The controlled vapor-phase synthesis of two-dimensional (2D) transition metal dichalcogenides (TMDs) is essential for functional applications. While chemical vapor deposition (CVD) techniques have been successful for ...
详细信息
We report the next generation optical nanotweezer approaches employing plasmatic cavities and optical anapole states for the high throughput trapping and dynamic manipulation of nanoscale objects and biomolecules with...
1D topological photonic cavities supporting a single resonance around the wavelength of 800 nm were fabricated from a gallium nitride on silicon wafer for highly polarized second harmonic generation around the wavelen...
详细信息
作者：
Qing CaoDepartment of Materials Science and Engineering
Department of Electrical and Computer EngineeringDepartment of Chemistry Seitz Materials Research LaboratoryUniversity of Illinois at Urbana-ChampaignUrbanaIL 61820USA
Scaling of silicon field-effect transistors has fueled the exponential development of microelectronics in the past 60 years,but is now close to its physical limits with the critical dimensions of state-of-the-art sili...
详细信息
Scaling of silicon field-effect transistors has fueled the exponential development of microelectronics in the past 60 years,but is now close to its physical limits with the critical dimensions of state-of-the-art silicon devices approaching the sub-10 nm *** nanotubes have been suggested to hold great promise of replacing the central role of silicon in the next-generation logic switches with their unique geometrical and electrical *** this article,I firstly examine the scaling advantages of carbon nanotubes compared to silicon from technology-development perspective,and then review the latest progress on addressing the manufacturability issues for scaled carbon-nanotube transistors,from materials to device-integration ***,the possible pathways for nanotube transistors to transition into commercial applications are discussed.
The Lorentz reciprocity is a fundamental property in electromagnetism and well known to break down due to an external magnetic field. With a fictitious or imaginary vector potential, however, its behavior is largely u...
详细信息
The Lorentz reciprocity is a fundamental property in electromagnetism and well known to break down due to an external magnetic field. With a fictitious or imaginary vector potential, however, its behavior is largely unknown. Here we show that in systems with an imaginary vector potential and displaying the non-Hermitian skin effect, the Lorentz reciprocity is broken but still governed by a rigorous mathematical relation, which we term non-Hermitian gauged reciprocity. When mimicking an imaginary vector potential using just linear integrated photonic elements, however, the conditions that lead to the Lorentz reciprocity are still satisfied and hence the latter cannot be broken. Nevertheless, we show that the non-Hermitian gauged reciprocity can still be observed with a proper choice of inputs and outputs, alongside the Lorentz reciprocity. In addition, we also reveal another equal-amplitude response in the same system, which we attribute to a non-Hermitian gauged symmetry. Furthermore, we show that light propagation is not impinged by the non-Hermitian topological funnel effect, highlighting an underappreciated difference between coherently driven and nondriven systems. These findings are confirmed using a tight-binding model and full-wave simulations of coupled optical microring resonators, providing a valuable extension of the Lorentz reciprocity in the non-Hermitian domain.
Sleep is the natural state of relaxation for human being. Sleep quality is an essential yet frequently neglected aspect of sleep in general. Sleep quality is essential because it allows the body to restore itself and ...
详细信息
Developing on-chip functional devices requires reliable fabrication methods with high resolution for miniaturization,desired components for enhanced performance,and high throughput for fast prototyping and mass ***,la...
详细信息
Developing on-chip functional devices requires reliable fabrication methods with high resolution for miniaturization,desired components for enhanced performance,and high throughput for fast prototyping and mass ***,laser-based bubble-pen lithography(BPL)has been developed to enable sub-micron linewidths,in situ synthesis of custom materials,and on-demand patterning for various functional components and *** exploits Marangoni convection induced by a laser-controlled microbubble to attract,accumulate,and immobilize particles,ions,and molecules onto different *** years have witnessed tremendous progress in theory,engineering,and application of BPL,which motivated us to write this ***,an overview of experimental demonstrations and theoretical understandings of BPL is ***,we discuss the advantages of BPL and its diverse applications in quantum dot displays,biological and chemical sensing,clinical diagnosis,nanoalloy synthesis,and *** conclude this review with our perspective on the challenges and future directions of BPL.
We report a simple, vacuum-compatible fiber attach process for in situ study of grating-coupled photonic devices. The robustness of this technique is demonstrated on grating-coupled waveguides exposed to multiple X-ra...
详细信息
We report a simple, vacuum-compatible fiber attach process for in situ study of grating-coupled photonic devices. The robustness of this technique is demonstrated on grating-coupled waveguides exposed to multiple X-ra...
详细信息
暂无评论