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

• target rapidly within the field of view after switching to the super-oscillatory lens. Although dynamically tunable super-oscillatory lenses could be realized by utilizing phase-change materials [23], the problem of inflexibility still exists. Here, we propose a super-oscillatory step-zoom lens (SSL

• years, the super-oscillation method based on the fine interference of optical fields has been successfully applied to sub-diffraction focusing and super-resolution imaging. However, most previously reported works only describe static super-oscillatory lenses. Super-oscillatory lenses using phase-change

• materials still have issues regarding dynamic tunability and inflexibility. Therefore, it is vital to develop a flexible and tunable modulation approach for super-oscillatory lenses. In this paper, we propose a super-oscillatory step-zoom lens based on the geometric phase principle, which can switch between

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

• change the structural parameters and the other is to add tunable materials, such as phase change materials, graphene, or liquid crystals. Among them, graphene has attracted much attention in optics and optoelectronics [30][31][32][33][34]. As a single layer of carbon atoms arranged in a honeycomb

Comparative molecular dynamics simulations of thermal conductivities of aqueous and hydrocarbon nanofluids

• Adil Loya,
• Antash Najib,
• Fahad Aziz,
• Asif Khan,
• Guogang Ren and
• Kun Luo

Beilstein J. Nanotechnol. 2022, 13, 620–628, doi:10.3762/bjnano.13.54

• used as a means of enhancing the thermal conductive properties of base fluids. This method formulates a heterogeneous fluid conferred by nanoparticles and can be used for high-end fluid heat-transfer applications, such as phase-change materials and fluids for internal combustion engines. These

• nuclear reactors [7] and for thermal management of electronics [8][9]. As mentioned above, nanofluids have also proved to be very effective as working fluids [10][11] in solar thermal systems and for enhancing the thermal characteristics of phase-change materials (PCM) that are used for latent thermal

• As phase-change materials, alkane-based nanofluids are being used and it is found that as PCM nanofluids of CuO provide enhanced performance. Therefore, CuO nanoparticles in a nonpolar medium can serve as thermal storage materials [36]. Moreover, heat carrier metal/organic nanofluids of methanol and

Graphene–graphite hybrid epoxy composites with controllable workability for thermal management

• Idan Levy,
• Eyal Merary Wormser,
• Maxim Varenik,
• Matat Buzaglo,
• Roey Nadiv and
• Oren Regev

Beilstein J. Nanotechnol. 2019, 10, 95–104, doi:10.3762/bjnano.10.9

• (TIM) [3] is applied at the interface between the two surfaces to reduce the contact resistance. Commonly used types of TIM [4][5][6] include thermal greases and pastes, solder, phase-change materials [7] and, very often, filled-polymer adhesives, which are usually epoxy-based [5][8][9][10][11][12

Thermal energy storage – overview and specific insight into nitrate salts for sensible and latent heat storage

• Nicole Pfleger,
• Thomas Bauer,
• Claudia Martin,
• Markus Eck and
• Antje Wörner

Beilstein J. Nanotechnol. 2015, 6, 1487–1497, doi:10.3762/bjnano.6.154

• for latent heat storage are called PCMs (phase change materials) because the heat storage is achieved by a phase change. Another technique to store heat is thermochemical heat storage (TCS). TCS makes use of the enthalpy of reaction ΔH. In reactions featuring a positive change of ΔH (endothermic

• considerably. Therefore the energy stored within a limited temperature range of 10 K is increased by approximately more than one order of a magnitude in phase change materials compared to sensible storage materials. For example a phase transition taking place within 10 K with a melting enthalpy of 150 kJ·kg−1

• . Combination of PCMs with sensible heat storage for effective heat capacity enhancement Common storage systems are sensible materials or phase change materials. Some research has been performed on the combination of several phase change materials which can result in a sensible storage type system with enhanced

Controlling the near-field excitation of nano-antennas with phase-change materials

• Tsung Sheng Kao,
• Yi Guo Chen and
• Ming Hui Hong

Beilstein J. Nanotechnol. 2013, 4, 632–637, doi:10.3762/bjnano.4.70

• the landscape of the plasmonic system at a step resolution of λ/20. These findings introduce a new approach for nano-circuitry, bio-assay addressing and imaging applications. Keywords: light localization; nano-antenna; near field; phase-change materials; plasmon coupling; Introduction With the rapid

• crystalline state, leading to enhanced absorption and thus decreasing the transmitted light intensity. By exploiting different plasmonic resonators or changing the thickness and composites of the underlying phase-change materials, the energy loss may be reduced, increasing the feasibility to implement this

• be selectively excited on constituent dipole nano-antennas by controlling different intermediate phases of an underneath phase-change thin film (Ge2Sb2Te5, GST). The hybrid plasmonic system of gold nano-antennas and phase-change materials can be fabricated on a transparent quartz substrate. The