scholarly journals Switchable Multimode Microlaser based on AIE Microsphere

2021 ◽  
Author(s):  
Fengyan Song ◽  
Chunhuan Zhang ◽  
Haiyun Dong ◽  
Yuqing Fan ◽  
Ming-Yu Wu ◽  
...  
Keyword(s):  
Photonic Devices ◽  
Starch Microsphere ◽  
Integration Levels

Switchable multimode microlasers are of great significance to the development of photonic devices with high integration levels. Herein, we demonstrate an acid/alkaline gas responsive multimode AIEgen@starch microsphere-based microlaser. The aggregation-induced...

scholarly journals Switchable Multimode Microlaser based on AIE Microsphere

2021 ◽  
Author(s):  
Hui Gao ◽  
Yong Sheng Zhao ◽  
Sijie Chen ◽  
Fengyan Song ◽  
Chunhuan Zhang ◽  
...  
Keyword(s):  
Rational Design ◽  
Gain Medium ◽  
Photonic Devices ◽  
Acid Vapor ◽  
Starch Microsphere ◽  
Whispering Gallery ◽  
Size Dependent ◽  
Output Wavelength ◽  
Integration Levels ◽  
Vapor Treatment

<p><a>Switchable multimode microlasers are of great significance to the development of photonic devices with high integration levels.</a> <a>Herein, we demonstrate an acid/alkaline gas responsive multimode AIEgen@starch microsphere-based microlaser. The aggregation-induced emission (AIE) active fluorescent dye ASCPI is used as the gain medium in this study. ASCPI was weakly emissive in water but became highly emissive when introduced to the starch microsphere as a guest molecule. The resultant ASCPI@starch microsphere worked well as a typical whispering-gallery-mode microlaser. The laser mode wavelengths were size dependent. Due to the sensitivity of ASCPI to pH, the output wavelength of the microlaser could be switched to shorter wavelength by acetic acid vapor treatment or longer wavelength by NH<sub>3</sub> vapor treatment. This work will provide a useful enlightenment for the rational design of effective switchable lasers using AIE materials with a simple preparation procedure.</a></p>

scholarly journals Switchable Multimode Microlaser based on AIE Microsphere

2021 ◽  
Author(s):  
Hui Gao ◽  
Yong Sheng Zhao ◽  
Sijie Chen ◽  
Fengyan Song ◽  
Chunhuan Zhang ◽  
...  
Keyword(s):  
Rational Design ◽  
Gain Medium ◽  
Photonic Devices ◽  
Acid Vapor ◽  
Starch Microsphere ◽  
Whispering Gallery ◽  
Size Dependent ◽  
Output Wavelength ◽  
Integration Levels ◽  
Vapor Treatment

<p><a>Switchable multimode microlasers are of great significance to the development of photonic devices with high integration levels.</a> <a>Herein, we demonstrate an acid/alkaline gas responsive multimode AIEgen@starch microsphere-based microlaser. The aggregation-induced emission (AIE) active fluorescent dye ASCPI is used as the gain medium in this study. ASCPI was weakly emissive in water but became highly emissive when introduced to the starch microsphere as a guest molecule. The resultant ASCPI@starch microsphere worked well as a typical whispering-gallery-mode microlaser. The laser mode wavelengths were size dependent. Due to the sensitivity of ASCPI to pH, the output wavelength of the microlaser could be switched to shorter wavelength by acetic acid vapor treatment or longer wavelength by NH<sub>3</sub> vapor treatment. This work will provide a useful enlightenment for the rational design of effective switchable lasers using AIE materials with a simple preparation procedure.</a></p>

Research and approaches to the integration processes in the European Union

2017 ◽  
pp. 126-133
Author(s):  
Alexander Motsyk
Keyword(s):  
Political Parties ◽  
The European Union ◽  
Goods And Services ◽  
Country Level ◽  
Fourth Level ◽  
Methodological Principles ◽  
Political Economic ◽  
The Relationship ◽  
Political Groups ◽  
Integration Levels

The article is devoted to the study of modern trends of integration processes. We studied the methodological principles and approaches to the study of the integration of subjects. Specifically analyzed integration levels: individual, regional, domestic, interstate, global. Also, isolated and characterized various forms of integration: political, economic, informational, cultural and others. We analyzed the integration process as a result of the relationship, cooperation, convergence and integration into a single unit of any parts, components countries, their economies, social and political structures, cultural, social and political groups, ethnic groups, political parties, movements and organizations. It is proved that integration has several levels of development. Interaction at the level of enterprises and organizations (first level) – directly to producers of goods and services. The integration of the economies of the main links of different countries is complemented by the interaction at the country level (the second level). The third level of development of integration processes – interaction at the level of parties and organizations, social groups and individuals from different countries – can be defined as a social and political one. Fourth level – is the level of the actual integration group as an economic community, with its characteristics and peculiarities. It was noted that today is used by political science approaches to the study of integration. It is important to the following principles: federalism, functionalism, communicative approach, and others. Keywords: Integration, levels, approaches, studies, European integration, politics, economics, features

scholarly journals Theoretical Analysis of Terahertz Dielectric–Loaded Graphene Waveguide

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 210
Author(s):  
Da Teng ◽  
Kai Wang
Keyword(s):  
Photonic Devices ◽  
Effective Index ◽  
The Finite Element Method ◽  
Index Method ◽  
Modal Properties ◽  
Terahertz Region ◽  
Effective Index Method ◽  
Integration Density ◽  
Device Integration ◽  
Potential Applications

