## Semiclassical analysis of two-level collective population inversion using photonic crystals in three-dimensional systems |

Optics Express, Vol. 20, Issue 15, pp. 17201-17213 (2012)

http://dx.doi.org/10.1364/OE.20.017201

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### Abstract

I theoretically demonstrate the population inversion of collective two-level atoms using photonic crystals in three-dimensional (3D) systems by self-consistent solution of the semiclassical Maxwell-Bloch equations. In the semiclassical theory, while electrons are quantized to ground and excited states, electromagnetic fields are treated classically. For control of spontaneous emission and steady-state population inversion of two-level atoms driven by an external laser which is generally considered impossible, large contrasts of electromagnetic local densities of states (EM LDOS’s) are necessary. When a large number of two-level atoms are coherently excited (Dicke model), the above properties can be recaptured by the Maxwell-Bloch equations based on the first-principle calculation. In this paper, I focus on the realistic 1D PC’s with finite structures perpendicular to periodic directions in 3D systems. In such structures, there appear pseudo photonic band gaps (PBG’s) in which light leaks into air regions, unlike complete PBG’s. Nevertheless, these pseudo PBG’s provide large contrasts of EM LDOS’s in the vicinity of the upper photonic band edges. I show that the realistic 1D PC’s in 3D systems enable the control of spontaneous emission and population inversion of collective two-level atoms driven by an external laser. This finding facilitates experimental fabrication and realization.

© 2012 OSA

**OCIS Codes**

(270.0270) Quantum optics : Quantum optics

(050.5298) Diffraction and gratings : Photonic crystals

**ToC Category:**

Quantum Optics

**History**

Original Manuscript: May 29, 2012

Revised Manuscript: June 15, 2012

Manuscript Accepted: June 25, 2012

Published: July 12, 2012

**Citation**

Hiroyuki Takeda, "Semiclassical analysis of two-level collective population inversion using photonic crystals in three-dimensional systems," Opt. Express **20**, 17201-17213 (2012)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-15-17201

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