Bianisotropic Metasurfaces for Optimal Polarization Control: Analysis and Synthesis

Pfeiffer, Carl; Grbic, Anthony

doi:10.1103/physrevapplied.2.044011

Cited by 397 publications

(294 citation statements)

References 51 publications

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“…Alternatively, similar metasurface designs could be used to generate other highly structured optical modes, such as soleniod beams that pull microparticles along helical paths [11]. In addition, the metasurface could exhibit an anisotropic or bianisotropic response to provide micromanipulation control through polarization adjustment [33,46]. For example, it should be possible to control the degree at which microparticles are pushed or pulled by simply changing the polarization of the incident Gaussian beam [12,13].…”

Section: Discussionmentioning

confidence: 99%

“…5 with a linearly polarized Gaussian beam [26]. Metasurfaces are ideal candidates for generating arbitrary beams since they are compact and have demonstrated extreme control of a wavefront's amplitude, phase, and polarization [27][28][29][30][31][32][33][34]. Dielectric metasurfaces are particularly attractive since they are low loss and can handle high power [35][36][37][38].…”

Section: Generating Tractor Beams With Metasurfacesmentioning

confidence: 99%

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Generating stable tractor beams with dielectric metasurfaces

Pfeiffer

Grbic

2015

Phys. Rev. B

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Propagation invariant beams that pull objects towards a light source are commonly known as tractor beams. Here, an efficient linearly polarized tractor beam with improved stability is introduced. The beam consists of a superposition of TE and TM polarized Bessel beams of orders m = +1 and m = −1. It is shown that this beam can stably pull a wide range of dielectric microparticles arbitrarily long distances, independent of ambient conditions. Next, a straightforward method of generating these high performance beams is proposed. A Si metasurface transforms an incident linearly polarized Gaussian beam into the desired tractor beam. Full-wave simulations demonstrate that it is possible for this simple geometry to pull a polystyrene sphere a distance equal to the non-diffracting range of the Bessel beam. The simplicity of the setup and the robust performance of the proposed tractor beam significantly enhance the ability to manipulate matter with light.

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Section: Discussionmentioning

confidence: 99%

Section: Generating Tractor Beams With Metasurfacesmentioning

confidence: 99%

Generating stable tractor beams with dielectric metasurfaces

Pfeiffer

Grbic

2015

Phys. Rev. B

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“…However, many applications have more stringent requirements on axial ratio and insertion loss (e.g., axial ratios below 1 dB), which could be realized by modifying the cost function. Alternatively, the proposed design process could be applied a variety of other polarization transforming devices to significantly increase their bandwidth as well [23,26].…”

Section: Discussionmentioning

confidence: 99%

“…The dimension L p primarily affects the capacitance of the patch along the v-direction Again, the u and v directions correspond to the principal axes of each sheet, which are rotated by an angle β relative to the global xy coordinate system. The simulated sheet impedances are inserted into a MATLAB routine that analytically calculates the S-parameters of the cascaded structure [23,24]. This routine is used by the genetic algorithm to optimize the dimensions and orientation of each sheet.…”

Section: Cascaded Sheet Impedance Polarizermentioning

confidence: 99%

Linear-to-Circular Polarizers for Multi-Octave Bandwidths and Wide Scan Angles at Mm-Wave Frequencies Using Rotated Anisotropic Layers

Pfeiffer¹,

Tomasic²

2017

PIER C

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Abstract-Linear-to-circular polarizers operating from roughly 17 to 65 GHz, and angles of incidence up to 60 • are reported. These polarizers convert incident linearly polarized radiation into circular polarization upon transmission. First, previous designs inspired by the optics community using cascaded waveplates are scaled down to mm-wave frequencies. The naturally occurring anisotropic crystals that the optics community employed are replaced here with metamaterials. The range of incidence angles is improved by utilizing biaxial artificial dielectrics whose permittivity in the x, y and z directions are all engineered. Next, an ultra-wideband linear-to-circular polarizer consisting of cascaded sheet impedances is reported. The cascaded sheet impedance polarizer utilizes a combination of meanderline and metallic patch geometries. The principal axes of each patterned metallic sheet are oriented at an optimized angle, which increases the design degrees of freedom and performance. This polarizer has the advantages of being thinner and easier to fabricate than the polarizer utilizing cascaded waveplates, but is more difficult to design. Both polarizers rely heavily on genetic algorithm optimization in the design process to realize multiple octaves of bandwidths and robust performance at wide angles of incidence. The polarizers are fabricated with commercial printed-circuit-boards and then experimentally characterized.

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“…Of late, some planar metasurfaces have been proposed, which are suitable for microscopic fabrication so as to work at quite high frequencies [30][31][32][33]. In this article, we will theoretically and rigorously prove that the effective surface magnetic impedance can be achieved by employing parallel planar metasurfaces with only identical surface electric impedances.…”

Section: Introductionmentioning

confidence: 99%

Surface Impedance Synthesis Using Parallel Planar Electric Metasurfaces

Zhu¹

2017

PIER

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Abstract-Metasurfaces, due to its designable surface electric and magnetic impedances, have largely enhanced electromagnetic wave manipulation techniques. The conventional approach to realize the surface magnetic impedance requires non-planar structures, such as metallic loops, which is not easy to fabricate, especially at optical frequencies. In this work, we theoretically and rigorously prove that effective surface magnetic and electric impedances can be obtained using parallel electric metasurfaces. A synthesis method is presented which allows independent designs of surface electric and magnetic impedances. Finally, a polarization converter with high energy efficiency is designed using the proposed impedance synthesis method for verification. The proposed synthesis method is favorable for reducing fabrication complexities.

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Bianisotropic Metasurfaces for Optimal Polarization Control: Analysis and Synthesis

Cited by 397 publications

References 51 publications

Generating stable tractor beams with dielectric metasurfaces

Generating stable tractor beams with dielectric metasurfaces

Linear-to-Circular Polarizers for Multi-Octave Bandwidths and Wide Scan Angles at Mm-Wave Frequencies Using Rotated Anisotropic Layers

Surface Impedance Synthesis Using Parallel Planar Electric Metasurfaces

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