Quasi-guided modes resulting from the band folding effect in a photonic crystal slab for enhanced interactions of matters with free-space radiations

• Kaili Sun,
• Yangjian Cai,
• Uriel Levy and
• Zhanghua Han

Beilstein J. Nanotechnol. 2023, 14, 322–328, doi:10.3762/bjnano.14.27

• optical applications where multiple or spectrally tunable inputs are required simultaneously. Consequently, new mechanisms are still explored to realize novel photonic components with additional advantages besides a high Q-factor. These are, for example, phase gradient metasurfaces and spatial beam

• splitters [11], metasurfaces that produce narrow-band spatially tailored wave fronts [12], and zigzag arrays of dielectric disks with ultranarrow bandwidth resonances over a large spectral band [13]. Some new attempts to engineer the radiation environment to achieve so-called lines of BICs have emerged

Double-layer symmetric gratings with bound states in the continuum for dual-band high-Q optical sensing

• Chaoying Shi,
• Jinhua Hu,
• Xiuhong Liu,
• Junfang Liang,
• Jijun Zhao,
• Haiyan Han and
• Qiaofen Zhu

Beilstein J. Nanotechnol. 2022, 13, 1408–1417, doi:10.3762/bjnano.13.116

• infinite structure or in extreme values of the parameters [25][26]. The structures that are commonly used to induce the BIC include metasurfaces [27][28], dielectric gratings [29][30], photonic crystals [31], and whispering-gallery resonators [32]. In 2016, Wang et al. investigated a symmetry-protected BIC

A super-oscillatory step-zoom metalens for visible light

• Yi Zhou,
• Chao Yan,
• Peng Tian,
• Zhu Li,
• Yu He,
• Bin Fan,
• Zhiyong Wang,
• Yao Deng and
• Dongliang Tang

Beilstein J. Nanotechnol. 2022, 13, 1220–1227, doi:10.3762/bjnano.13.101

• the device’s ability to modulate the optical field effectively, which, in turn, limits the performance of super-oscillatory lenses (e.g., efficiency and large sidelobe). The development of metasurfaces has provided an effective approach to modulating amplitude, phase, and polarization of the optical

• field at the subwavelength scale [16][17][18][19][20][21][22]. Compared with metallic metasurfaces, all-dielectric metasurfaces are characterized by high amplitude transmittance, which is important for super-oscillatory lenses with comparatively low focusing efficiency. Generally, for all-dielectric

• metasurfaces, the larger the refractive index of the material is, the higher the efficiency will be. Meanwhile, a material with a high refractive index is also beneficial to reduce the aspect ratio of a metasurface device. Therefore, for various optical wavebands, a medium with a high refractive index and low

Ideal Kerker scattering by homogeneous spheres: the role of gain or loss

• Qingdong Yang,
• Weijin Chen,
• Yuntian Chen and
• Wei Liu

Beilstein J. Nanotechnol. 2022, 13, 828–835, doi:10.3762/bjnano.13.73

• scarcity of magnetic materials, especially at the high-frequency spectral regimes. In the past decade, thanks to the explosive developments of metamaterials and metasurfaces, the underlying core concept of optically induced magnetism in non-magnetic structures has invigorated and completely transformed

Tunable high-quality-factor absorption in a graphene monolayer based on quasi-bound states in the continuum

• Jun Wu,
• Yasong Sun,
• Feng Wu,
• Biyuan Wu and
• Xiaohu Wu

Beilstein J. Nanotechnol. 2022, 13, 675–681, doi:10.3762/bjnano.13.59

• previously also can be employed to enhance the absorption in graphene monolayers [51][52][53][54]. However, in the above works, the quasi-BICs are quite sensitive to the geometric parameters, which limit their practical applications. Besides, in [51][52][53], the proposed structures are metasurfaces, which

Morphology-driven gas sensing by fabricated fractals: A review

• Vishal Kamathe and
• Rupali Nagar

Beilstein J. Nanotechnol. 2021, 12, 1187–1208, doi:10.3762/bjnano.12.88

• Plasmonic Metasurfaces for Selective and Sensitive Optical Sensing of Volatile Compounds”, Advanced Materials, with permission from John Wiley & Sons. Copyright © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This content is not subject to CC BY 4.0. TiO2 fractals on candle soot templates. SEM images of

