Behnam Kazempour; Fatemeh Moslemi
Abstract
In this paper, multichannel filter tunability containing magnetized plasma and anisotropic metamaterial in 1D ternary photonic crystal is theoretically investigated and designed at the GHz frequency range. The results show that resonance modes in transmission spectrum of the proposed structure without ...
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In this paper, multichannel filter tunability containing magnetized plasma and anisotropic metamaterial in 1D ternary photonic crystal is theoretically investigated and designed at the GHz frequency range. The results show that resonance modes in transmission spectrum of the proposed structure without defining defect layer are created and the structure can act as the multichannel filter. The tunability of the transmission spectrum of the proposed structure by applying an external magnetic field is investigated and shown that channels frequency can be red or blue shifted depending on the orientation of external magnetic field. In addition, the effect of the number of periodicities, optical axis angle of anisotropic metamaterial and incident angle on the filter properties of channels for both TE and TM polarization is investigated.
noushin dadashzadeh
Abstract
Plasma technology is used in many countries in various fields such as ozone production, surface treatment, surface modification, medicine, etc. Plasma generated with microwave-like waves is a promising and interesting technology for its unique and versatile properties. These characteristics of microwave ...
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Plasma technology is used in many countries in various fields such as ozone production, surface treatment, surface modification, medicine, etc. Plasma generated with microwave-like waves is a promising and interesting technology for its unique and versatile properties. These characteristics of microwave plasma make it an alternative technology compared to traditional thermal chemical reactors, provided that its specific technical challenges are met. In this numerical study, the properties of microwave plasma with a frequency of 2.45 GHz and argon gas at atmospheric pressure were investigated. By varying the input power of the device in the range of 10 W to 20 W in magnetic mode and mode (TM), the comparative profiles of electron density, electron temperature, electric field are shown. The simulation results show the production of chemical elements in microwave plasma. High-energy electrons and electron density are considered as the main factors affecting the properties of microwave plasma.
Parisa Mahmoudi
Abstract
The field of brain mapping reveals that each region within the nervous system performs specific functions, with neurons in neural networks communicating through complex spatiotemporal patterns. Implementing these neuronal activity patterns is crucial for neuroscience to control neural activity and treat ...
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The field of brain mapping reveals that each region within the nervous system performs specific functions, with neurons in neural networks communicating through complex spatiotemporal patterns. Implementing these neuronal activity patterns is crucial for neuroscience to control neural activity and treat diseases. Researchers use these patterns for targeted neural stimulation of neurons to uncover the secrets of information processing in the brain's intricate networks. Optical neural stimulation, as a powerful tool for manipulating neurons, employs optical modulation techniques to achieve patterned light illumination on neural tissue surfaces. On the other hand, the design of implants that deliver effective, patterned light pulses to target neurons deep within brain tissue is significantly evolving. These tools enable the reconstruction of neuronal activity patterns in both two and three dimensions. This study highlights the necessity of achieving patterned light delivery techniques to neural tissue by introducing various optical stimulation techniques. Subsequently, patterned light implementation through advanced technologies, including scanning lasers, liquid crystal modulators, and digital micromirror modulators, is examined with their unique advantages and challenges. Finally, the notable advancements in fiber optic arrays, waveguides, and micro light-emitting diodes, which collectively pave the way toward more complex and less invasive neural stimulation techniques, are reviewed.