The waveguiding of terahertz surface plasmons by a GaAs strip-loaded graphene waveguide is investigated based on the effective-index method and the finite element method. Modal properties of the effective mode index, modal loss, and cut-off characteristics of higher order modes are investigated. By modulating the Fermi level, the modal properties of the fundamental mode could be adjusted. The accuracy of the effective-index method is verified by a comparison between the analytical results and numerical simulations. Besides the modal properties, the crosstalk between the adjacent waveguides, which determines the device integration density, is studied. The findings show that the effective-index method is highly valid for analyzing dielectric-loaded graphene plasmon waveguides in the terahertz region and may have potential applications in subwavelength tunable integrated photonic devices.

scholarly journals Controlling wave fronts with tunable disordered non-Hermitian multilayers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Denis V. Novitsky ◽  
Dmitry Lyakhov ◽  
Dominik Michels ◽  
Dmitrii Redka ◽  
Alexander A. Pavlov ◽  
...  
Keyword(s):  
Incident Light ◽  
Passage Time ◽  
Photonic Devices ◽  
Gain Saturation ◽  
Wave Fronts ◽  
Optical Effects ◽  
Front Shape ◽  
Optical Applications ◽  
Increasing Demand ◽  
First Time

AbstractUnique and flexible properties of non-Hermitian photonic systems attract ever-increasing attention via delivering a whole bunch of novel optical effects and allowing for efficient tuning light-matter interactions on nano- and microscales. Together with an increasing demand for the fast and spatially compact methods of light governing, this peculiar approach paves a broad avenue to novel optical applications. Here, unifying the approaches of disordered metamaterials and non-Hermitian photonics, we propose a conceptually new and simple architecture driven by disordered loss-gain multilayers and, therefore, providing a powerful tool to control both the passage time and the wave-front shape of incident light with different switching times. For the first time we show the possibility to switch on and off kink formation by changing the level of disorder in the case of adiabatically raising wave fronts. At the same time, we deliver flexible tuning of the output intensity by using the nonlinear effect of loss and gain saturation. Since the disorder strength in our system can be conveniently controlled with the power of the external pump, our approach can be considered as a basis for different active photonic devices.

scholarly journals Pathways to increase the dissymmetry in the interaction of chiral light and chiral molecules

2021 ◽  
Author(s):  
Jake Greenfield ◽  
Jessica Wade ◽  
Jochen Brandt ◽  
Xingyuan Shi ◽  
Thomas Penfold ◽  
...  
Keyword(s):  
Photonic Devices ◽  
Next Generation ◽  
Chiral Molecules

The dissymmetric interaction between circularly polarised (CP) light and chiral molecules is central to a range of areas, from spectroscopy and imaging to next-generation photonic devices. However, the selectivity in...

scholarly journals Achromatic terahertz Airy beam generation with dielectric metasurfaces

Nanophotonics ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Qingqing Cheng ◽  
Juncheng Wang ◽  
Ling Ma ◽  
Zhixiong Shen ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Biomedical Imaging ◽  
Frequency Dispersion ◽  
Light Sheet ◽  
Photonic Devices ◽  
Self Healing ◽  
Beam Focusing ◽  
Light Sheet Microscopy ◽  
Airy Beam ◽  
Potential Applications ◽  
Airy Beams

AbstractAiry beams exhibit intriguing properties such as nonspreading, self-bending, and self-healing and have attracted considerable recent interest because of their many potential applications in photonics, such as to beam focusing, light-sheet microscopy, and biomedical imaging. However, previous approaches to generate Airy beams using photonic structures have suffered from severe chromatic problems arising from strong frequency dispersion of the scatterers. Here, we design and fabricate a metasurface composed of silicon posts for the frequency range 0.4–0.8 THz in transmission mode, and we experimentally demonstrate achromatic Airy beams exhibiting autofocusing properties. We further show numerically that a generated achromatic Airy-beam-based metalens exhibits self-healing properties that are immune to scattering by particles and that it also possesses a larger depth of focus than a traditional metalens. Our results pave the way to the realization of flat photonic devices for applications to noninvasive biomedical imaging and light-sheet microscopy, and we provide a numerical demonstration of a device protocol.

scholarly journals Lasing at the nanoscale: coherent emission of surface plasmons by an electrically driven nanolaser

Nanophotonics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 3965-3975 ◽  
Author(s):  
Dmitry Yu. Fedyanin ◽  
Alexey V. Krasavin ◽  
Aleksey V. Arsenin ◽  
Anatoly V. Zayats
Keyword(s):  
Data Storage ◽  
Surface Plasmon ◽  
Single Molecule ◽  
Optical Communication ◽  
Surface Plasmon Polariton ◽  
High Energy ◽  
Photonic Devices ◽  
Sensing Applications ◽  
Diverse Application ◽  
Plasmon Polariton

AbstractPlasmonics offers a unique opportunity to break the diffraction limit of light and bring photonic devices to the nanoscale. As the most prominent example, an integrated nanolaser is a key to truly nanoscale photonic circuits required for optical communication, sensing applications and high-density data storage. Here, we develop a concept of an electrically driven subwavelength surface-plasmon-polariton nanolaser, which is based on a novel amplification scheme, with all linear dimensions smaller than the operational free-space wavelength λ and a mode volume of under λ3/30. The proposed pumping approach is based on a double-heterostructure tunneling Schottky barrier diode and gives the possibility to reduce the physical size of the device and ensure in-plane emission so that the nanolaser output can be naturally coupled to a plasmonic or nanophotonic waveguide circuitry. With the high energy efficiency (8% at 300 K and 37% at 150 K), the output power of up to 100 μW and the ability to operate at room temperature, the proposed surface plasmon polariton nanolaser opens up new avenues in diverse application areas, ranging from ultrawideband optical communication on a chip to low-power nonlinear photonics, coherent nanospectroscopy, and single-molecule biosensing.

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