Giant noise amplification in synchronously pumped optical parametric oscillators

D’Alessandro, Giampaolo; Laforet, C. Brent

doi:10.1364/ol.34.000614

Cited by 6 publications

(3 citation statements)

References 12 publications

(22 reference statements)

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“…Therefore, large surface fields in nanoparticles and large transient gain and excess noise in macroscopic unstable cavities and dissipative systems [10][11][12][13]h a v et h e same geometrical origin.…”

Section: Theorymentioning

confidence: 99%

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The geometrical nature of optical resonances: from a sphere to fused dimer nanoparticles

Hourahine¹,

Papoff²

2012

Meas. Sci. Technol.

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This version is available at https://strathprints.strath.ac.uk/42181/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractWe study the electromagnetic response of smooth gold nanoparticles with shapes varying from a single sphere to two ellipsoids joined smoothly at their vertices. We show that the plasmonic resonance visible in the extinction and absorption cross sections shifts to longer wavelengths and eventually disappears as the mid-plane waist of the composite particle becomes narrower. This process corresponds to an increase of the numbers of internal and scattering modes that are mainly confined to the surface and coupled to the incident field. These modes strongly affect the near field, and therefore are of great importance in surface spectroscopy, but are almost undetectable in the far field.

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Section: Theorymentioning

confidence: 99%

“…is defined as the Peterman factor [9] that gives the order of magnitude of transient gain and excess noise in unstable cavity modes. Therefore, large surface fields in nanoparticles and large transient gain and excess noise in macroscopic unstable cavities and dissipative systems [10][11][12][13] have the same geometrical origin.…”

Section: Theorymentioning

confidence: 99%

The geometrical nature of optical resonances: from a sphere to fused dimer nanoparticles

Hourahine¹,

Papoff²

2012

Meas. Sci. Technol.

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“…Another consequence of non-normality is that the response to an external modulation can be very large even far from resonance, a phenomenon known as pseudoresonance [6,7]. In optics, transient growth has been predicted and observed in systems with non orthogonal modes where it affects the level of spontaneous emission noise [8][9][10] and in optical parametric oscillators [11,12]. A similar effect has been recently predicted in optical cavities filled with Bose-Einstein condensates [13], where excess noise can degrade the condensate and it underpins the response of nanoparticles to an incident field [14].…”

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confidence: 99%

Rapid Coherent Optical Modulation of Atomic Momenta via Pseudoresonances

Papoff

Robb

2012

Phys. Rev. Lett.

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We show that modulation of an optical field injected into a cavity containing a dilute Bose-Einstein condensate is transformed into a modulation of the population of the atomic momentum states due to pseudoresonances of the resolvent which describes the linearized evolution of the atom-cavity system. This effect is related to the way the atomic momentum states and the cavity optical field are dynamically coupled. The results presented offer new possibilities for rapid modulation of atomic momentum state populations up to 3 orders of magnitude faster than modulation of magnetic trapping potentials.

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Giant subthreshold amplification in synchronously pumped optical parametric oscillators

D’Alessandro

Papoff

2009

Phys. Rev. A

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Synchronously pumped parametric oscillators have been shown to have subthreshold giant amplification of such a magnitude that a macroscopic, entirely noise-driven, signal is present at output even when the device is below threshold. In this paper we quantify the magnitude of the amplification factor in terms of some key device parameters. We use non-normal operator theory to find the noise amplification factor (Kreiss constant) and show that the signal amplitude is proportional to it. We also determine that the noise sensitivity depends in a nontrivial way on the group velocity of the three fields

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Giant noise amplification in synchronously pumped optical parametric oscillators

Abstract: We show numerically that a synchronously pumped optical parametric oscillator can show giant noise amplification of the order of 10(9). We use pseudospectra to identify the parameter region for giant noise amplification and to estimate its magnitude.

Cited by 6 publications

References 12 publications

The geometrical nature of optical resonances: from a sphere to fused dimer nanoparticles

The geometrical nature of optical resonances: from a sphere to fused dimer nanoparticles

Rapid Coherent Optical Modulation of Atomic Momenta via Pseudoresonances

Giant subthreshold amplification in synchronously pumped optical parametric oscillators

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