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Tytuł:
Optical bistability in double quantum dot molecule with inter-dot tunnelling
Autorzy:
Yu, Chunchao
Sun, Lihui
Zhang, Huafeng
Chen, Fang
Powiązania:
https://bibliotekanauki.pl/articles/174307.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical bistability
quantum dot molecule
tunneling
Opis:
We have theoretically studied the optical bistability behaviors under an external electric field and a coupling laser field in double quantum dot molecule system with π-type four energy levels. It can be adjusted by the system parameters such as the electronic cooperation parameter, the tunneling strength, the coupling laser field, the probe and coupling laser detuning. These results may be useful in the experiment and provide new types of all-optical switching.
Źródło:
Optica Applicata; 2019, 49, 2; 293-301
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power-induced lasing state switching and bistability in a two-state quantum dot laser subject to optical injection
Autorzy:
Jiang, Zaifu
Wu, Zhengmao
Jayaprasath, Elumalai
Yang, Wenyan
Hu, Chunxia
Cui, Bing
Xia, Guangqiong
Powiązania:
https://bibliotekanauki.pl/articles/173329.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
two-state quantum dot laser
lasing state switching
bistability
optical injection
Opis:
We theoretically investigate power-induced lasing state switching and bistability in a two-state quantum dot laser subject to optical injection. The simulated results show that, for a free-running two-state quantum dot laser operating at the ground state under low current, a power-induced lasing state switching between the ground state and the excited state can be achieved through introducing optical injection with a frequency (winj) close to the lasing frequency of excited state (wES). The injection power required for the state switching depends on the scanning route of injection power, i.e. there may exist state bistability for the injection power within a certain region. For forward scanning injection power, with the increase of frequency detuning (ΔΩ = winj – wES), the injection power required for the state switching shows a decreasing trend accompanied by slight fluctuations. However, for backward scanning injection power, the injection power required for the state switching exhibits obvious fluctuations with the increase of ΔΩ. The width of the hysteresis loop fluctuates with ΔΩ, and the fluctuation amplitude is increased with the increase of the injection current. Additionally, the influences of the inhomogeneous broadening factor and the electron escape rate on the bistability performances are analyzed.
Źródło:
Optica Applicata; 2020, 50, 2; 257-269
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observation of Optical Bistability in Cholesteric Liquid Crystals
Autorzy:
Pura, B.
Gronowska, I.
Petykiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1967855.pdf
Data publikacji:
1997-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Pc
42.70.-a
Opis:
In the paper, some experimental and theoretical results concerning optical bistability in cholesteric liquid crystals are presented. A strong primary laser beam interacted nonlinearly with the material and influenced a second (probe) beam in such a way that its transmitted part exhibited a bistable dependence on the intensity of the first beam. It was observed that such a character may be attributed to the intensity of the outgoing probe wave. The obtained results reflect the symmetry of the sample and are interpreted as second order nonlinearity effects.
Źródło:
Acta Physica Polonica A; 1997, 92, 3; 527-533
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of spontaneously generated coherence and phase of laser fields on optical bistability in a three-level atomic medium: an analytical approach
Autorzy:
Van, Doai Le
Minh, Phuong Le Thi
Tien, Dung Nguyen
Xuan, Khoa Dinh
Huy, Bang Nguyen
Powiązania:
https://bibliotekanauki.pl/articles/174730.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical bistability
electromagnetically induced transparency
spontaneously generated coherence
Opis:
The influence of spontaneously generated coherence and relative phase of laser fields on optical bistability in a three-level atomic medium under electromagnetically induced transparency was studied by using a density matrix theory. An input-output intensity relation of a probe laser field is derived as an analytical function of parameters of a controlling light field, the relative phase, and the spontaneously generated coherence. This function can be fitted with experimental values to be a semi-empirical model which is helpful for finding related applications. It is shown that thresholds and width of the optical bistability hysteresis loop can be manipulated with the controllable parameters. On the other hand, the influence of population relaxation between two ground hyperfine levels on the optical bistability behavior is significant for small coupling field intensity.
Źródło:
Optica Applicata; 2019, 49, 3; 509-522
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Creating the optical bistable switch in the dielectric slab doped with asymmetric semiconductor quantum wells
Autorzy:
Nasehi, R.
Powiązania:
https://bibliotekanauki.pl/articles/174447.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
optical bistability
optical multistability
dielectric slab
Opis:
We have investigated the optical switching in a dielectric slab with a novel configuration of solid-state medium. This new scheme combines the attractive features of all-optical switching in dielectric medium doped with asymmetric quantum well nanostructure with the ability to convert the optical bistability to multistability (or vice versa) by using the strength of Fano interference and the energy splitting effect. The dependence of optical bistability behavior on the intensity of the strong coupling field and the slab thickness is also given.
