Generation of a Nondiffracting Superchiral Optical Needle for Circular Dichroism Imaging of Sparse Subdiffraction Objects

Hu, Haifeng; Gan, Qiaoqiang; Zhan, Qiwen

doi:10.1103/physrevlett.122.223901

Cited by 54 publications

(41 citation statements)

References 36 publications

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“…Both directions can benefit from theoretical studies of local superchiral fields. [ 204 ] Finite‐difference‐time‐domain (FDTD) simulation provides a powerful toolbox to understand the physical origins of the CD spectra for individual NPs and NP assemblies. By comparative analysis of experimental and simulated CD and g ‐factor spectra, the effects of symmetry‐breaking and geometrical parameters on chiroptical activities of chiral nanoceramics could be understood and then guide the synthesis of chiral ceramic nanostructures.…”

Section: Summary and Future Prospectsmentioning

confidence: 99%

Chiral Nanoceramics

Fan

Kotov

2020

Advanced Materials

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Jinchen Fan received his Ph.D. degree from Shanghai Jiao Tong University in 2014. He is now an associate professor at Shanghai University of Electric Power, China. He joined Prof. Kotov's group as a visiting scholar from October 2017 to October 2019. His current research focus is on the fabrication of chiral nanoceramics and their applications in chiroptical activity and catalysis. 2.2. Chiral Assemblies and Soft Templates Most of organic amphiphiles can be assembled into chiral superstructures. [43] This series of superstructures can be used as soft templates in the preparation of helical ceramic nanomaterials including, SiO 2 , [44] Ta 2 O 5 , [45] TiO 2 , [46] ZrO 2 , [47] and poly(bi ssilsesquioxane) [48] via the sol-gel transcription approach. Similarly, bio-macromolecules, such as peptides and DNA can serve as templates for realizing chiral ZnO [49] and silica structures. [50] Chiral synthesis with sodium cholate (SC) also serves as a representative example of this method. Because of its amphiphilic character, SC self-assembles into a unique bilayer structure through the hydrogen bonding between hydroxyl groups. [51] Huang and co-workers [51b] used the SC assembled via coordination with calcium ions, well-defined helical nanoribbons for creating additional helical SiO 2 and ZnS by sol-gel process. Methods of chirality transfer from soft templates often include self-organization ceramic building blocks based on hydrogen bonding, van der Waals forces, π-π stacking, hydrophobic effect, electrostatic and Coulomb interactions, and metal coordination. [41] One of representative examples of chiral assembly is the preparation of chiral nanostructured silica that proceeds via Nicholas A. Kotov pioneered conceptual foundations and technical realizations of biomimetic nanostructures, which include chiral nanomaterials. Chiral ceramic nanostructures are being investigated in his laboratory for optical, magnetic, biological, and catalytic properties. His contribution to technology include nacremimetic nanocomposites including those from graphene oxide, 3D tissue replicas for drug-testing, chiral biosensors, and cartilage-like electrolytes for batteries. He is a founder of several start-up companies that commercialized bioinspired nanomaterials for biomedical, energy, and automotive technologies.

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Section: Summary and Future Prospectsmentioning

confidence: 99%

Chiral Nanoceramics

Fan

Kotov

2020

Advanced Materials

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“…Besides, the main lobes of the E-and H-fields are spatially separated but complementary to each other. This proper spatially overlapped field distribution is the key to produce the superchirality of EM waves, [20,22] as will be explained below.…”

Section: Device Design For Generating Superchiral Localized Fieldmentioning

confidence: 99%

“…, [18][19][20][21][22] was introduced to describe the boosted optical response of chiral molecules under the illumination of superchiral optical field compared to their regular CD response under CPL illuminations (i.e., g/g CPL > 1, here Z 0 is the wave impedance of EM wave in the vacuum). The definition is CD = A + -A − , where A + and A − are the far-field absorption under left-and right-CPL excitation.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, it was also proposed that the chirality of the incident electromagnetic (EM) field can be enhanced by manipulating the spatial field distribution and polarization state . In particular, a “superchirality” factor,

g / g_{CPL} = \frac{Im (\overset{true\to}{E} \cdot {\overset{true\to}{H}}^{*})}{(1 / Z_{0}) {(||, \overset{E}{true})}^{2}}

