Programmable plasmonic phase modulation of free-space wavefronts at gigahertz rates

2019 ◽  
Vol 13 (6) ◽  
pp. 431-435 ◽  
Author(s):  
Alexei Smolyaninov ◽  
Abdelkrim El Amili ◽  
Felipe Vallini ◽  
Steve Pappert ◽  
Yeshaiahu Fainman
Keyword(s):  
Free Space ◽  
Phase Modulation

scholarly journals A review of terahertz phase modulation from free space to guided wave integrated devices

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hongxin Zeng ◽  
Sen Gong ◽  
Lan Wang ◽  
Tianchi Zhou ◽  
Yaxin Zhang ◽  
...  
Keyword(s):  
Free Space ◽  
Phase Modulation ◽  
Phase Change Materials ◽  
Guided Wave ◽  
Research Progress ◽  
Future Application ◽  
Phase Modulator ◽  
Phase Modulators ◽  
Tunable Materials ◽  
Core Technology

Abstract In the past ten years, terahertz technology has developed rapidly in wireless communications, spectroscopy, and imaging. Various functional devices have been developed, such as filters, absorbers, polarizers, mixers, and modulators. Among these, the terahertz phase modulation is a current research hotspot. It is the core technology to realize flexible control of the terahertz wavefront, beam scanning, focusing deflection. It is indispensable in terahertz wireless communication, high-resolution imaging, and radar systems. This review summarizes the research progress of terahertz phase modulators from the two major types: free space and guided wave integration. Among these, the free space terahertz phase modulator is realized by combining the tunable materials and artificial metasurfaces. Based on different types of tunable materials, the terahertz free space phase modulator combining the semiconductor, liquid crystal, phase change materials, graphene, and other two-dimensional materials are introduced, and the influence of different materials on the phase modulation performance is discussed and analyzed. The monolithic integration and waveguide embedding methods are introduced separately, and the characteristics of different forms of terahertz-guided wave phase modulation are also discussed. Finally, the development trends of terahertz phase modulators, possible new methods, and future application requirements are discussed.

scholarly journals Phase Modulation Schemes in Food Free Space Optical Coherent System

2016 ◽  
Vol 11 (5) ◽  
pp. 367-374
Author(s):  
Huiying Zhang ◽  
Hongzuo Li ◽  
Xiao Dongya ◽  
Cai Chao
Keyword(s):  
Free Space ◽  
Phase Modulation ◽  
Coherent System ◽  
Free Space Optical ◽  
Modulation Schemes

A high-speed retro-reflector for free-space communication based on electro-optic phase modulation

2003 ◽  
Vol 81 (4) ◽  
pp. 639-650 ◽  
Author(s):  
T Mikaelian ◽  
M Weel ◽  
A Kumarakrishnan ◽  
P R Battle ◽  
R C Swanson
Keyword(s):  
Laser Beam ◽  
Free Space ◽  
Phase Modulation ◽  
High Speed ◽  
Signal To Noise Ratio ◽  
Heterodyne Detection ◽  
Space Communication ◽  
Electro Optic ◽  
Beam Incident ◽  
Free Space Communication

We demonstrate that an electro-optic phase modulator (EOM) can be used as a constituent of a corner-cube-based modulated high-speed retro-reflector. We performed experiments to investigate the efficiency of the phase modulation produced by an EOM as a function of the angle of a laser beam incident on it. Our experiments demonstrate that the field of view of the EOM is determined by its dimensions and the diameter of the laser beam. This suggests that the device may be suitable for applications involving high-speed (GHz), free-space communication. In these applications, the retro-reflector can be mounted on a moving platform such as a satellite. We find that it is possible to detect the retro-reflected signal with an adequate signal-to-noise ratio using heterodyne detection. We also discuss some practical considerations necessary for the implementation of such a device. PACS Nos.: 42.60.–V, 42.62.Cf, 42.62.Fi, 42.79.Sz, 42.79.Hp

Characterization of the phase modulation property of a free-space electro-optic modulator by interframe intensity correlation matrix

2012 ◽  
Vol 51 (19) ◽  
pp. 4457 ◽  
Author(s):  
Huimin Yue ◽  
Lei Song ◽  
Zexiong Hu ◽  
Hongxiang Liu ◽  
Yong Liu ◽  
...  
Keyword(s):  
Free Space ◽  
Correlation Matrix ◽  
Phase Modulation ◽  
Intensity Correlation ◽  
Electro Optic ◽  
Electro Optic Modulator

High-Speed Reconfigurable Free-Space Optical Interconnects with Carrierless-Amplitude-Phase Modulation and Space-Time-Block Code

2019 ◽  
Vol 37 (2) ◽  
pp. 627-633 ◽  
Author(s):  
Ke Wang ◽  
Christina Lim ◽  
Elaine Wong ◽  
Kamal Alameh ◽  
Sithamparanathan Kandeepan ◽  
...  
Keyword(s):  
Free Space ◽  
Phase Modulation ◽  
Optical Interconnects ◽  
High Speed ◽  
Block Code ◽  
Space Time ◽  
Free Space Optical ◽  
Time Block ◽  
Space Time Block Code

The observation of solutions in Ni3Nb

1988 ◽  
Vol 46 ◽  
pp. 540-541
Author(s):  
Z.M. Wang ◽  
J.P. Zhang
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Phase Modulation ◽  
High Resolution Electron Microscopy ◽  
Antiphase Domain ◽  
Boundary Area ◽  
Matrix Type ◽  
Resolution Electron ◽  
Domain Boundaries ◽  
Kontorova Model

High resolution electron microscopy reveals that antiphase domain boundaries in β-Ni3Nb have a hexagonal unit cell with lattice parameters ah=aβ and ch=bβ, where aβ and bβ are of the orthogonal β matrix. (See Figure 1.) Some of these boundaries can creep “upstairs” leaving an incoherent area, as shown in region P. When the stepped boundaries meet each other, they do not lose their own character. Our consideration in this work is to estimate the influnce of the natural misfit δ{(ab-aβ)/aβ≠0}. Defining the displacement field at the boundary as a phase modulation Φ(x), following the Frenkel-Kontorova model [2], we consider the boundary area to be made up of a two unit chain, the upper portion of which can move and the lower portion of the β matrix type, assumed to be fixed. (See the schematic pattern in Figure 2(a)).

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