Abstract:In this paper, we investigate the strong modification and reshaping of the Laguerre-Gaussian (LG) beam using a tailored magnetized plasma photonic crystal (PPC), based on the angular spectrum expansion and 4×4 matrix method. It is numerically shown that by manipulating both external magnetic field and plasma number density, the reflected and transmitted beam shape is perfectly controlled. In addition, to show the domain role of magnetized PPC birefringence in the shaping of the twisted beam (TB), vertical inci… Show more
“…Apart from the reshaping of the output patterns, one can see a rotation of the twin part of intensity profile with increasing . As is known, this shape rotation is originated from circular birefringence of plasma-ferrite layer in the presence of external magnetic field 14 , 53 , 54 , and can be adjusted via variation of the plasma number density and other external parameters. Figure 7 OAM spectrums of transmitted VB for Oe , , , GHz, and cm .…”
Section: Resultsmentioning
confidence: 99%
“…Stratified metamaterials owning to the multi reflection and transmission characteristics have provided effective media in order to modify amplitude, phase, location, and polarization of incoming electromagnetic waves 10 – 12 . Especially, employing external electric or magnetic fields over such inhomogeneous media enables a higher degree of control over the radiation field through anisotropy-related phenomena such as optical birefringence 13 , 14 . In recent years, indisputable prevalence of metamaterial technologies has overshadowed the plasma applications, and aroused a burgeoning interest in exploring optical and magneto-optical properties of plasma metamaterials 15 – 17 .…”
This paper is devoted to the study of vortex beam transmission from an adjustable magnetized plasma-ferrite structure with negative refraction index. We use the angular spectral expansion technique together with the $$4\times 4$$
4
×
4
matrix method to find out the transmitted intensity and phase profiles of incoming Laguerre-Gaussian beam. Based on numerical analysis we demonstrate that high transparency and large amount of Faraday rotation in the proximity of resonance frequency region, reverse rotation of spiral wave front, and side-band modes generation during propagation are the remarkable features of our proposed structure. These controllable properties of plasma-ferrite metamaterials via external static magnetic field and other structure parameters provide novel facilities for manipulating intensity and phase profiles of vortex radiation in transmission through the material. It is expected that the results of this work will be beneficial to develop active magneto-optical devices, orbital angular momentum based applications, and wavefront engineering.
“…Apart from the reshaping of the output patterns, one can see a rotation of the twin part of intensity profile with increasing . As is known, this shape rotation is originated from circular birefringence of plasma-ferrite layer in the presence of external magnetic field 14 , 53 , 54 , and can be adjusted via variation of the plasma number density and other external parameters. Figure 7 OAM spectrums of transmitted VB for Oe , , , GHz, and cm .…”
Section: Resultsmentioning
confidence: 99%
“…Stratified metamaterials owning to the multi reflection and transmission characteristics have provided effective media in order to modify amplitude, phase, location, and polarization of incoming electromagnetic waves 10 – 12 . Especially, employing external electric or magnetic fields over such inhomogeneous media enables a higher degree of control over the radiation field through anisotropy-related phenomena such as optical birefringence 13 , 14 . In recent years, indisputable prevalence of metamaterial technologies has overshadowed the plasma applications, and aroused a burgeoning interest in exploring optical and magneto-optical properties of plasma metamaterials 15 – 17 .…”
This paper is devoted to the study of vortex beam transmission from an adjustable magnetized plasma-ferrite structure with negative refraction index. We use the angular spectral expansion technique together with the $$4\times 4$$
4
×
4
matrix method to find out the transmitted intensity and phase profiles of incoming Laguerre-Gaussian beam. Based on numerical analysis we demonstrate that high transparency and large amount of Faraday rotation in the proximity of resonance frequency region, reverse rotation of spiral wave front, and side-band modes generation during propagation are the remarkable features of our proposed structure. These controllable properties of plasma-ferrite metamaterials via external static magnetic field and other structure parameters provide novel facilities for manipulating intensity and phase profiles of vortex radiation in transmission through the material. It is expected that the results of this work will be beneficial to develop active magneto-optical devices, orbital angular momentum based applications, and wavefront engineering.
“…Magnetized cold plasma (MCP) can be used as PC material by researchers (Liu and Wu 2021;Shiri et al 2019;Sakai et al 2007;Naderi Dehnavi et al 2017;Nobahar et al 2018;Kamboj et al 2021;Askari et al 2015;Awasthi et al 2017Awasthi et al , 2018Lyubchanskii et al 2003;Inoue et al 2006). Chang et al (2016) investigated magnetic field tunable filter application of 1D-PC using magnetized plasma and air multilayered structure in microwave frequency (Chang et al 2016).…”
In this paper, we theoretically propose a novel magnetic field-dependent sensor using omnidirectional magnetized cold plasma photonic crystal in one dimension for TE polarization. The structure consists of asymmetric two periodic arrays from magnetized cold plasma and sample cavity layer. Between the periodic arrays, a sample cavity is sandwiched between two quartz layers. The methodology of the proposed detector depends on the appearance of a sensitive defect mode. The results clear that the defect mode frequency depends significantly on the refractive index of the sample, and it is extremely sensitive to incident angle changes, applied magnetic field, the number density of electrons, and sample layer thickness. The optimized proposed sensor has high sensitivity of 15.14 GHz/RIU, quality-factor of 527.32, and figure of merit of 1066.20 RIU−1, where RIU means refractive index unit. So, the proposed sensor can aid in solving many challenges in chemical and environmental applications.
“…The beam shaping is still an active research field that supplies various methods in inverse problems for getting desired beam patterns [21,22,27] and also gives rise to new research directions in study of structured light [28,29]. Recently, the studies on beam shaping by using new materials, such as plasma-related material [30,31], emerge and exhibit their potential in manipulation of beam structures [32,33]. There are many ways used in beam shaping, basically, including tailoring single parameter, like controlling the spatial distribution of the phase [18,34], the polarization [20,25], the coherence [35,36] of the input beams, and manipulating multi-parameters, for instance the phase-coherence method [37,38], the phase-polarization method [27], the amplitude-phase-polarization joint method [39].…”
In this article we propose a new type of optical vortex, the X-type vortex. This vortex inherits and develops the conventional noncanonical vortex, i.e. it no longer has a constant phase gradient around the center, while the intensity keeps invariant azimuthally. The strongly focusing properties of the X-type vortex and its effect on the beam shaping in three-dimensional (3D) fields are analyzed. The interesting phenomena, which cannot be seen in canonical vortices, are observed, for instance the ‘switch effect’ which shows that the intensity pattern can switch from one transverse axis to another in the focal plane by controlling the phase gradient parameter. It is shown that by adjusting the phase gradient of this vortex, the focal field can have marvelous patterns, from the doughnut shape to the shapes with different lobes, and the beam along propagation direction will form a twisting shape in 3D space with controllable rotation direction and location. The physical mechanisms underlying the rule of the beam shaping are also discussed, which generally say that the phase gradient of the X-type vortex, the orbital angular momentum, the polarization and the ‘nongeneric’ characteristic contribute differently in shaping fields. This new type of vortex may supply a new freedom for tailoring 3D optical fields, and our work will pave a way for exploration of new vortices and their applications.
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