A5074855336- Photonic and Optical Devices
- Metamaterials and Metasurfaces Applications
- Advanced Neural Network Applications
- Multimodal Machine Learning Applications
- Advanced Image and Video Retrieval Techniques
- Orbital Angular Momentum in Optics
- Terahertz technology and applications
- Human Pose and Action Recognition
- Plasmonic and Surface Plasmon Research
- Domain Adaptation and Few-Shot Learning
- Photonic Crystals and Applications
- Cancer-related molecular mechanisms research
- Advanced Fiber Laser Technologies
- Advanced Antenna and Metasurface Technologies
- Advanced Measurement and Detection Methods
- Adaptive optics and wavefront sensing
- Video Surveillance and Tracking Methods
- Digital Holography and Microscopy
- Advanced Optical Imaging Technologies
- Nonlinear Photonic Systems
- Hand Gesture Recognition Systems
- Topic Modeling
- Spectroscopy and Chemometric Analyses
- Image and Object Detection Techniques
- Photorefractive and Nonlinear Optics
Tsinghua University
2019-2024
Beijing University of Posts and Telecommunications
2017-2024
Beijing Academy of Artificial Intelligence
2023
Abstract Broadband light sources emitting in the terahertz spectral range are highly desired for applications such as noninvasive imaging and spectroscopy. Conventionally, THz pulses generated by optical rectification bulk nonlinear crystals with millimetre thickness, bandwidth limited phase-matching condition. Here we demonstrate broadband emission via surface from a simple, commercially available 19 nm-thick indium tin oxide (ITO) thin film. We show an enhancement of signal when pump laser...
Optical metasurfaces are endowed with unparallel flexibility to manipulate the light field a subwavelength spatial resolution. Coupling materials strong optical nonlinearity may allow ultrafast spatiotemporal modulation. However, most demonstrated thus far linear devices. Here, we experimentally demonstrate simultaneous laser mode control using single-layer plasmonic metasurface strongly coupled an epsilon-near-zero (ENZ) material within fiber cavity. While geometric phase of is utilized...
Seeking new compact and controllable terahertz sources has garnered enormous interest across various disciplines. In our recent preliminary work, we have showcased the potential of an ultrathin indium tin oxide (ITO) film as innovative platform for generating broadband waves. this study, conducted both experimental theoretical investigations into a two-color femtosecond-laser-driven generation in ITO thin film. By adjusting time delay polarizations two driving pulses, observed that waves...
Self-supervised learning (SSL) has demonstrated its power in generalized model acquisition by leveraging the discriminative semantic and explicit positional information of unlabeled datasets. Unfortunately, mainstream contrastive learning-based methods excessive focus on ignore position is also carrier image content, resulting inadequate data utilization extensive computational consumption. To address these issues, we present an efficient SSL framework, What Where to learn (W <sup...
Entangled photon pair sources are essential for diverse quantum technologies, such as communication, computation, and imaging. Currently, most methods generating manipulating entangled pairs rely on bulk nonlinear crystals, with some requiring sophisticated engineering. In this work, we propose experimentally demonstrate a 68-nm-thick source using plasmonic metasurface strongly coupled to an epsilon-near-zero (ENZ) material. By tailoring dual resonances at both pump emission wavelengths...
Epsilon-near-zero (ENZ) materials have recently been suggested as excellent candidates for constructing all-optical and electro-optical switches in the infrared. The performance of previously reported ENZ material-based optical switches, however, has greatly hampered by low quality- (Q-) factor cavity, resulting a large required pump fluence or applied voltage, insertion loss, small modulation depth. Here, we propose solution integrating material into Bragg microcavity, such that Q-factor...
Abstract Conventional wavefront sensors suffer from the fundamental limitation of space‐bandwidth product and have a trade‐off between their spatial sampling interval dynamic range. Here, nonlocal thin film optical filters with optimized angle‐ polarization‐dependent responses are leveraged to circumvent limitation, robust single‐shot sensing system small 6.9 µm large angular range 15° is realized. The only requires inserting two multilayer dielectric filters, fabricated using mature...
Modern communications and microwave photonics require compact electro‐optic modulators with ultrahigh bandwidth low power consumption. These requirements can be satisfied by integrated lithium–niobate high However, most cannot achieve a good balance between an ultracompact size modulation bandwidth. challenges are overcome designing periodic dielectric waveguide modulator, featuring length of 87.4 μm, theoretical over 600 GHz, voltage‐length product 0.0874 V cm, sideband suppression ratio up...
Dielectric metasurfaces supporting Mie resonances can allow significantly boosted and tailored nonlinear light–matter interactions at the nanoscale. However, dielectric typically only have odd‐order nonlinearities, unless resorting to material systems such as GaAs, GaP, or LiNbO 3 , each with unique challenges in device fabrication integration. As most widely adopted constituent of metasurfaces, silicon (Si) does not possess an intrinsic second‐order susceptibility. Herein, second‐harmonic...
Periodic Dielectric Wave-Guide Modulators In article number 2200050, Yang Li and co-workers demonstrate a design of lithium–niobate periodic dielectric waveguide modulator with length as short 87.4 μm, modulation bandwidth over 600 GHz, voltage-length product 0.0874 V cm, sideband suppression ratio up to 36.1 dB. This provides compact solution next-generation communications microwave photonics.
In complex long-term news videos, the fundamental component is excerpt which consists of many studio and interview screens. Spotting identifying correct from such a video challenging task. Apart inherent temporal semantics generic events interactions, varied richness within text visual modalities further complicates matters. this paper, we delve into nuanced realm understanding, examining it through multimodal multitask perspective. Our research involves presenting more fine-grained...
Wavelength calibration is carried on before the spectrometer being used normally. The usual process to measure a standard light source of known wavelength, such as mercury-argon lamp. spectral lines formed by divided find peak value. It's critical match found values with wavelengths source. common method in use at present all need artificial participation. To make procedure automatic, this paper proposed matching combined Hough transform and RANSAC, which transforms problem finding correct...
We experimentally demonstrate simultaneous spatiotemporal laser mode control in a fiber cavity using single-layer plasmonic metasurfaces strongly coupled to an epsilon-near-zero material.
We experimentally demonstrate broadband THz emission, both in transmission and reflection configurations, from a commercially available indium tin oxide thin film, leveraging its unique epsilon-near-zero effect.
Since first proposed, Video Instance Segmentation(VIS) task has attracted vast researchers' focus on architecture modeling to boost performance. Though great advances achieved in online and offline paradigms, there are still insufficient means identify model errors distinguish discrepancies between methods, as well approaches that correctly reflect models' performance recognizing object instances of various temporal lengths remain barely available. More importantly, the fundamental abilities...
Dense pose estimation is a dense 3D prediction task for instance-level human analysis, aiming to map pixels from an RGB image surface of the body. Due large amount point regression, training process appears be easy collapse compared other region-based instance analyzing tasks. By loss formulation existing model, we introduce novel regression function, named Points} stable progress, and new balanced weighting strategy handle multi-task losses. With above novelties, propose brand architecture,...