Plasmonic effect on quantum coherence and interference in metallic photonic crystals doped with quantum dots

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.063816· OSTI ID:21437959

Hatef, Ali; Singh, Mahi R ^[1]

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1. Department of Physics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6 A 3K7 (Canada)

We have studied the effect of plasma energy on the absorption coefficient of metallic photonic crystals doped with an ensemble of three-level quantum dots, which are interacting with each other via dipole-dipole interaction. The quantum dots are also interacting with coupled plasma-photon modes present in the system. A probe laser field is applied in order to study the absorption coefficient. We also consider the effect of quantum interference in our simulations, whereby two absorbed photons interfere with one another. Here the density matrix method has been used to calculate the steady-state and transient behavior of the absorption coefficient for the system. Two different field configurations are considered in our numerical simulations. In the first configuration, a probe field couples the ground state and two closely excited states. Absorption occurs due to transitions from the ground state to the two excited states. It is found that the position of the transparent peak moves when the plasma energy is changed. In other words, changing the plasma energy causes the system to switch between a transparent and an absorbing state. The strong coupling between plasmons and the quantum dots is responsible for this phenomenon. In the second configuration, the probe field couples with only one excited state, while a pump field couples to the other excited state. The transition between excited states is dipole forbidden. We observed that the peak in the absorption profile splits into two and also that the system exhibits gain with inversion due to the change in the plasma frequency, which is caused by quantum interference and coherence. These are interesting results and can be used make nanoscale plasma devices.

• OSTI ID: 21437959
• Journal Information: Physical Review. A, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevA.81.063816; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
COMPUTERIZED SIMULATION
CRYSTALS
DENSITY MATRIX
DIPOLES
DOPED MATERIALS
EXCITED STATES
INTERFERENCE
LANGMUIR FREQUENCY
PHOTONS
PLASMA
PLASMONS
QUANTUM DOTS
STEADY-STATE CONDITIONS
TRANSIENTS
BOSONS
ELEMENTARY PARTICLES
ENERGY LEVELS
MASSLESS PARTICLES
MATERIALS
MATRICES
MULTIPOLES
NANOSTRUCTURES
QUASI PARTICLES
SIMULATION
SORPTION