Chirality Switching Via Rotation of Bilayer Fourfold Meta-Structure

Hor, Yew Li; Phua, Wee Kee; Khoo, Eng Huat

doi:10.1007/s11468-016-0232-3

Cited by 7 publications

(10 citation statements)

References 18 publications

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“…To further unveil the origin of the selective absorption associated with the giant CD effect of the proposed CMSA, the electric eld (E z ) distributions of the unit-cell driven by RCP and LCP lights at 288.5 THz and 404 THz has been studied. It has been known that the excitation of surface plasmons resonance will produce oscillating dipole elds due to the semicircle nanostructure with small diameters compared with the incident wavelength of the different CP lights [48][49]. When RCP or LCP light illuminate onto the semicircle nanostructure, it can be reasonably believed that the selective absorption and giant CD effect will emerge in the proposed CMSA and consequently resutling in the different distribution of the electric eld and magnetic eld components in each layer [49][50][51][52][53][54].…”

Section: Resultsmentioning

confidence: 99%

“…It has been known that the excitation of surface plasmons resonance will produce oscillating dipole elds due to the semicircle nanostructure with small diameters compared with the incident wavelength of the different CP lights [48][49]. When RCP or LCP light illuminate onto the semicircle nanostructure, it can be reasonably believed that the selective absorption and giant CD effect will emerge in the proposed CMSA and consequently resutling in the different distribution of the electric eld and magnetic eld components in each layer [49][50][51][52][53][54]. It can be observed that the electric dipole power is much stronger than the magnetic one in the designed semicircle nanostructure, revealing the predominance of electric dipole oscillations.…”

Section: Resultsmentioning

confidence: 99%

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Plasmonic chiral metasurface absorber based on bilayer fourfold twisted semicircle nanostructure at optical frequency

Cheng

Chen

Luo

2020

Preprint

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In this paper, we present a plasmonic chiral metasurface absorber (CMSA), which can achieve the high selective absorption for right-handed and left-handed circular polarization (RCP, “+”, and LCP, “-”) lights at optical frequency. The CMSA is composed of a dielectric substrate sandwiched with bi-layer fourfold twisted semicircle metal nanostructure. The proposed CMSA has a strong selective absorption band, where absorption peaks for LCP and RCP lights occur at different resonance frequencies, reflecting the existence of a significant circular dichroism (CD) effect. It is shown that the absorbance of the CMSA can reach to 93.2% for LCP light and 91.6% for RCP light, and that the maximum CD magnitude is up to 0.85 and 0.91 around 288.5 THz and 404 THz, respectively. The mechanism of the strong chiroptical response of the CMSA is illustrated by electric fields distributions of the unit-cell nanostructure. Furthermore, the influence of the geometry of the proposed CMSA on the circular polarization selective absorption characterization is studied systematically.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Plasmonic chiral metasurface absorber based on bilayer fourfold twisted semicircle nanostructure at optical frequency

Cheng

Chen

Luo

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…4(b To further unveil the origin of the chiral-selective absorption associated with the giant CD effect of the proposed PMSA, we studied the electric eld (E z ) distributions of the unit-cell driven by the incident RCP and LCP lights at 288.5 THz and 404 THz, respectively. The excitation of surface plasmons resonance will produce oscillating dipole elds due to the semicircle nanostructure with small diameters relative to the incident wavelength of the different CP lights [43][44][45][46]. When RCP or LCP light excites the semicircle nanostructure, a chiral-selective absorption and giant CD effect will occur, and the electric eld and magnetic eld components of each layer are different due to the chirality [46][47][48][49][50][51].…”

Section: Resultsmentioning

confidence: 99%

“…The chiral-selective absorption and giant CD effect will be generated at resonance frequencies owing to the obvious dipole power difference under LCP and RCP excitation. Here, we use a simpli ed method with equivalent electric dipole moments, which considers the charge vibrations of four semicircle nanostructure per layer to one dipole vibration [46][47][48]. According to Born-Kuhn theory model [48,49], when the mode is hybridized from two dipoles with the same electric eld direction, namely bonding mode, while the one is hybridized from two dipoles with 90° or cross direction, known as antibonding mode.…”

Section: Resultsmentioning

confidence: 99%

Chiral-selective Plasmonic Metasurface Absorber Based on Bilayer Fourfold Twisted Semicircle Nanostructure at Optical Frequency

Cheng

Chen

Luo

2020

Preprint

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In this paper, we demonstrate theoretically a plasmonic metasurface absorber (PMSA) for the high chiral-selective absorption for right-handed and left-handed circular polarization (RCP and LCP) lights at optical frequency. The PMSA is composed of a dielectric substrate sandwiched with bi-layer fourfold twisted semicircle nanostructure. Numerical simulation results that the proposed PMSA has a strong chiral selective absorption bands, where absorption peaks for LCP and RCP lights occur at different resonance frequencies resulting in significant circular dichroism (CD) effect. It is shown that the maximum absorbance of the PMSA can reach to 93.2% for LCP light and 91.6% for RCP light, and that the maximum CD magnitude is about 0.85 and 0.91 around 288.5 THz and 404 THz, respectively. The mechanism of the strong chiroptical response of the PMSA is illustrated and revealed by electric fields distributions. Furthermore, the influence of the geometry of the proposed PMSA on the chiral-selective absorption characterization is studied systematically. Due to the strong chiral-selective absorption and CD effect, the proposed PMSA can be found many potential applications in some areas, such as chiral imaging, optical filters, detecting, and optical communications.PACS numbers: 42.25.Bs, 78.20.−e

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“…Instead of analyzing the torque directly using numerical calculations, we offer a simpler alternative by looking at the charge distribution profiles, which can be analyzed to predict the CD signature formed [11][12][13][14][15][16]. The chirality [17][18][19] can then be used to predict the torque.…”

Section: Introductionmentioning

confidence: 99%

Optical alignment of achiral nanoparticles via the use of induced chiral force

2020

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A chiral force was found to be induced upon rotation of planar nanoparticles under irradiation of linearly polarized light. The chiral force arises due to differing absorptions of left and right circularly polarized light, correlating with the circular dichroism (CD) of rotated nanoparticle. Charge distribution profiles, which arises from the excited localized surface plasmon polaritons induced by the light, can be used to predict the CD. This offers a simple method of using charge distributions to predict the dynamics of nanoparticles for optical alignment and orientation in the fabrication of various optical devices.

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Chirality Switching Via Rotation of Bilayer Fourfold Meta-Structure

Cited by 7 publications

References 18 publications

Plasmonic chiral metasurface absorber based on bilayer fourfold twisted semicircle nanostructure at optical frequency

Plasmonic chiral metasurface absorber based on bilayer fourfold twisted semicircle nanostructure at optical frequency

Chiral-selective Plasmonic Metasurface Absorber Based on Bilayer Fourfold Twisted Semicircle Nanostructure at Optical Frequency

Optical alignment of achiral nanoparticles via the use of induced chiral force

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