Real-Space Mapping of the Chiral Near-Field Distributions in Spiral Antennas and Planar Metasurfaces

Schnell, Martin; Sarriugarte, Paulo; Neuman, Tomáš; Khanikaev, Alexander B.; Shvets, Gennady; Aizpurua, Javier; Hillenbrand, Rainer

doi:10.1021/acs.nanolett.5b04416

Cited by 75 publications

(68 citation statements)

References 61 publications

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“…[95][96][97] However, some geo metrically chiral structures presented little CD signal in both nearfield and farfield under the illumination of LCP and RCP (upper part of Figure 4b). [93] Recently, experimental observation of chiral nearfield dis tributions has been achieved by a scatteringtype scanning nearfield optical microscopy method (SNOM) under the [77] Copyright 2012, American Physical Society. b) Schematic view of left-and right-handed structures composed of chiral gold shell covering on achiral ZnO nanopillar.…”

Section: Quasi-2d Periodic Chiral Nanostructuresmentioning

confidence: 99%

See 1 more Smart Citation

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

162

122

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(circular birefringence) and absorption losses (circular dichroism) with the circu larly polarized light (CPL) illumination. [10] CB arises from the difference in the real part of refractive index, leading to a dif ferent velocity for LCP and RCP compo nents, and thus results in the polarization rotation of the linearly polarized incident light. CD corresponds to the difference in the imaginary part of refractive index, resulting in a distinct absorption loss for LCP and RCP excitations. Besides the con ventional CD and CB, asymmetric trans mission (circular conversion dichroism) is another fundamental chiroptical pheno menon, which exists in the nondiffracting array, referring to different LCPtoRCP and RCPtoLCP conversion efficiencies. [11] All of these chiroptical phenomena have been successfully applied in the spectros copy for identifying special arrangements of chiral matters in biology, chemistry and physics as efficient diagnostic tools. [12][13][14][15][16] However, the chirop tical response in natural chiral materials is relatively weak due to the small electromagnetic (EM) interaction volume, [17] hence limits its further applications.Recent progress in plasmonics paves the way for the enhancement of chiroptical response. [18][19][20] Surface plasmons (SPs), as the collective electrons oscillation at the dielectric and metal interface, [21][22][23] present the capacity of light confine ment and field enhancement, which significantly improve the strength of lightmatter interactions. [24][25][26][27][28] With the uptodate nanofabrication technology, the study field of chirality has been extended from traditional chiral molecules to 3D metallic nanostructures. [29][30][31][32] Chiroptical responses of metallic meta molecules have been widely investigated, [33][34][35] and applied in various fields, such as biosensing, [36] chiral catalysis, [37] polari zation tuning, [38] and chiral photo detection.[39] The 3D metallic structure exhibited giant optical activity response because of the strong interaction between electric and magnetic resonant modes. [40,41] Different from 3D chiral ensembles, planar chiral structures show none chiral effect, as they can always coincide with their mirror images. However, 2D chirality was successfully found in the quasitwodimensional (quasi2D) chiral structure. [42] Moreover, recent reports show that even achiral nanomaterials have the ability to generate strong CD under an oblique CPL illumination. [43] This kind of extrinsic chirality arises from sym metry breaking of the incident light and the quasi2D material, which is quite different from the intrinsic chirality of 3D chiral The plasmonic chiroptical effect has been used to manipulate chiral states of light, where the strong field enhancement and light localization in metallic nanostructures can amplify the chiroptical response. Moreover, in metamaterials, the chiroptical effect leads to circular dichroism (CD), circular birefringence (CB), and asymmetric transmission. Potential applications enabled by chiral plasmonics...

