Silicon-on-insulator microring resonators have proven to be an excellent platform for label-free nanophotonic biosensors. The high index contrast of silicon-on-insulator allows for fabrication of micrometer-size sensors. However, it also limits the quality of the resonances by introducing an intrinsic mode-splitting. Backscattering of optical power at small waveguide variations lifts the degeneracy of the normal resonator modes. This severely deteriorates the quality of the output signal, which is of utmost importance to determine the performance of the microrings as a biosensor. We suggest an integrated interferometric approach to give access to the unsplit, high-quality normal modes of the microring resonator and experimentally show an improvement of the quality factor by a factor of 3.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.21.016955 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
High-dimensional photon states (qudits) are pivotal to enhance the information capacity, noise robustness, and data rates of quantum communications. Time-bin entangled qudits are promising candidates for implementing high-dimensional quantum communications over optical fiber networks with processing rates approaching those of classical telecommunications. However, their use is hindered by phase instability, timing inaccuracy, and low scalability of interferometric schemes needed for time-bin processing.
View Article and Find Full Text PDFPicometre-level surface control of a closed-loop, adaptive X-ray mirror with integrated real-time interferometric feedback.
J Synchrotron Radiat
January 2025
CAEN, Viareggio, Italy.
We provide a technical description and experimental results of the practical development and offline testing of an innovative, closed-loop, adaptive mirror system capable of making rapid, precise and ultra-stable changes in the size and shape of reflected X-ray beams generated at synchrotron light and free-electron laser facilities. The optical surface of a piezoelectric bimorph deformable mirror is continuously monitored at 20 kHz by an array of interferometric sensors. This matrix of height data is autonomously converted into voltage commands that are sent at 1 Hz to the piezo actuators to modify the shape of the mirror optical surface.
View Article and Find Full Text PDFHigh-precision monitoring and prediction of mining area surface subsidence using SBAS-InSAR and CNN-BiGRU-attention model.
Sci Rep
November 2024
School of Geomatics, Anhui University of Science and Technology, Huainan, 232001, China.
Article Synopsis
- Coal mining can cause surface subsidence which poses safety risks and hampers sustainable development, necessitating effective monitoring and prediction methods.
- The study introduces a new method that combines SBAS-InSAR technology with a CNN-BiGRU-Attention model to monitor and predict subsidence in the Banji mining area of Anhui Province, achieving accurate results based on satellite data from July 2021 to September 2023.
- The proposed method shows improved accuracy and reduced costs in monitoring subsidence, with prediction errors as low as 1 mm, thus presenting a significant advancement over traditional subsidence monitoring techniques.
Digital holographic microscopy retrieves amplitude and phase information of an image which allows us to computationally correct for imperfections in the imaging optics. However, digital holographic microscopy is an interferometric technique that is inherently sensitive to undesired phase variations between object and reference beam. These phase variations lower the fringe contrast if they are integrated over a finite exposure time which leads to a reduced amplitude of the retrieved image.
View Article and Find Full Text PDFWe propose a prototype called a flexible integrated resolution and efficient light-imaging-expanded synthetic system (FIREFLIES). This paper describes the design, manufacturing, and experimental demonstration of the proposed system. FIREFLIES enables interferometric imaging at approximately 1550 nm using a variable baseline sampling technique, in which the baseline-collected light field forms interference fringes that are captured by an on-chip photodetector.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!