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1
Content available Optical MIDO : Multiple Inputs-Digital Output : device
Alaiz-Gudin Antonio M., González-Marcos Ana P.
Opto-Electronics Review
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2021
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Vol. 29, No. 4
106--116
EN
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.
2
Content available The influence of spontaneously generated coherence and phase of laser fields on optical bistability in a three-level atomic medium: an analytical approach
Van Doai Le, Minh Phuong Le Thi, Tien Dung Nguyen, Xuan Khoa Dinh, Huy Bang Nguyen
Optica Applicata
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2019
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Vol. 49, nr 3
509--522
EN
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.
3
Content available Output-input properties of incident light on a defect dielectric slab with quantum dot nanostructure
Jafarzadeh Hossein
Optica Applicata
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2019
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Vol. 49, nr 1
101--113
EN
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.
4
Content available Optical bistability in double quantum dot molecule with inter-dot tunnelling
Yu Chunchao, Sun Lihui, Zhang Huafeng, Chen Fang
Optica Applicata
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2019
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Vol. 49, nr 2
293--301
EN
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.
5
Content available Creating the optical bistable switch in the dielectric slab doped with asymmetric semiconductor quantum wells
Nasehi R.
Optica Applicata
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2016
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Vol. 46, nr 4
541--551
EN
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.
6
Content available remote Properties of the angular gap in one-dimensional periodic structures containing left-handed metamaterials
Ali M. Z.
Optica Applicata
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2011
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Vol. 41, nr 1
41--49
EN
Wave propagation is investigated in one-dimensional periodic structures containing layers of left-handed metamaterials. For a special choice of parameters, an angular gap appears due to total internal reflection in a certain frequency region. This gap has been found insensitive to the polarization of light and the length scale of the periodic structure for linear wave propagation. We have studied phenomenon of bistability related to this gap for nonlinear wave propagation. As far as the sign of the Kerr nonlinearity is concerned, the said gap shows the same character as that related to the Bragg gap. It is further shown that the bistable character related to the gap is sensitive to the polarization of the incident radiation and length scale of the periodic structure.
7
Content available remote Optical bistability of planar metal/dielectric nonlinear nanostructures
Noskov R. E., Zharov A. A.
Opto-Electronics Review
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2006
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Vol. 14, No. 3
217-223
EN
We study theoretically a nonlinear response of the planar metal/dielectric nanostructures constituted from periodical array of ultra thin silver layers and the layers of Kerr-like nonlinear dielectric. We predict hysteresis-type dependences of the components of the tensor of effective dielectric permittivity on the field intensity allowing the change in material transmission properties from transparent to opaque and back at extremely low intensities of the light. It makes possible to control the light by light in all-optical nanoscale devices and circuits.
8
Magneto-optical bistability of organic semiconductors
Derevyanchuk O., Zenkova C., Kramar V., Nitsovich B.
Elektronika : konstrukcje, technologie, zastosowania
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2004
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Vol. 45, nr 8-9
303-304
EN
The particularities of nonlinear absorption by organic semiconductors in the external magnetic field has been studied. The special features of hysteresis loop formation in the incoming-outgoing light intensity dependence has been investigated. The form function of exciton absorption with the polarization of laser radiation and a weak magnetic field has been calculated. It is found that the magneto-optical response of molecular semiconductors gives rise to the inverse character of OB loop formations, which allows to control and influence the behaviour of OB elements of optical logical systems.
PL
Prowadzono prace badawcze nad specylicznymi właściwościami nieliniowej absorpcji półprzewodników organicznych w zewnętrznym polu magnetycznym. Badano cechy szczególne związane z tworzeniem się pętli histerezy zależności pomiędzy natężeniem światła przychodzącego a wychodzącego. Wyznaczono kształt funkcji absorpcji ekscytonów przy polaryzacji za pomocą promieniowania laserowego oraz słabego pola magnetycznego. Stwierdzono, że odpowiedź magnetooptyczna półprzewodników molekularnych zapoczątkowuje odwrotny charakter tworzenia się pętli optycznej bistabilności, która pozwala na sterowanie i wpływanie na zachowanie optycznie bistabilnych elementów optycznych systemów logicznych.
9
Content available A control algorithm applied to polarization states of light in the nonlinear optical resonator
Wierzbicki M.
Control and Cybernetics
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2002
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Vol. 31, no 1
129-139
EN
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.
10
Content available remote Beam switching at planar photonic structures
Nasalski W.
Opto-Electronics Review
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2001
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Vol. 9, No. 3
280-286
EN
Beam reflection at a focusing nonlinear-linear interface near critical incidence of total internal reflection is analysed. Basics of the three-dimensional formulation of the problem are outlined. Numerical simulations of the beam reflection are presented. It is shown that owing to cross focusing and deformations of incident and reflected beams, a bistable switch is possible to achieve. Characteristic features of this switch are discussed.
11
Content available remote Polarization bistability in a smectic-A liquid crystal.
Pura B., Wierzbicki M., Petykiewicz J., Ratusznik G.J., Wrzesiński Z.
Optica Applicata
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2001
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Vol. 31, nr 3
619-624
EN
We report the measurements the of laser light polarization transmitted through the smectic-A phase of a liquid crystal placed inside the Fabry-Perot optical resonator. All four parameters of polarization were measured simultaneously by an ellipsometer of a special construction. Optical polarization bistability phenomenon was observed, in which polarization parameters of outgoing light depend nonlinearly on the intensity of the input beam. We propose a theoretical explanation of this phenomenon, based on the concept of orientational nonlinearity of liquid crystal's molecules
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