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Section: Quasi-2d Periodic Chiral Nanostructuresmentioning

confidence: 99%

Section: Quasi-2d Periodic Chiral Nanostructuresmentioning

confidence: 99%

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

162

122

View full text Add to dashboard Cite

show abstract

“…However, the methods of signal analysis and interpretation of s-SNOM data require detailed attention [8,9]. In past years, modifications to the basic s-SNOM setup have been reported, such as the so-called phase-shifting interferometry technique [10] to retrieve near-field (NF) amplitude and phase, the homodyne technique [11] to measure attenuation and propagation constants for antennas, the pseudoheterodyne technique [12] to enhance resolution and contrast in subsurface NF microscopy [13] or hybridization modes in antennas [14], and, more recently, the transmission-mode s-SNOM [15,16], which involves the illumination of antennas from below using linearly or circularly polarized light. Despite the fact that these techniques successfully retrieve amplitude and phase, the analysis is mainly based on the amplitude results, leaving room for a detailed analysis of the phase maps and for an improvement in the phase retrieval techniques ranging over the [0, 2π) interval.…”

Section: Introductionmentioning

confidence: 99%

Phase imaging and detection in pseudo-heterodyne scattering scanning near-field optical microscopy measurements

Moreno¹,

Alda²,

Kinzel³

et al. 2017

Appl. Opt.

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When considering the pseudo-heterodyne mode for detection of the modulus and phase of the near field from scattering scanning near-field optical microscopy (s-SNOM) measurements, processing only the modulus of the signal may produce an undesired constraint in the accessible values of the phase of the near field. A twodimensional analysis of the signal provided by the data acquisition system makes it possible to obtain phase maps over the whole [0, 2π) range. This requires post-processing of the data to select the best coordinate system in which to represent the data along the direction of maximum variance. The analysis also provides a quantitative parameter describing how much of the total variance is included within the component selected for calculation of the modulus and phase of the near field. The dependence of the pseudo-heterodyne phase on the mean position of the reference mirror is analyzed, and the evolution of the global phase is extracted from the s-SNOM data. The results obtained from this technique compared well with the expected maps of the near-field phase obtained from simulations.

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“…Chiral plasmonic nanostructures and chiral metasurfaces, especially 3D ones possess unique chiroptical properties . They are very useful for applications in chiral optics, chiral sensing, and optical manipulation of chiral objects .…”

mentioning

confidence: 99%

“…Chiral plasmonic nanostructures [1][2][3][4][5][6][7][8] and chiral metasurfaces, [9][10][11][12][13][14] especially 3D ones possess unique chiroptical properties. [15][16][17][18] They are very useful for applications in chiral optics, [1,2,5,[19][20][21][22][23][24][25] chiral sensing, [26][27][28][29][30][31] and optical manipulation of chiral objects.…”

mentioning

confidence: 99%

Stress‐Induced 3D Chiral Fractal Metasurface for Enhanced and Stabilized Broadband Near‐Field Optical Chirality

Tseng

Lin

Kuo

et al. 2019

Advanced Optical Materials

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Metasurfaces comprising 3D chiral structures have shown great potential in chiroptical applications such as chiral optical components and sensing. So far, the main challenges lie in the nanofabrication and the limited operational bandwidth. Homogeneous and localized broadband near‐field optical chirality enhancement has not been achieved. Here, an effective nanofabrication method to create a 3D chiral metasurface with far‐ and near‐field broadband chiroptical properties is demonstrated. A focused ion beam is used to cut and stretch nanowires into 3D Archimedean spirals from stacked films. The 3D Archimedean spiral is a self‐similar chiral fractal structure sensitive to the chirality of light. The spiral exhibits far‐ and near‐field broadband chiroptical responses from 2 to 8 µm. With circularly polarized light (CPL), the spiral shows superior far‐field transmission dissymmetry and handedness‐dependent near‐field localization. With linearly polarized excitation, homogeneous and highly enhanced broadband near‐field optical chirality is generated at a stably localized position inside the spiral. The effective yet straightforward fabrication strategy allows easy fabrication of 3D chiral structures with superior broadband far‐field chiroptical response as well as strongly enhanced and stably localized broadband near‐field optical chirality. The reported method and chiral metasurface may find applications in broadband chiral optics and chiral sensing.

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Real-Space Mapping of the Chiral Near-Field Distributions in Spiral Antennas and Planar Metasurfaces

Cited by 75 publications

References 61 publications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Phase imaging and detection in pseudo-heterodyne scattering scanning near-field optical microscopy measurements

Stress‐Induced 3D Chiral Fractal Metasurface for Enhanced and Stabilized Broadband Near‐Field Optical Chirality

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