Multiple Fano resonances with flexible tunablity based on symmetry-breaking resonators

• Xiao bin Ren,
• Kun Ren,
• Ying Zhang,
• Cheng guo Ming and
• Qun Han

Beilstein J. Nanotechnol. 2019, 10, 2459–2467, doi:10.3762/bjnano.10.236

• photoswitches [8]. Various structures have been designed to realize Fano resonances, including metallic nanoclusters [9][10], individual plasmonic dolmen nanocavity [11], ring/disk cavities [12][13], and metamaterials and metasurfaces [14][15][16]. In particular, as an important geometry, waveguide–cavity

Precise local control of liquid crystal pretilt on polymer layers by focused ion beam nanopatterning

• Maxim V. Gorkunov,
• Irina V. Kasyanova,
• Vladimir V. Artemov,
• Alena V. Mamonova and
• Serguei P. Palto

Beilstein J. Nanotechnol. 2019, 10, 1691–1697, doi:10.3762/bjnano.10.164

• : The possibility of nanofabrication of polymer substrates supporting an arbitrary (from planar to vertical) spatially inhomogeneous liquid crystal alignment opens up prospects of “imprinting” electrically tunable versatile metasurfaces constituting lenses, prisms and q-plates. Keywords: focused ion

• appropriate polarized optical interference patterns, induce planar LC alignment with the director rotating within the substrate plane. Recently, we have reported on LC metasurfaces formed due to local transformation of polymer–LC anchoring from planar to vertical by focused ion beam (FIB) [31]. While the

• layer. As we have recently shown [31][32], such layers being thicker when modulated with larger periodicity represent metasurfaces potentially hosting many interesting optical phenomena. In the present case, however, the smaller periods of 1–2 μm are deliberately chosen to minimise their optical

Silencing the second harmonic generation from plasmonic nanodimers: A comprehensive discussion

• Jérémy Butet,
• Gabriel D. Bernasconi and
• Olivier J. F. Martin

Beilstein J. Nanotechnol. 2018, 9, 2674–2683, doi:10.3762/bjnano.9.250

• [18], the properties of which are different from those of typical nanoantennas, resulting in different SH source distributions. The present discussion provides new directions for the design of efficient nanosources of SH light and meta-atoms for the fabrication of nonlinear metasurfaces [44][45][46

Light–Matter interactions on the nanoscale

• Mohsen Rahmani and
• Chennupati Jagadish

Beilstein J. Nanotechnol. 2018, 9, 2125–2127, doi:10.3762/bjnano.9.201

• in the engineering of light behaviour at the nanoscale. Among various applications of dielectric nanostructures, metasurfaces, composed of a single or a few stacked layers of subwavelength nanostructures/particles, are growing in popularity [14]. This is because metasurfaces can offer a diverse range

High-contrast and reversible scattering switching via hybrid metal-dielectric metasurfaces

• Jonathan Ward,
• Khosro Zangeneh Kamali,
• Lei Xu,
• Guoquan Zhang,
• Andrey E. Miroshnichenko and
• Mohsen Rahmani

Beilstein J. Nanotechnol. 2018, 9, 460–467, doi:10.3762/bjnano.9.44

• , Nankai University, Tianjin 300457, China School of Engineering and Information Technology, University of New South Wales at the Australian Defence Force Academy, Canberra, ACT 2600, Australia 10.3762/bjnano.9.44 Abstract Novel types of optical hybrid metasurfaces consist of metallic and dielectric

• intensity of third harmonic light can be obtained for this system, via heating. This hybrid metasurface can find a wide range of applications in slow light, nonlinear optics and bio-chemical sensing. Keywords: dielectrics; directionality; metasurfaces; Mie resonance; plasmonics; reversible tuning

• ; Introduction Metasurfaces are thin and flat surfaces that are created using subwavelength optical antennas with various optical properties patterned at interfaces [1][2], enabling control over the polarization, phase, amplitude, and dispersion of light. Metasurfaces are growing in popularity as their optical