Dielectric metasurface-assisted terahertz sensing: mechanism, fabrication, and multiscenario applications
Terahertz (THz) technology has attracted significant global interest, particularly in sensing applications, due to its nonionizing feature and sensitivity to weak interactions. Recently, owing to the advantages of low optical loss and the capability to …
General design flow for waveguide Bragg gratings
Bragg gratings are crucial components in passive photonic signal processing, with wide-ranging applications including biosensing, pulse compression, photonic computing, and addressing. However, the design of integrated waveguide Bragg gratings (WBGs) for …
High-efficiency radiation beyond the critical angle via phase-gradient antireflection metasurfaces
Total internal reflection generally occurs at incident angles beyond the critical angle, confining electromagnetic waves in dielectrics with higher refractive indices. In this work, we present a metasurface-based solution to transform such total reflection …
Collision of high-resolution wide FOV metalens cameras and vision tasks
Metalenses, with their compact form factor and unique optical capabilities, hold tremendous potential for advancing computer vision applications. In this work, we propose a high-resolution, large field-of-view (FOV) metalens intelligent recognition system, …
Waveguide-integrated spatial mode filters with PtSe_2 nanoribbons
Low-dimensional material-based heterogeneous silicon photonics has attracted significant attention due to their applications in developing integrated optoelectronic devices from the telecommunication band to mid-infrared wavelengths. However, the study of …
Nanoscale resolved mapping of the dipole emission of hBN color centers with a scattering-type scanning near-field optical microscope
Color centers in hexagonal boron nitride (hBN) are promising candidates as quantum light sources for future technologies. In this work, we utilize a scattering-type near-field optical microscope (s-SNOM) to study the photoluminescence (PL) emission …
Dynamically tunable robust ultrahigh-Q merging bound states in the continuum in phase-change materials metasurface
Bound states in the continuum (BICs) are localized states within the radiative continuum that exhibit high quality-factor (Q-factor) resonance, which significantly boosts light–matter interactions. However, out-of-plane radiation losses can arise from …
Ultrafast pulse propagation time-domain dynamics in dispersive one-dimensional photonic waveguides
Ultrafast pulses, particularly those with durations under 100?fs, are crucial in achieving unprecedented precision and control in light–matter interactions. However, conventional on-chip photonic platforms are not inherently designed for ultrafast …
A programmable platform for photonic topological insulators
In the past decade, the field of topological photonics has gained prominence exhibiting consequential effects in quantum information science, lasing, and large-scale integrated photonics. Many of these topological systems exhibit protected states, enabling …
Metalens formed by structured arrays of atomic emitters
Arrays of atomic emitters have proven to be a promising platform to manipulate and engineer optical properties, due to their efficient cooperative response to near-resonant light. Here, we theoretically investigate their use as an efficient metalens. We show …
Realizing electronically reconfigurable intrinsic chirality: from no absorption to maximal absorption of any desirable spin
Circular dichroism – the spin-selective absorption of light – finds diverse applications in medicine, antennas and microwave devices. In this work, we propose and experimentally demonstrate an ultrathin electronically reconfigurable chiral metasurface …
A general model for designing the chirality of exciton-polaritons
Chirality of exciton-polaritons can be tuned by the chirality of photons, excitons, and their coupling strength. In this work, we propose a general analytical model based on coupled harmonic oscillators to describe the chirality of exciton-polaritons. Our …
Simultaneous control of three degrees of freedom in perfect vector vortex beams based on metasurfaces
The perfect vector vortex beams (PVVBs) have played an important role in various fields due to their advantages of unique vortex features, flexible polarization distribution and multiple degrees of freedom (DoFs). The simultaneous and precise control over …