Investigations on the optical forces from three mainstream optical resonances in all-dielectric nanostructure arrays

• Guangdong Wang and
• Zhanghua Han

Beilstein J. Nanotechnol. 2023, 14, 674–682, doi:10.3762/bjnano.14.53

• manipulation of nanoparticles by optical forces. It is important to use low-power lasers to achieve efficient trapping and avoid any harmful heating effects. Keywords: all-dielectric nanostructures; anapole; optical force; quasi-bound states in the continuum; toroidal dipole; Introduction Optical forces have

• may generate a detrimental effect to the captured particles. In this context, all-dielectric nanostructures made from lossless materials are preferable to be used. With the possibility to support various types of electromagnetic resonances (e.g., toroidal dipole (TD), anapole, or bound state in the

• continuum (BIC)) which are current in focus nanophotonics research topics, all-dielectric nanostructures have proved themselves to be a good platform for light–matter interactions and an advantageous alternative to their plasmonic counterparts. A TD resonance is produced by the flow of electric currents on

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

• . Plasmonic nanoantennas [3], although with relatively low Q-factors resulting from material dissipation, still provide a large level of field enhancement due to the deep-subwavelength level of mode confinement. As new alternatives to plasmonic nanostructures, all-dielectric nanostructures supporting Mie

• have been demonstrated in all aspects of light–matter interactions, ranging from optical generation [6], propagation [7], nonlinear processes [8] to signal detection [9] and collection, to name a few. Although QBIC resonances in all-dielectric nanostructures have become a popular and mainstream

Numerical study on all-optical modulation characteristics of quantum cascade lasers

• Biao Wei,
• Haijun Zhou,
• Guangxiang Li and
• Bin Tang

Beilstein J. Nanotechnol. 2022, 13, 1011–1019, doi:10.3762/bjnano.13.88

• physics in QCL’s gain medium which consists of multiple of dielectric nanostructures with high refractive index under light injection, we modified the 1½-period model to calculate values of electron population and lifetime in each subband which is separated by the nanostructures, optical gain, current and

• optimizing its use and dielectric nanostructure design. Keywords: all-optical modulation; dielectric nanostructures; high refractive index materials; numerical study; quantum cascade lasers; Introduction The quantum cascade laser (QCL) was invented nearly 30 years ago [1], and its cavity consists of

Metal–dielectric hybrid nanoantennas for efficient frequency conversion at the anapole mode

• Valerio F. Gili,
• Lavinia Ghirardini,
• Davide Rocco,
• Giuseppe Marino,
• Ivan Favero,
• Iännis Roland,
• Giovanni Pellegrini,
• Lamberto Duò,
• Marco Finazzi,
• Luca Carletti,
• Andrea Locatelli,
• Aristide Lemaître,
• Dragomir Neshev,
• Costantino De Angelis,
• Giuseppe Leo and
• Michele Celebrano

Beilstein J. Nanotechnol. 2018, 9, 2306–2314, doi:10.3762/bjnano.9.215

• dielectric nanostructures reported in our early work corresponds to a strong scattering regime, the anapole mode is weakly coupled to radiating modes, therefore it cannot be efficiently excited by far-field illumination. This results in a low field enhancement averaged inside the structure, F (blue line in

• SHG emission as a function of the pump polarization and angular emission of the SHG reveal that the plasmonic ring increases the pump in-coupling as well as the emission out-coupling. These results represent a step forward in the optimization of nonlinear light manipulation in dielectric

• nanostructures. The possibility to effectively enhance SHG using the anapole mode field distribution boosted by a plasmonic nanoantenna opens up new avenues for nonlinear sensing, spectroscopy as well as frequency down-conversion and nonlinear multiplexing at the nanoscale [8]. Experimental Sample fabrication

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

• . Hybrid metal–dielectric nanostructures allow for combining the thermo-optical properties of both plasmonic and all-dielectric nanoantennas, simultaneously. Here, by taking advantage of different thermo-optical properties of metallic and dielectric metasurfaces, we propose a novel hybrid metasurface that

• thermal dependence of silicon to further explore the thermal tunability of the designed hybrid metal–dielectric nanostructures. Figure 2b demonstrates the transmission characteristics of each element in the hybrid metasurface, including silicon disk lattice, one-gold-bar lattice, and two-gold-bar lattice