No abstract

We report an experimental realization of lensless ghost imaging for a phase-only object with pseudo-thermal light, which was proposed by W. Gong and S. Han [Phys. Rev. A 82, 023828 (2010)]. In contrast with conventional ghost imaging, the scheme involves the interference of two correlated fields and the phase information of the object can be retrieved. This imaging technique completes the nonlocally lensless spatial reconstruction of both amplitude and phase distributions in ghost imaging with thermal light.

as an essential part of the IoT network has attracted much attention in many areas such as wearable applications. Fully optical transparency becomes one of the necessities for these devices, e.g., a recent study reported an under-screen transparent antenna array, which was utilized in the assembly of next-generation cellphones. [1] The real-time noninterruptive transparent and flexible wireless communicational devices are needed in a wide range of scenarios. For example, transparency is in exact need in applications such as smart contact lenses for not blocking the user's vision while enabling the noninvasive method for continuous medical diagnosis. [2,3] Furthermore, on top of transparency, flexibility is also a very important ingredient, especially for wearable devices. Excellent flexibility of such wireless electronics is also necessary in order to closely match the curvature of the eyeballs, reducing the discomfort of patients. [4] To fabricate transparent and flexible wireless devices, the main challenge remains the realization of transparent and flexible antenna. Therefore, the demand of transparent and flexible antenna has been rapidly growing in recent years.The demand of emerging transparent and flexible wireless electronic devices is ever-increasing for Internet of Things (IoT) scenarios, like noninvasive healthcare, real-time wearable electronics, etc. However, as an essential part of the IoT wireless communicational devices, radio frequency (RF) antennas are still hampered by poor-flexibility, low-conductivity, and weaktransparency. Here, based on the unique electronic and optical properties of graphene, a method to obtain these appealing features concurrently through promoting synergistic effect between two-dimensional (2D) and one-dimensional (1D) materials is studied. It is found that this method could not only successfully maintain transparency and flexibility, but also greatly enhance the overall performance of the antenna. The fabricated antenna exhibits a 75% light transmittance, from 5.6 to 12.8 GHz ultrawide bandwidth and outstanding durability and stability. Moreover, a transparent and flexible radio frequency identification (RFID) tag is also designed and demonstrated with a remarkable reading distance. These findings show that the method by promoting synergistic effect of hybrid materials has great potential in the design of next generation novel and high-performance wireless electronics.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.

The application of epitaxial yttrium iron garnet (YIG) thin film on high frequency on-chip spiral inductors is investigated. The YIG thin film with the thickness of 3.6 μm was grown on GGG(111) substrate using the liquid phase method, which exhibits relatively high saturation magnetization 4πMs of 1615 Oe close to the bulk value of 1750 Oe and low initial coercivity Hc of 0.5 Oe that minimizes the hysteretic losses. Subsequently, the spiral inductors were directly fabricated on the YIG/GGG(111) substrate. The results show substantial improvement in the optimum operating frequency and self-resonance frequency of the on-chip spiral inductor with the YIG thin film with an increase of 50% up to ∼7.5 GHz and 14.2 GHz, respectively, implying that on-chip spiral inductors with the YIG thin film can be applied to much higher frequency RF circuits.

Dual-band meander line antennas for radio location and 5G are successfully demonstrated with carbon nanotubes, graphene flakes and Ag nanowires.

In this work, on-chip spiral inductors with back hollow structure have been prepared on the 500 [Formula: see text] thick silicon substrate with high resistivity [Formula: see text]. The silicon underneath the inductor region has been completely etched by deep etching process in order to reduce the substrate eddy current losses. Several types of square spiral on-chip inductors with different metal width (w) and line spacing (s) in the case of [Formula: see text] were fabricated. The experimental results are verified by FEM simulation using HFSS software. The results show that the Q-factor and self-resonance frequency of back hollow structure inductors are both enhanced compared with the conventional inductors. Furthermore, narrower width of coils for the on-chip spiral inductors with back hollow structure can result in higher Q-factor, inductance L and self-resonance frequency, which provide some important design guides for the fabrication of the high performance on-chip inductors.

No abstract

We report a novel one-step laser-patterning technology for CNT ultra-wideband antennas.