Magnetic field modulation of chirooptical effects in magnetoplasmonic structures

Armelles, G.; Caballero, Blanca; Prieto, Patricia; García, Fernando; Cebollada, A.; González, María Ujué; García‐Martín, Antonio

doi:10.1039/c3nr05889a

Cited by 39 publications

(49 citation statements)

References 35 publications

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“…Finally, in Figure 4f, we also simulated the magnetic component of the extrinsic chirality, which was also about an order of magnitude higher compared to previous reports. 10,26 Therefore, the large tuning range of the OC by magnetic fields makes our device potentially useful for active chiral photonic device applications. Figure 5b shows the reflectivity spectra of the hole area and bare multilayer thin films.…”

Section: Resultsmentioning

confidence: 99%

“…27,28 Compared to other mechanisms, modulation of the optical chirality using magnetic fields shows advantages of high speed, low power consumption, continuous tunablity and ease for integration. 10,26 For instance, a far field CD modulation amplitude up to 150% is observed in an Au-Au-Ni trimer chiral plasmonic device. 26 However, the weak magneto-optical effect and strong optical absorption in ferromagnetic metals limited the modulation efficiency.…”

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confidence: 99%

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Switching the Optical Chirality in Magnetoplasmonic Metasurfaces Using Applied Magnetic Fields

et al. 2020

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Chiral nanophotonic devices are promising candidates for chiral molecules sensing, polarization diverse nanophotonics and display technologies. Active chiral nanophotonic devices, where the optical chirality can be controlled by an external stimulus has triggered great research interest.However, efficient modulation of the optical chirality has been challenging. Here, we demonstrate switching of the extrinsic chirality by applied magnetic fields in a magneto-plasmonic metasurface device based on a magneto-optical oxide material, Ce1Y2Fe5O12 (Ce:YIG). Thanks to the low optical loss and strong magneto-optical effect of Ce:YIG, we experimentally demonstrated a giant and continuous far-field circular dichroism (CD) modulation by applied magnetic fields from -0.65° to +1.9° at 950 nm wavelength under glancing incident conditions. The far field CD modulation is due to both magneto-optical circular dichroism and near-field modulation of the superchiral fields by applied magnetic fields. Finally, we demonstrate magnetic field tunable chiral imaging in millimeter-scale magneto-plasmonic metasurfaces fabricated using self-assembly. Our results 2 provide a new way for achieving planar integrated, large-scale and active chiral metasurfaces for polarization diverse nanophotonics. KEYWORDS: Magnetoplasmonic, Metasurface, Optical Chirality, Magneto-optical effectChirality describes the symmetry property of a structure, that its mirror image cannot be superimposed with itself through translation and rotation operations, like our two hands. The chirality of biomolecules is universal in our living body, such as amino acid and proteins, which has significance in biomolecules recognition. 1,2 However, the chiroptical signal of chiral biomolecules is very weak. Recently, chiral plasmonic 3,4 and all dielectric structures 5,6 with large chiroptical response have attracted great research interest. Benefitted from advanced nano-fabrication technologies, 3D or planar chiroptical nanostructures, such as helices, 7,8 shurikens, 9 gammadions, 6,10 and twisted split-rings 11 have been fabricated. On the other hand, extrinsic chirality can also be observed in achiral photonic nanostructures under obliquely incidence conditions. The extrinsic chirality is originated from asymmetric distributions of electromagnetic fields, i.e. the electromagnetic near field distribution is chiral. 12 Nanophotonic structures such as nanoholes, 12 squares 13 and split ring resonators 14,15 showed large extrinsic chirality. For instance, Ben et al.demonstrated a ~4 times stronger optical chirality in achiral periodic nanoholes compared to the gammadion structure. 12 Recently, Abraham et. al. experimentally demonstrated that the achiral nanohole structures can also show superchiral near-fields even at perpendicular incidence conditions. 16 In that case, the far-field circular dichroism (CD) background signals from the plasmonic structures is eliminated, improving the sensitivity for chiral molecule sensing applications. These reports demonstrate a promising potent...

