Changyu Hu
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View article: Planar waveguide to vertical mode couplers covering the visible to IR spectral range
Planar waveguide to vertical mode couplers covering the visible to IR spectral range Open
Planar 45 o turning mirrors with metal coating embedded in SU8 polymer waveguides enable waveguide to vertical mode coupling across a broad range of wavelengths from the visible to IR. The fabrication of these 2.5D structures is achieved u…
View article: Noise-Reduced Dynamic Face Expression Identification with Frame-Level Attention and Global-Segment-Level Recognition
Noise-Reduced Dynamic Face Expression Identification with Frame-Level Attention and Global-Segment-Level Recognition Open
View article: Inverse Synthetic Aperture Radar Sparse Imaging Exploiting the Group Dictionary Learning
Inverse Synthetic Aperture Radar Sparse Imaging Exploiting the Group Dictionary Learning Open
Sparse imaging relies on sparse representations of the target scenes to be imaged. Predefined dictionaries have long been used to transform radar target scenes into sparse domains, but the performance is limited by the artificially designe…
View article: Model of thermo-optic nonlinear dynamics of photonic crystal cavities
Model of thermo-optic nonlinear dynamics of photonic crystal cavities Open
The wavelength scale confinement of light offered by photonic crystal (PhC) cavities is one of the fundamental features on which many important on-chip photonic components are based, opening silicon photonics to a wide range of application…
View article: Photonic crystal cavity based optical induced transparency
Photonic crystal cavity based optical induced transparency Open
Nowadays, information technology has been deeply integrated in our daily life. However, within its rapid development, it faces a serious bottleneck due to the prohibitive power consumption and limited transmission bandwidth of electrical i…
View article: Inverse synthetic aperture radar imaging using complex‐value deep neural network
Inverse synthetic aperture radar imaging using complex‐value deep neural network Open
As compared with traditional ISAR imaging methods, the compressive sensing (CS)‐based imaging methods can obtain high‐quality images using much less under‐sampled data. However, the availability or appropriateness of the sparse representat…
View article: Wavelength stability in a hybrid photonic crystal laser through controlled nonlinear absorptive heating in the reflector
Wavelength stability in a hybrid photonic crystal laser through controlled nonlinear absorptive heating in the reflector Open
View article: Tunable Optical Buffer through an Analogue to Electromagnetically Induced Transparency in Coupled Photonic Crystal Cavities
Tunable Optical Buffer through an Analogue to Electromagnetically Induced Transparency in Coupled Photonic Crystal Cavities Open
Tunable on-chip optical delay has long been a key target for the research community, as it is the enabling technology behind delay lines, signal retiming and other applications vital to optical signal processing. To date, the field has bee…
View article: Thin high numerical aperture metalens
Thin high numerical aperture metalens Open
We designed, fabricated, and characterized a thin metalens in an amorphous silicon film of diameter 30 µm, focal length equal to the incident wavelength 633 nm. The lens is capable of simultaneously manipulating the state of polarization a…