Źródło:
Optica Applicata; 2016, 46, 4; 541-551
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-Focusing and Optical Bistability in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te
Autorzy:
Kowalczyk, L.
Suchocki, A.
Gałązka, R. R.
Powiązania:
https://bibliotekanauki.pl/articles/1929620.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Jx
Opis:
Thermally induced self-focusing of laser beam and optical bistability in CdMnTe at room temperature has been investigated. Photothermal focal length as a function of intensity of laser radiation has been measured in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te for 0.3 ≤ x ≤ 0.6. The time-dependence of the transmitted power for various laser intensities has been investigated and the switching from the transparent to dark state has been observed. For the first time the optical bistable characteristic has been measured in CdMnTe. The results indicate that CdMnTe is a suitable material for cavityless, large contrast, thermally induced absorptive bistable operation in visible region.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 519-522
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Output-input properties of incident light on a defect dielectric slab with quantum dot nanostructure
Autorzy:
Jafarzadeh, Hossein
Powiązania:
https://bibliotekanauki.pl/articles/174095.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
quantum dot nanostructure
optical bistability
optical multistability
Opis:
We demonstrate output-input properties of incident light in a defect slab doped by three-level quantum dot nanostructure via quantum coherence and Fano-interference phenomena. Here, we will show that the output-input properties of the system can be adjusted by the Fano-interference strength, amplitude and the relative phase of the driving fields, respectively. Also, we consider the thickness effect of defect medium on controlling the output-input behaviors of probe light. Moreover, we realize that it is possible to switch between optical bistability and optical multistability by optimizing the conditions which are more practical in all-optical switching based nanoscale devices.
Źródło:
Optica Applicata; 2019, 49, 1; 101-113
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical MIDO : Multiple Inputs-Digital Output : device
Autorzy:
Alaiz-Gudin, Antonio M.
González-Marcos, Ana P.
Powiązania:
https://bibliotekanauki.pl/articles/2063884.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
distributed feedback laser
multi quantum well
optical bistability
semiconductor laser
Opis:
Advances in photonic technologies, with new processes and scopes of photonic integrated circuits, have generated a lot of interest as the field allows to obtain sensors with reduced size and cost and build systems with high interconnectivity and information density. In this work, answering the needs of photonic sensors that must be portable, more energy- efficient, and more accurate than their electrical counterparts, also with a view to the emerging field of neuromorphic photonics, a versatile device is presented. The proposed device makes use of the well-known advantages provided by optical bistability. By combining two distributed feedback-multi quantum well semiconductor laser structures, this new optical multiple inputs - digital output device offers various essential purposes (such as logic gates, wavelength detector and monitoring) with no need for specific manufacturing for each of them. Through a commercial computer-aided design tool, VPIphotonics™, the necessary characterization of proposed device is also described.
Źródło:
Opto-Electronics Review; 2021, 29, 4; 106--116
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Polarisation Bistability in χ$\text{}^{2}$ Media at Large Desynchronisation Regime
Autorzy:
Jęda, W.
Zagórski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2037264.pdf
Data publikacji:
2004-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Ky
42.65.Hw
42.65.Pc
Opis:
In this work we present results of calculations concerning bistability of optical polarisation in birefringent media. Second-order optical nonlinearity is assumed to be dominant and represented by one parameter. In our model the second-harmonic generation regime is assumed. Light transmission is analysed in terms of standard Fabry-Perot model of feedback. We derived formulas for the Stokes parameters describing the polarisation state. Numerical results showed that three parameters may exhibit bistable behaviour. This creates new possibilities for optical switching.
Źródło:
Acta Physica Polonica A; 2004, 105, 4; 357-363
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Model of Optical Bistability and Polarisation Evolution in Birefringent χ$\text{}^{(2)}$ Nonlinear Media
Autorzy:
Jęda, W.
Zagórski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2011062.pdf
Data publikacji:
1999-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Pc
42.65.Hw
Opis:
We present a model calculation of optical bistability and polarisation evolution in optically birefringent media based on the interaction of three waves. Second-order optical nonlinearity (described by the third rank susceptibility tensor) is assumed to be dominant. A bistable light transmission is analysed in terms of standard Fabry-Perot model of feedback, and is a direct consequence of the results obtained for a semi-infinite medium. A second effect considered in the paper is evolution of polarisation state of the waves involved in these processes. We derived a closed formula for intensity-dependent refractive index, which corresponds to that used in the case of third-order nonlinear media. As a result, we calculated both intensity and Stokes parameters of transmitted light.
Źródło:
Acta Physica Polonica A; 1999, 96, 3-4; 373-381
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intensity and Polarisation Bistability in Two Primary-Wave Mixing in Media with Second-Order Nonlinearity
Autorzy:
Seroczyńska, M.