, was introduced to describe the boosted optical response of chiral molecules under the illumination of superchiral optical field compared to their regular CD response under CPL illuminations (i.e., g / g CPL > 1, here Z 0 is the wave impedance of EM wave in the vacuum). The definition is CD = A + –A − , where A + and A − are the far‐field absorption under left‐ and right‐CPL excitation.…”

Section: Introductionmentioning

confidence: 99%

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Symmetric Meta‐Absorber‐Induced Superchirality

Rui

Singer

et al. 2019

Advanced Optical Materials

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Chiral light‐matter interaction in plasmonic metamaterials represents a new paradigm in optics. However, most previously reported works require structural chirality based on asymmetric three‐dimensional architectures, imposing a significant cost barrier in scalable manufacturing. Here, the generation of superchiral light‐matter interaction in symmetric metal‐dielectric‐metal (MDM) metamaterial structures is theoretically proposed. Due to the interplay of the spatially separated and enhanced electric (E‐) and magnetic (H‐) fields with complementary profiles, a superchiral localized hotspot can be generated in MDM structures when an appropriate phase condition is satisfied. By introducing chiral molecules into the spacer layer, the circular dichroism (CD) signal of the coupled system can be enhanced significantly. The origin of the enhanced CD is attributed to the inherent and induced CD signals of the coupled system, which are derived from the direct molecular CD response and the asymmetric absorption of circularly polarized light by the metallic nanostructure. It is demonstrated that the metamaterial‐induced CD response contributes dominantly to the overall CD response of the coupled system, and a 1300‐fold enhancement factor can be obtained when on‐resonance chiral molecules are adsorbed in the optical superchiral field in the spacer layer. This finding paves the way toward the development of practical and scalable platforms for new chiroptical applications.

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“…So far, many methods have been employed to modulate the polarization state of light. The most common approach uses optical chirality, where the refractive index differs for the right-and lefthanded circular polarized (RCP and LCP) light [5][6][7]. Birefringence can also transform the polarization state of the incident light based on different phase velocities of two orthogonal components of the electric field [8].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Generation of Arbitrary Assembly of Polarization States with Geometrical-Scaling-Induced Phase Modulation

et al. 2020

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Manipulating the polarization of light on the microscale or nanoscale is essential for integrated photonics and quantum optical devices. Nowadays, the metasurface allows one to build on-chip devices that efficiently manipulate the polarization states. However, it remains challenging to generate different types of polarization states simultaneously, which is required to encode information for quantum computing and quantum cryptography applications. By introducing geometrical-scaling-induced (GSI) phase modulations, we demonstrate that an assembly of circularly polarized (CP) and linearly polarized (LP) states can be simultaneously generated by a single metasurface made of L-shaped resonators with different geometrical features. Upon illumination, each resonator diffracts the CP state with a certain GSI phase. The interaction of these diffractions leads to the desired output beams, where the polarization state and the propagation direction can be accurately tuned by selecting the geometrical shape, size, and spatial sequence of each resonator in the unit cell. As an example of potential applications, we show that an image can be encoded with different polarization profiles at different diffraction orders and decoded with a polarization analyzer. This approach resolves a challenging problem in integrated optics and is inspiring for on-chip quantum information processing.

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Generation of a Nondiffracting Superchiral Optical Needle for Circular Dichroism Imaging of Sparse Subdiffraction Objects

Cited by 54 publications

References 36 publications

Chiral Nanoceramics

Chiral Nanoceramics

Symmetric Meta‐Absorber‐Induced Superchirality

Simultaneous Generation of Arbitrary Assembly of Polarization States with Geometrical-Scaling-Induced Phase Modulation

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