Temat: optical bistability

Skocz do pozycji: 1.

Tytuł:: Output-input properties of incident light on a defect dielectric slab with quantum dot nanostructure
Autorzy:: Jafarzadeh, Hossein
Tematy:: quantum dot nanostructure
optical bistability
optical multistability; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174095.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Optical bistability in double quantum dot molecule with inter-dot tunnelling
Autorzy:: Yu, Chunchao
Sun, Lihui
Zhang, Huafeng
Chen, Fang
Tematy:: optical bistability
quantum dot molecule
tunneling; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174307.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Creating the optical bistable switch in the dielectric slab doped with asymmetric semiconductor quantum wells
Autorzy:: Nasehi, R.
Tematy:: optical bistability
optical multistability
dielectric slab; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174447.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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
Tematy:: optical bistability
electromagnetically induced transparency
spontaneously generated coherence; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174730.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Optical MIDO : Multiple Inputs-Digital Output : device
Autorzy:: Alaiz-Gudin, Antonio M.
González-Marcos, Ana P.
Tematy:: distributed feedback laser
multi quantum well
optical bistability
semiconductor laser; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2063884.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: A control algorithm applied to polarization states of light in the nonlinear optical resonator
Autorzy:: Wierzbicki, M.
Tematy:: dwustabilność optyczna
układ nieliniowy
inverse modelling
nonlinear systems
optical bistability; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/206554.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Digital watermarking algorithm based on 4-level discrete wavelet transform and discrete fractional angular transform
Autorzy:: Li, Jing-You
Zhao, Chun-Hui
Zhang, Guang-Da
Tematy:: digital watermarking algorithm
mix optical bistability
Harris feature point detection
discrete wavelet transform
discrete fractional angular transform
singular value decomposition; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2033921.pdf Link otwiera się w nowym oknie
Opis:: Nowadays, there are many watermarking algorithms based on wavelet transform. The simple one is to insert directly the watermark into the wavelet transform coefficients. However, most of the existing watermarking schemes can only resist traditional signal processing attacks, such as image compression, noise and filtering. When the watermarked image is subject to geometric transformations, especially rotation attack, it is hard to detect the watermark successfully. In this paper, a digital watermarking algorithm is proposed based on 4-level discrete wavelet transform and discrete fractional angular transform. To enhance the security of the algorithm, the watermark is scrambled with the simplicity of Arnold transform and chaos-based mix optical bistability model, since the chaos is pseudorandom and sensitive to the initial values. And the watermark is embedded into the medium frequency sub-band of the 1-level wavelet decomposition according to the Harris feature point detection. Simulation results show that the proposed digital watermarking algorithm by combining 4-level discrete wavelet transform with discrete fractional angular transform could resist rotation attack and other common attacks.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

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
Tematy:: two-state quantum dot laser
lasing state switching
bistability
optical injection; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/173329.pdf Link otwiera się w nowym oknie
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 (w_inj) close to the lasing frequency of excited state (w_ES). 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 = w_inj – w_ES), 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.
Dostawca treści:: Biblioteka Nauki

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