Theory of optical bistability in a non-linear quasi-waveguide

Liao, Jun; Zhang, X.J.; Xu, Fei; Fan, Xi-Zhi; Wang, Hui-Tian; Ming, Nai‐Ben

doi:10.1007/s00340-002-1054-x

Cited by 7 publications

(5 citation statements)

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“…To get useful analytical results retaining the main qualitative features of the nonlinear response of our systems we discuss ͑employing a meanfield approach and standard multibeam interference analysis 16,17 ͒ the simplified FPM. The model consists of the MQW positioned between the coupling mirror ͑at z =0͒ and the totally reflecting back mirror ͑at z = L MC ͒.…”

Section: B Simplified Model: Multibeam Interference Analysismentioning

confidence: 99%

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Microcavity effect on the nonlinear intersubband response of multiple-quantum-well structures: The strong-coupling-regime

Załużny

Nalewajko

2010

Journal of Applied Physics

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We theoretically discuss the nonlinear intersubband response of multiple-quantum-well structures embedded in microcavities with plane-wave approximation. We employ a semiclassical approach based on the transfer matrix formalism and the so-called sheet model. The linear absorptive losses are taken into account. It is shown that in the strong-coupling-regime the saturation effect leads to the evolution of the absorption spectra from a pair of simple harmonic oscillators to highly anharmonic ones. The usefulness of the simplified analytical approach, based on a standard multibeam interference analysis and the “mean-field” approximation is also demonstrated.

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Section: B Simplified Model: Multibeam Interference Analysismentioning

confidence: 99%

“…15 To get a better insight into the physics of the above mentioned effect we also present a simplified analytical approach based on a Fabry-Perot model ͑FPM͒ and the so-called "mean-field" approximation. 16,17 …”

Section: Introductionmentioning

confidence: 98%

Microcavity effect on the nonlinear intersubband response of multiple-quantum-well structures: The strong-coupling-regime

Załużny

Nalewajko

2010

Journal of Applied Physics

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“…In an optical system/structure, if the output fields were a nonlinearly dependent function with an oscillating form of the related physical parameter, it would exhibit optical bistable behavior in the presence of positive feedback under suitable conditions. Optical bistability has been predicted and experimentally realized in various settings, including a Fabry-Perot resonator filled with a nonlinear material, layered periodic structures and nonlinear couplers with external feed back mechanisms 4) . Yuri Mitnick et al have discovered optical bistability in cavities with EDFA, which can be explained by the bidirectional pump-beam interference 5) .…”

Section: Introductionmentioning

confidence: 99%

Optical bistability of waveguide consisting of poly(3-hexylthiophene)/polymethylmethacrylate composite film

Ochiai

Mototani

Ramajothi

et al. 2008

Linear and Nonlinear Optics of Organic Materials VIII

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In the optical materials, the remarkable change of refractive index due to optical intensity is important for making photo-devices such as optical switching, memory and logic circuits. The optical waveguide consisted of poly (3-hexylthiophene)/polymethylmethacrylate (P3HT/PMMA) composite film and a prism was fabricated to find out its optical bistable characteristics. The refractive index of P3HT/PMMA composite film measured by ellipsometry was 1.48.Moreover, the refractive indexes of the atmosphere and the prism were 1.00 and 1.52 respectively. Therefore, the fabricated waveguide satisfied the condition of the quasi-waveguide. For improving the nonlinear optical characteristic of the composite film, P3HT/PMMA composite film was exposed to organic gas for 25 hrs. As the laser light source, Nd:YAG laser (wavelength: 1064 nm, pulse width: 5 ns, repetition frequency: 10 Hz) was adopted for optical bistability and third-harmonic intensity measurement. The input light intensity dependences of the optical bistable characteristics of the quasi-waveguide consisting of the P3HT/PMMA composite thin film, which was exposed to organic gas for 25 hrs were investigated. The measured optical bistability displaced excellent stability and hysteresis characteristics. It suggests that the composite film exposed to organic gas has larger grain size, better molecular orientation, homogeneous bulk and smooth surface than that of before organic gas treatment.

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“…In large-capacity communication networks, optical-optical conversion devices are required in order to increase the information transmission speed. The optical bistability effect has attracted much interest because it provides a basis for various optical devices, such as optical memories, and optical switches [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Optical bistability of polythiophene derivative/polymethylmethacrylate composite thin films

et al. 2009

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Polymer composite materials have considerable attention in the modern technology and are an object of numerous fundamental and scientific investigations. Polymer composite materials have advances in physical and optical properties over single materials. It is well known that the refractive index of the optical materials play an major role for all optical functional properties. The change of refractive index due to optical intensity is important for making photo-devices such as optical switching, optical memory, and logic circuits. In the present work, we have investigated the polythiophene family derivatives i.e. poly(3-octylthiophene) (P3OT) and polymethylmethacrylate (PMMA) composites materials. The poly(3-octylthiophene)/polymethylmethacrylate (P3OT/PMMA) composite thin films were prepared by spin coating as composing a prism-coupling waveguide. The UV-visible absorption spectrum of the composite film was recorded in the range 300-900 nm using UV-visible spectrophotometer. The thickness of the composite films was measured as 3 μm using a surface profile measuring system. The optical bistability of P3OT/PMMA waveguide was measured using an Nd:YAG laser with a wavelength of 1064 nm, pulse width of 5 ns and a repetition frequency of 10 Hz. The optical bistable characteristics of P3OT/PMMA composite films were measured with different input laser power intensities (0.16, 0.20, 0.24 and 0.26 GW/m 2 ) and the measured optical bistability shows good stability and hysteresis characteristics.However, in terms of the input laser power dependence of optical bistability, the switching on-off position shifts with the increase in the input laser power intensity was observed. In the input laser power dependence of optical bistability, the switching on-off position shifted with the increase of input laser power intensity. The optical bistable behaviors are very stable for P3OT/PMMA composite thin film after exposed to organic gas. It suggests that the composite film exposed to organic gas has larger grain size, better molecular orientation, homogeneous bulk and smooth surface than before organic gas treatment. The effect of organic gas treatment and PMMA molecular weight on the optical bistable behavior of P3OT/PMMA composite waveguide was investigated. The shift of on-off position of the optical bistability is decreased with the composite films treated with organic gas due to the smooth surface, better molecular orientation than before organic gas treatment.

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Theory of optical bistability in a non-linear quasi-waveguide

Cited by 7 publications

References 0 publications

Microcavity effect on the nonlinear intersubband response of multiple-quantum-well structures: The strong-coupling-regime

Microcavity effect on the nonlinear intersubband response of multiple-quantum-well structures: The strong-coupling-regime

Optical bistability of waveguide consisting of poly(3-hexylthiophene)/polymethylmethacrylate composite film

Optical bistability of polythiophene derivative/polymethylmethacrylate composite thin films

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