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Section: Resultsmentioning

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Switching the Optical Chirality in Magnetoplasmonic Metasurfaces Using Applied Magnetic Fields

et al. 2020

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“…19,20 Moreover, theoretical works on magneto-chiral structures have predicted exciting phenomena, such as, nonreciprocal dispersion relation or backwards wave propagating eigenmodes, with potential for the use in telecom applications. 21,22,23,24,25,26,27,28,29,30 Within this context, exploring novel systems that exploit the strong relationship between MO activity and chirality is of obvious interest.…”

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Interaction Effects between Magnetic and Chiral Building Blocks: A New Route for Tunable Magneto-chiral Plasmonic Structures

et al. 2015

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We propose a novel active magneto-chiral system consisting of a separated Au/Co multilayer with perpendicular magnetic anisotropy and plasmonic chiral oligomers. The electromagnetic interaction between the Au/Co multilayer and chiral building blocks, which is governed by their separation distance, plays a relevant role in the control of both magneto-optical and chiral activity, resulting in a strong effect on the chiro-optical response. Due to the interaction-induced detuning of the disk resonances in the oligomers, the chiro-optical activity decreases with increasing interaction strength. The possibility to tune both magneto- and chiro-optical properties of the system by controlling the interaction strength opens the door for the fabrication of magneto-chiral systems in a wide spectral range, which is determined by both constituting magnetic and chiral components, as well as their electromagnetic interaction.

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“…chiral patterns) and the possibility of an intrinsically chiralg old core (i.e.,g old atoms packedi nac hiral fashion). The second method is to directly fabricatec hiral nanostructures by templated deposition or growth, [44,45,53] and the third is to assemble achiral Au nanoparticles into chiral assemblies (e.g.,d iscrete oligomers of nanoparticleso rl arge-scale assemblies) with the aid of chiral templates. The first methodi st of unctionalize Au nanoparticles (including nanoclusters) with chiral ligands, and thus the resultant nanoparticles become chiral, [49][50][51][52] but it remains unclear whethert he chiral ligands induce ac hiral arrangement of gold atomst hrough reconstruction.…”

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confidence: 99%

“…The first methodi st of unctionalize Au nanoparticles (including nanoclusters) with chiral ligands, and thus the resultant nanoparticles become chiral, [49][50][51][52] but it remains unclear whethert he chiral ligands induce ac hiral arrangement of gold atomst hrough reconstruction. The second method is to directly fabricatec hiral nanostructures by templated deposition or growth, [44,45,53] and the third is to assemble achiral Au nanoparticles into chiral assemblies (e.g.,d iscrete oligomers of nanoparticleso rl arge-scale assemblies) with the aid of chiral templates. [54][55][56][57][58][59][60][61][62][63] Herein, we focus on the chirality of atomically precise gold nanoclusters, which have emerged as an ew class of nanomaterial and exhibit intriguing chiral properties.…”

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Chiral Gold Nanoclusters: Atomic Level Origins of Chirality

Zeng

Jin

2017

Chemistry An Asian Journal

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Chiral nanomaterials have received wide interest in many areas, but the exact origin of chirality at the atomic level remains elusive in many cases. With recent significant progress in atomically precise gold nanoclusters (e.g., thiolate-protected Au (SR) ), several origins of chirality have been unveiled based upon atomic structures determined by using single-crystal X-ray crystallography. The reported chiral Au (SR) structures explicitly reveal a predominant origin of chirality that arises from the Au-S chiral patterns at the metal-ligand interface, as opposed to the chiral arrangement of metal atoms in the inner core (i.e. kernel). In addition, chirality can also be introduced by a chiral ligand, manifested in the circular dichroism response from metal-based electronic transitions other than the ligand's own transition(s). Lastly, the chiral arrangement of carbon tails of the ligands has also been discovered in a very recent work on chiral Au (SR) and Au (SR) nanoclusters. Overall, the origins of chirality discovered in Au (SR) nanoclusters may provide models for the understanding of chirality origins in other types of nanomaterials and also constitute the basis for the development of various applications of chiral nanoparticles.

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Magnetic field modulation of chirooptical effects in magnetoplasmonic structures

Cited by 39 publications

References 35 publications

Switching the Optical Chirality in Magnetoplasmonic Metasurfaces Using Applied Magnetic Fields

Switching the Optical Chirality in Magnetoplasmonic Metasurfaces Using Applied Magnetic Fields

Interaction Effects between Magnetic and Chiral Building Blocks: A New Route for Tunable Magneto-chiral Plasmonic Structures

Chiral Gold Nanoclusters: Atomic Level Origins of Chirality

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