Analysis and synthesis of cascaded metasurfaces using wave matrices

Ranjbar, Amin; Grbic, Anthony

doi:10.1103/physrevb.95.205114

Cited by 35 publications

(26 citation statements)

References 23 publications

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“…In Eq. 9, the intercept ω 0 and the coefficients c iα are determined by invoking the Fletcher-Reeves-Polak-Ribiere method 82 and minimizing the differences in frequencies as predicted using the frequency map and DFT calculations for the NMP-water clusters, 2 . Note that CMP, TMP and UMP all contain C=O and C=C groups, and their ω DFT are calculated from the HMR method.…”

Section: Vibrational Frequency Maps For the Nucleobase C=o Stretchesmentioning

confidence: 99%

“…with proteins and ligands. [1][2][3][4][5][6][7] For example, X-ray diffraction has led to the breakthrough discovery of the DNA double helix, 8 while nuclear magnetic resonance spectroscopy has revealed the structures and internal motions of nucleic acids at atomic resolution. 4,7,9,10 Vibrational spectroscopy, such as infrared (IR) and Raman spectroscopy, provides a complementary and versatile tool to probe the structures and dynamics of nucleic acids ranging from small oligonucleotides to native DNA and RNA in real time in situ.…”

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confidence: 99%

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Development of Vibrational Frequency Maps for Nucleobases

Jiang

Wang

2019

J. Phys. Chem. B

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Vibrational spectroscopy provides a powerful tool to probe the structure and dynamics of nucleic acids because specific normal modes, in particular the base carbonyl stretch modes, are highly sensitive to the hydrogen bonding patterns and stacking configurations in these biomolecules. In this work, we develop vibrational frequency maps for the C=O and C=C stretches in nucleobases that allow the calculations of their site frequencies directly from molecular dynamics simulations. We assess the frequency maps by applying them to nucleobase derivatives in aqueous solutions and nucleosides in organic solvents, and demonstrate that the predicted infrared spectra are in good agreement with experimental measurements. The frequency maps can be readily used to model the linear and non-linear vibrational spectroscopy of nucleic acids and elucidate the molecular origin of the experimentally observed spectral features.

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Section: Vibrational Frequency Maps For the Nucleobase C=o Stretchesmentioning

confidence: 99%

mentioning

confidence: 99%

Development of Vibrational Frequency Maps for Nucleobases

Jiang

Wang

2019

J. Phys. Chem. B

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“…Generic ECMs irrespective of unit cell's geometry have not been presented yet. Alternatively, all-dielectric cascaded metasurfaces can achieve multi-band, multi-functional polarization controllers [29], [30]. Such low-loss topologies are very attractive but in general thicker than cascades of patterned metallic surfaces.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band, Orthogonally-Polarized LP-to-CP Converter for SatCom Applications

Mastro¹,

Ettorre²,

Grbic³

2020

IEEE Trans. Antennas Propagat.

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A systematic design of dual-band, orthogonallypolarized linear-to-circular polarization (LP-to-CP) converters is proposed. This class of polarization converters can transform linearly-polarized waves into right-and left-hand circularlypolarized (RHCP and LHCP) waves in two separate non-adjacent frequency bands. The reported polarizer is made of three cascaded bianisotropic sheet admittances, spaced by two isotropic dielectric slabs. The electromagnetic problem is studied by means of impedance boundary conditions. A transmission-matrix analysis of periodically-loaded transmission-lines is employed in design. An analytic model is developed and closed-form expressions are derived for the frequency response of each sheet admittance. This method avoids the use of multi-parameter optimization procedures. An example of a dual-band, orthogonally-polarized LP-to-CP converter is proposed for satellite communication applications in the K/Ka-band. The polarizer separately performs LP-to-LHCP and LP-to-RHCP conversions over the transmitting and receiving channels of the K/Ka-band. The design is validated with a prototype. Under normal incidence, the polarizer exhibits axial ratios (ARs) lower than 3 dB over the 18-22.2 GHz (∼21%) and 28.7-30.4 GHz (∼6%) bands. The total transmission is above-1 dB within the same two bands. The performance is stable for scanning angles up to ±45 •. For a 45 • angle of incidence, the AR is lower than 3 dB in the bands 17-22 GHz (∼25.6%) and 28.6-30 GHz (∼4.7%) with a total transmission higher than-1.2 dB.

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“…While numerous efficient semianalytical macroscopic design methods were developed in recent years (e.g., [4,7,8,14,33,34]), allowing conceptual implementation of advanced field transformations via metasurfaces, translating the latter into physical structures remains a significant challenge. Most of the microscopic design schemes rely on full-wave numerical simulations to associate a given subwavelength structure with its equivalent meta-atom constituents, yielding a lookup table that is utilized for general metasurface realization.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Properties of Metagratings via a Detailed Analytical Model for Synthesis and Analysis

2017

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We present detailed analytical modelling and in-depth investigation of wide-angle reflect-mode metagrating beam splitters. These recently introduced ultrathin devices are capable of implementing intricate diffraction engineering functionalities with only a single meta-atom per macro-period, making them considerably simpler to synthesize than conventional metasurfaces. We extend upon recent work and focus on electrically-polarizable metagratings, comprised of loaded conducting wires in front of a perfect elecric conductor, excited by transverse-electric polarized fields, which are more practical for planar fabrication. The derivation further relates the metagrating performance parameters to the individual meta-atom load, facilitating an efficient semianalytical synthesis scheme to determine the required conductor geometry for achieving optimal beam splitting. Subsequently, we utilize the model to analyze the effects of realistic conductor losses, reactance deviations, and frequency shifts on the device performance, and reveal that metagratings feature preferable working points, in which the sensitivity to these non-idealities is rather low. The analytical relations shed light on the physical origin of this phenomenon, associating it with fundamental interference processes taking place in the device. These results, verified via full-wave simulations of realistic physical structures, yield a set of efficient engineering tools, as well as profound physical intuition, for devising future metagrating devices, with immense potential for microwave, terahertz, and optical beam-manipulation applications.

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Analysis and synthesis of cascaded metasurfaces using wave matrices

Cited by 35 publications

References 23 publications

Development of Vibrational Frequency Maps for Nucleobases

Development of Vibrational Frequency Maps for Nucleobases

Dual-Band, Orthogonally-Polarized LP-to-CP Converter for SatCom Applications

Unveiling the Properties of Metagratings via a Detailed Analytical Model for Synthesis and Analysis

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