Active isotropic slabs: conditions for amplified reflection

Perez, Liliana I.; Matteo, C.L.; Etcheverry, J. I.; Duplaá, María Celeste

doi:10.1088/2040-8978/14/12/125711

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…The reflection gain of the slab arrangement (12) contrasts with the analogous result for the interface of two semi-infinite media, where the second one is active. There R ≤ 1 in all cases [14,15]. An infinitely thick inverted medium produces zero gain in reflection, while a thin, inverted medium can produce large R.…”

Section: Slabmentioning

confidence: 91%

Impedance matching of inverted conductors: Two-dimensional beam splitters with divergent gain

Mecklenburg¹,

Regan²

2015

Phys. Rev. A

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A thin conducting sheet -graphene, for example -transmits, absorbs, and reflects radiation. A sheet that is very thin, even vanishingly so, can still produce 50% absorption at normal incidence if it has conductivity corresponding to half the impedance of free space. We find that, regardless of the sheet conductivity, there exists a combination of polarization and angle of incidence that achieves this impedance half-matching condition. If the conducting medium can be inverted, the conductivity is formally negative and the sheet amplifies the incident radiation. To the extent that a negative half-match in a thin sheet can be maintained, enormous single-pass gain in both transmission and reflection is possible. Known semiconductors (e.g., gallium nitride) have the optical properties necessary to give large amplification in a structure that is, remarkably, both thin and nonresonant.

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Section: Slabmentioning

confidence: 91%

Impedance matching of inverted conductors: Two-dimensional beam splitters with divergent gain

Mecklenburg¹,

Regan²

2015

Phys. Rev. A

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“…Previous results for plane waves show that there are certain critical configurations (in terms of slab thickness, incidence angle or relative refractive index) which require a very careful analytical solution. During the last years we undertook the study, later extended to include slabs, of the influence of gain in the reflection and transmission of plane waves in interfaces between semi-infinite media where at least one of the materials has these properties [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Propagation of Gaussian beams through active layers

et al. 2013

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Knowledge of propagation, transmission and reflection properties of space-and time-limited beams is relevant to the classical description of electromagnetic field modes in laser and other optoelectronic devices. For many reasons, Gaussian beams have been the most widely studied; for instance, they correspond to the fundamental mode in cylindrical or rectangular resonators, and they are often desirable at the output of amplifiers. To describe the behavior of beams with a Gaussian amplitude profile, the usual method consists of making an approximation in Maxwell equations, such that the solution of the approximate equations is a Gaussian beam. In this work we propose a different method to study Gaussian beams in active media, describing the beam by a continuous spectrum (spatial or temporal) of plane waves. We consider active media far from saturation, i.e. the gain is independent of the electric field amplitude. As a first step in the study of propagation, transmission and reflection of pulses through thin layers of active media, we analyze the properties of the transmitted beam in the case of a thin slab with gain between two isotropic transparent semi-infinite media, assuming normal incidence of a two-dimensional, space-or time-limited gaussian beam.

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Optical transmission singularities in light propagation through double active barrier structure

2018

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Propagation of the electromagnetic wave through a system with complex permittivity is investigated. The system consists of two media, one is passive and surrounds the two barrier slabs made out of the second material with complex dielectric constant. Expression for transmission probability is obtained along with equation which allows calculation of the resonant frequency. Analytical expressions for reflection and absorption probabilities are acquired as well. It will be shown, if the frequency is given, that the transmission probability (along with reflection and absorption probabilities) approaches infinity for one particular value of the dielectric constant with negative imaginary part, which is used to describe active media. Furthermore, conditions for appearance of these transmission singularities are obtained.

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Active isotropic slabs: conditions for amplified reflection

Cited by 3 publications

References 15 publications

Impedance matching of inverted conductors: Two-dimensional beam splitters with divergent gain

Impedance matching of inverted conductors: Two-dimensional beam splitters with divergent gain

Propagation of Gaussian beams through active layers

Optical transmission singularities in light propagation through double active barrier structure

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