6 research outputs found
On-chip spectroscopy with thermally-tuned high-Q photonic crystal cavities
Spectroscopic methods are a sensitive way to determine the chemical
composition of potentially hazardous materials. Here, we demonstrate that
thermally-tuned high-Q photonic crystal cavities can be used as a compact
high-resolution on-chip spectrometer. We have used such a chip-scale
spectrometer to measure the absorption spectra of both acetylene and hydrogen
cyanide in the 1550 nm spectral band, and show that we can discriminate between
the two chemical species even though the two materials have spectral features
in the same spectral region. Our results pave the way for the development of
chip-size chemical sensors that can detect toxic substances
OpenGDA: Graph Domain Adaptation Benchmark for Cross-network Learning
Graph domain adaptation models are widely adopted in cross-network learning
tasks, with the aim of transferring labeling or structural knowledge.
Currently, there mainly exist two limitations in evaluating graph domain
adaptation models. On one side, they are primarily tested for the specific
cross-network node classification task, leaving tasks at edge-level and
graph-level largely under-explored. Moreover, they are primarily tested in
limited scenarios, such as social networks or citation networks, lacking
validation of model's capability in richer scenarios. As comprehensively
assessing models could enhance model practicality in real-world applications,
we propose a benchmark, known as OpenGDA. It provides abundant pre-processed
and unified datasets for different types of tasks (node, edge, graph). They
originate from diverse scenarios, covering web information systems, urban
systems and natural systems. Furthermore, it integrates state-of-the-art models
with standardized and end-to-end pipelines. Overall, OpenGDA provides a
user-friendly, scalable and reproducible benchmark for evaluating graph domain
adaptation models. The benchmark experiments highlight the challenges of
applying GDA models to real-world applications with consistent good
performance, and potentially provide insights to future research. As an
emerging project, OpenGDA will be regularly updated with new datasets and
models. It could be accessed from https://github.com/Skyorca/OpenGDA.Comment: Under Revie
Realization of a Flat-Band Superprism On-Chip from Parallelogram Lattice Photonic Crystals
By optimizing the dispersion curve of a parallelogram-based 2D photonic crystal superprism for constant angular group velocity dispersion over a broad bandwidth, we designed a device capable of experimentally demonstrating linear dispersion from 1500 to 1600 nm with clear separation of as many as eight channels, while maintaining a compact footprint
Realization of fla-band superprism structures on-chip from parallelogram lattice photonic crystals (data)
Research measurement data for the publication: Realization of flat-band superprism structures on-chip from parallelogram lattice photonic crystals