Results 61 to 70 of about 2,722 (251)

Tunable Quasi‐Resonances in Polypyrrole Nanodisks

Advanced Optical Materials, EarlyView.
Polaronic carrier absorption enables electrochemically switchable quasi‐resonances in conducting polymer nanoantennas. ABSTRACT Redox‐tunable conducting polymers have emerged as promising materials for dynamic plasmonics and metasurfaces. However, only a few conducting polymers with particularly high conductivities (>1000 S/cm) have been reported to ...
Weiwei Liu, Chaoyang Kuang, Vallery Stanishev, Vanya Darakchieva, Shangzhi Chen, Magnus P. Jonsson   +5 more
wiley   +1 more source

FAS for Secure and Covert Communications

IEEE Internet of Things Journal
This letter considers a fluid antenna system (FAS)-aided secure and covert communication system, where the transmitter adjusts multiple fluid antennas' positions to achieve secure and covert transmission under the threat of an eavesdropper and the detection of a warden.
Junteng Yao, Liangxiao Xin, Tuo Wu, Ming Jin 0001, Kai-Kit Wong, Chau Yuen, Hyundong Shin   +6 more
openaire   +2 more sources

Covert Communication in Mobile Applications (T)

2015 30th IEEE/ACM International Conference on Automated Software Engineering (ASE), 2015
This paper studies communication patterns in mobile applications. Our analysis shows that 63% of the external communication made by top-popular free Android applications from Google Play has no effect on the user-observable application functionality. To detect such covert communication in an efficient manner, we propose a highly precise and scalable ...
Rubin, Julia, Gordon, Michael I., Nguyen, Nguyen, Rinard, Martin C.   +3 more
openaire   +2 more sources

Strong Photoluminescence Enhancement in All‐Dielectric Ge Thin Film Metasurfaces for Integration on the Si Platform

Advanced Optical Materials, EarlyView.
Germanium (Ge) all‐dielectric metasurfaces can be leveraged to strongly enhance the radiative emission from Ge layers grown on silicon‐on‐insulator substrates by industry‐standard processes. At room‐temperature, the narrowband photoluminescence (PL) intensity is enhanced by a factor ∼40× with respect to unstructured films.
Jon Schlipf, Diana Ryzhak, Giovanni Capellini, Paul Oleynik, Oliver Skibitzki, Yuji Yamamoto, Inga A. Fischer   +6 more
wiley   +1 more source

On‐Chip Photonic Neural Network Architectures

Advanced Optical Materials, EarlyView.
This review presents a comprehensive overview of on‐chip photonic neural network architectures, covering key photonic building blocks, representative network types, and emerging applications. Recent advances, implementation challenges, and future directions are examined, highlighting the potential of integrated photonics to enable ultrafast, energy ...
Seokjin Hong, Berkay Neseli, Seungyeon Cho, Seungsoo Lee, Yeonjun Kim, Seungyoon Choi, Hyo‐Hoon Park, Hamza Kurt   +7 more
wiley   +1 more source

Achievability of Covert Quantum Communication

2025 IEEE International Symposium on Information Theory (ISIT)
We explore covert communication of qubits over an arbitrary quantum channel. Covert communication conceals the transmissions in the channel noise, ensuring that an adversary is unable to detect their presence. We show the achievability of a $\textit{square root law}$ (SRL) for quantum covert communication similar to that for classical: $M(n)\propto ...
Evan J. D. Anderson, Michael S. Bullock, Filip Rozpedek, Boulat A. Bash   +3 more
openaire   +2 more sources

Hydrophobic 1D and 3D Anodic Alumina Radiative Coolers on Aluminum: Humidity‐Resilient Daytime Sub‐Ambient Cooling

Advanced Optical Materials, EarlyView.
1D and 3D nanoporous anodic aluminum oxide (AAO) surfaces were functionalized with stearic acid (STA) to increase hydrophobicity and reduce the influence of humidity on radiative cooling performance. The STA coating improves cooling behavior under humid atmospheric conditions (Madrid summer), before while keeping the optical properties required for ...
Luis Moreno‐Sanabria, Carlos G. Cobos, Nadia Pastor, Marisol Martín‐González, Cristina V. Manzano   +4 more
wiley   +1 more source

Feature Selection–Based Detection of Covert Cyber Deception Assaults in Smart Grid Communications Networks Using Machine Learning

IEEE Access, 2018
The integration of computing and modern wireless communications techniques is enabling prolific intelligent monitoring and efficient control of electric power systems in the frameworks of smart grids.
Saeed Ahmed, Youngdoo Lee, Seung-Ho Hyun, Insoo Koo   +3 more
doaj   +1 more source

Highly Crystalline CsPbBr3 Thin Films With Amplified Spontaneous Emission via High‐Pressure Recrystallization

Advanced Optical Materials, EarlyView.
High‐pressure recrystallization provides a reproducible route to high‐quality CsPbBr3${\rm CsPbBr}_{3}$ thin films. Optimized processing at 300 bar yields smooth, pinhole‐free, single‐phase 3D perovskite layers with tunable thickness, enhanced crystallinity, reduced amplified‐spontaneous‐emission threshold, improved photostability, and phase‐transition
Asma Miled, Trong Tam Nguyen, Thi Anh Vui Nguyen, José Penuelas, Aziz Benamrouche, Céline Chevalier, Thi Kim Anh Hoang, Gaëlle Trippé‐Allard, Elsa Cassette, Brice Devif, Emmanuel Drouard, Emmanuelle Deleporte, Hanh Hong Mai, Abdelaziz Bouazizi, Christian Seassal, Hai Son Nguyen   +15 more
wiley   +1 more source

Multi-UAV Collaborative Covert Communications: An ISAC-based Approach

Leida xuebao
Covert Unmanned Aerial Vehicle (UAV) communication has garnered considerable attention for realizing a sustainable Low-Altitude Economy (LAE). Based on the Integrated Sensing And Communication (ISAC) framework, this paper studies the system strategies ...
Weijie YUAN, Jun WU, Yuye SHI
doaj   +1 more source