Zagórski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2027388.pdf
Data publikacji:
2001-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Hw
42.65.Ky
Opis:
In this paper we analyse theoretically the transmission of two strong laser beams through a medium exhibiting optical nonlinearity of the second order combined with a linear anisotropy. A standard model of two wave mixing was applied and closed formulas for intensity and polarisation state were obtained. Numerical calculations show that outgoing beams are very sensitive to the state of incoming beams and to the material characteristics. Under some realistic conditions we were able to obtain bistability of both intensity and polarisation state. The results also show how to modulate the intensity and polarisation state of one wave by another one.
Źródło:
Acta Physica Polonica A; 2001, 99, 6; 655-663
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Area of the unstable solution of rolling equation : jumps of the oscillations amplitude
Autorzy:
Wawrzyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/246425.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ship rolling
nonlinear oscillations
nonlinear resonance
bistability
bifurcations
amplitude jumps
Opis:
The most interesting motion of the ship is rolling. This is because the rolling amplitudes are much bigger than amplitudes of other degrees of freedom and under resonance conditions, which can exceed 40º. In such a case, when the maximum of the righting arm curve is placed at relatively small angles, the roll equation reveals a strongly nonlinear character and bistability areas as well as an area of unstable solutions of the roll equation occurs. Together with the appearance of the above-mentioned areas, amplitude jumps are possible. In the study, the case of strongly nonlinear rolling is analysed. For the purpose of numerical simulations, the 1DOF mathematical model of rolling with damping dependent on amplitude and frequency is used. The article presents the roll spectrum including the bistability areas and the area of unstable solutions for one loading condition of the offshore support vessel. It is demonstrated that for strongly nonlinear rolling, rolling with two different amplitudes for the same value of excitation is possible. It is also shown that transitions (jumps) between these amplitudes are possible too. A few scenarios of jumps of the rolling amplitude within the region of unstable solutions of the rolling equation are presented. The presented rolling scenarios show that under some circumstances rolling can be observed as chaotic.
Źródło:
Journal of KONES; 2018, 25, 3; 489-496
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Harvesting mechanical vibrations energy using nonlinear electromagnetic minigenerators - a survey of concepts and problems
Autorzy:
Kulik, M.
Jagieła, M.
Powiązania:
https://bibliotekanauki.pl/articles/376373.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
energy harvesting
nonlinear resonance
bistability
electromagnetic induction
Opis:
The state of knowledge in the field of conversion of energy of mechanical vibrations into electrical energy using nonlinear electromagnetic generators is presented. The principle of operation of the considered converters is based on the Faraday law. The electromotive force is induced by the relative movement of the coil or permanent magnets under impact of externally applied vibrations. In order to diminish the disadvantages of conventional generators, namely the narrow frequency bandwidth, in recent years the nonlinear systems were introduced that exhibit the nonlinear resonance phenomenon. Broadening the frequency bandwidth, in which the power generated by the system is relatively high, is realized via introduction of nonlinear force into system kinematics. Designing such systems becomes a big challenge. Based on thorough survey of recent publications as well as on own expertise in the field, the work compares a few concepts of nonlinear electromechanical minigenerators in term of their functional characteristics and design problems. Sample calculations of frequency characteristics using time- and frequency-domain models are presented.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 90; 347-358
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A control algorithm applied to polarization states of light in the nonlinear optical resonator
Autorzy:
Wierzbicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/206554.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
dwustabilność optyczna
układ nieliniowy
inverse modelling
nonlinear systems
optical bistability
Opis:
In this paper a control algorithm is presented for a nonlinear system defined by a nonlinear mapping F : R^n -> R^n of input states to output states of the system, for the problem of motion in the R^n space of output states along the given trajectory. The application of this algorithm in nonlinear optics is presented, for the control of light polarization transmitted through the Fabry-Perot resonator filled with a material with nonlinear optical properties. The calculated trajectory in the space of polarization states of output light leads to the phenomenon of optical bistability, i.e. sudden changes of output polarization induced by small variations of the input parameters, and the dependence of the current state of light polarization on the history of the system.
Źródło:
Control and Cybernetics; 2002, 31, 1; 129-139
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Bistability Induced by Additive Colored Noise in the Exciton-Biexciton System
Autorzy:
Gonţia, I. I.
Rotaru, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/1933412.pdf
Data publikacji:
1995-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.40.+j
05.70.Fh
42.65.Pc
Opis:
This paper predicts optical bimodality induced by external additive noise with a finite bandwidth, in the exciton-biexciton system.
Źródło:
Acta Physica Polonica A; 1995, 87, 6; 911-917
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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