realize faithfully the proposed general strategy.
Mentions: The JC model20 is the most important, most widely applicable and possibly the simplest model in the area known as cavity quantum electrodynamics (cavity QED)21222324252627. The proposed simple general strategy “” can be realized faithfully in the widely applicable coherently pumped JC model. A schematic depiction of the basic scenario of this model is given in Fig. 2. It describes a single-mode photon field interacting with a two-level system (TLS), which is pumped coherently by a laser. Note that in Fig. 2 a finite cavity decay characterized by the decay rate κ is also included. This decay arises from the coupling of the intra-cavity field with the extra-cavity photon modes and shall be crucial in generating the outgoing photon pairs. This model is described by the following Hamiltonian (written in the rotating frame of the pumping laser):

Bottom Line: To reduce the required flux, a promising solution is to use highly frequency-anticorrelated photon pairs, which are known to induce two-photon transitions much more efficiently.It is shown quantitatively that this strategy can generate highly frequency-anticorrelated photon pairs which can dramatically enhance two-photon excitation efficiency.We believe the proposed strategy can guide new designs for generating frequency-anticorrelated photon pairs.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210008, China.

ABSTRACT
Currently, two-photon excitation microscopy is the method of choice for imaging living cells within thick specimen. A remaining problem for this technique is the damage caused by the high photon flux in the excitation region. To reduce the required flux, a promising solution is to use highly frequency-anticorrelated photon pairs, which are known to induce two-photon transitions much more efficiently. It is still an open question what the best scheme is for generating such photon pairs. Here we propose one simple general strategy for this task. As an example, we show explicitly that this general strategy can be realized faithfully within the widely applicable coherently pumped Jaynes-Cummings model. It is shown quantitatively that this strategy can generate highly frequency-anticorrelated photon pairs which can dramatically enhance two-photon excitation efficiency. We believe the proposed strategy can guide new designs for generating frequency-anticorrelated photon pairs.

No MeSH data available.


Related in: MedlinePlus