Results 81 to 90 of about 246,836 (290)

Quasi‐Single‐Mode Polaritonic Crystal for Hyperbolic Phonon‐Polaritons

Advanced Optical Materials, EarlyView.
Near‐field study of the polaritonic Fourier crystal with α‐MoO3 reveals that the hyperbolic phonon‐polaritons within the Type‐I Reststrahlen band may form a quasi‐single‐mode Bloch wave where only the fundamental mode propagates in the crystal. Our results demonstrate the realization of a quasi‐single‐mode regime for the inherently multimode hyperbolic
Sergey G. Menabde, Yongjun Lim, Alexey Y. Nikitin, Pablo Alonso‐González, Jacob T. Heiden, Heerin Noh, Seungwoo Lee, Min Seok Jang   +7 more
wiley   +1 more source

Coherent Multimode OAM Superpositions for Multidimensional Modulation

IEEE Photonics Journal, 2014
The generation, propagation, and detection of high-quality and coherently superimposed optical vortices, carrying two or more orbital angular momentum (OAM) states, is experimentally demonstrated using an optical arrangement based on spatial light ...
Jaime A. Anguita, Joaquin Herreros, Ivan B. Djordjevic   +2 more
doaj   +1 more source

Cross‐Phase Modulation via Time‐Varying Epsilon‐Near‐Zero Metasurfaces

Advanced Optical Materials, EarlyView.
Time‐varying epsilon‐near‐zero metasurfaces are shown to enable cross‐phase modulation beyond conventional ENZ excitation. By engineering dual absorption bands and exploiting oblique ultrafast pumping, large and broadband frequency translations are achieved at low pump energies.
Rakesh Dhama, Md Imran Hossain, Jesse Pietila, Thomas Fordell, Humeyra Caglayan   +4 more
wiley   +1 more source

Channel Correlation-Based Adaptive Power Transmission for Free-Space Optical Communications

Photonics
Free-space optical (FSO) communication has received widespread attention as a high-bandwidth, low-latency communication technique. However, the scintillation effect caused by atmospheric turbulence leads to intensity fluctuations of the transmission ...
Bai-Shan Zhao, Peng-Fei Lv, Yan-Qing Hong   +2 more
doaj   +1 more source

Controlling the Spatial Coherence of an Optical Source Using a Spatial Filter

Applied Sciences, 2018
This paper presents the theory for controlling the spectral degree of coherence via spatial filtering. Starting with a quasi-homogeneous partially coherent source, the cross-spectral density function of the field at the output of the spatial filter is ...
Milo W. Hyde
doaj   +1 more source

On Applications of Disruption Tolerant Networking to Optical Networking in Space [PDF]

, 2012
The integration of optical communication links into space networks via Disruption Tolerant Networking (DTN) is a largely unexplored area of research. Building on successful foundational work accomplished at JPL, we discuss a multi-hop multi-path network ...
Hylton, Alan Guy, Iannicca, Dennis, Juergens, Jeffrey, Raible, Daniel E.   +3 more
core   +1 more source

Spectral Selectivity Enhancement in Solar Absorber Multilayers through Titanium Oxynitride Thin Film Modulation

Advanced Optical Materials, EarlyView.
Optical and plasmonic properties of TiN and Ti(O)N thin films were tuned at the synthesis stage by modulating the oxygen pressure during room‐temperature pulsed laser deposition. Ti(O)N thin films exhibiting a highly metallic and peculiar double‐epsilon‐near‐zero (DENZ) behavior were produced.
Claudia P. Hallqvist, Cristina Mancarella, Marco Agozzino, Salvatore Lucchese, Luca Mascaretti, Ivan Richter, Alessio Lamperti, Demosthenes C. Koutsogeorgis, Nikolaos Kalfagiannis, Andrea Li Bassi   +9 more
wiley   +1 more source

Turbulence-resistant high speed free-space optical communications using MUTC photodiodes

Results in Optics
In free-space optical (FSO) communication systems, atmospheric turbulence induces scintillation of received optical power. Higher transmission optical power can compensate turbulence-induced scintillation and other channel attenuation.
Beibei Cui, Shanyong Cai, Liqian Wang, Zhiguo Zhang   +3 more
doaj   +1 more source

On the Performance of Coherent OFDM Systems in Free-Space Optical Communications

IEEE Photonics Journal, 2015
This paper presents a new model of a coherent orthogonal frequency division multiplexing free space optical communication (OFDM-FSO) system that can be tuned with the virtual local oscillator, under the Gamma-Gamma atmospheric turbulence channel, not ...
Yi Wang, Deli Wang, Jing Ma
doaj   +1 more source

Projector‐Induced Waveguide Encoded Lattices (ProWELs) with Optical Functionality: From Enhanced Fields of View (FOV) to 3D Data Encoding

Advanced Optical Materials, EarlyView.
We describe the fabrication of 3D polymeric waveguide architectures with tunability of waveguide diameter, lattice symmetry and long and short‐range order using an inexpensive (< $400 CAD) digital light projector. We demonstrate that Projector induced Waveguide Encoded Lattices (ProWELs) possess advanced functionality including tuneable Fields of View (
Kyle Stegman, Dusan Srdic, Fariha Mahmood, Kalaichelvi Saravanamuttu   +3 more
wiley   +1 more source