We present two configurations (one with and another without a half-wave plate) of a Sagnac interferometer (SI) containing chiral optical elements where either the Sagnac loop mirror's (SLM) reflectance is circular birefringence (CB) independent or polarization dependence/circular dichroism (CD) is canceled in both reflection and transmission. These schemes allow use of chiral components as feedback elements/filters in SLM of a laser and in switches/modulators and sensors requiring compensation of chiral media CD, as well as allowing calibration of CD measurements. We also compare/show the differences between SI containing devices with either CB or linear birefringence (LB).
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.21.024112 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Large-scale quantum photonic circuits require integrating multiple single-photon sources, which are typically based on spontaneous four-wave mixing (SFWM) in spiral waveguides or microring resonators (MRRs). Photons can be generated in both clockwise (CW) and counterclockwise (CCW) orientations from a single source in a Sagnac configuration, showing promise for improving scalability. In this work, we propose a fully integrable scheme for bidirectional creation and usage of single photons.
View Article and Find Full Text PDFUltra-High Sensitivity Methane Gas Sensor Based on Cryptophane-A Thin Film Depositing in Double D-Shaped Photonic Crystal Fiber Using the Vernier Effect.
Sensors (Basel)
December 2024
State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China.
Methane gas leakage can lead to pollution problems, such as rising ambient temperature. In this paper, the Vernier effect of a double D-shaped photonic crystal fiber (PCF) in a Sagnac interferometer (SI) is proposed for the accurate detection of mixed methane gas content in the gas. The optical fiber structure of the effective sensing in the sensing SI loop and the effective sensing in the reference SI loop are the same.
View Article and Find Full Text PDFMeasurement with indefinite causal order and the Sagnac interferometer.
Philos Trans A Math Phys Eng Sci
December 2024
School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK.
It has been shown that measurements involving indefinite causal order can be superior to those in which a sequence of operations occurs in a specified order. In optics, such measurements are realized naturally in a Sagnac interferometer. We show that such an arrangement can measure the solid angle (on the Poincaré sphere) enclosed by a sequence of unitary transformations of the polarization.
View Article and Find Full Text PDFLaser-deflection-based acoustic sensing is known for high bandwidth but low sensitivity. By embedding the sensing laser within a Sagnac interferometer and incorporating split-beam detection-originally developed for optical trapping microscopy-we demonstrate sensitive acoustic detection in air with a 2 MHz bandwidth. In a direct comparison, our method far-exceeds performance metrics of a state-of-the-art, commercially-available, high-bandwidth microphone.
View Article and Find Full Text PDFArticle Synopsis
- High-speed quantum key distribution (QKD) systems are using gain-switched semiconductor lasers (GSSL) and Sagnac interferometers due to their efficiency and cost-effectiveness.
- However, the finite extinction ratio of GSSL can lead to a time-dependent side-channel that can compromise security by leaking information between the output polarization states of light pulses.
- The study explores this vulnerability, tests various countermeasures, and presents a mathematical framework to evaluate their effects on secure key rates, ultimately offering practical recommendations for enhancing QKD security.
Want 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!