scholarly journals Electrically Programmable Terahertz Diatomic Metamolecules for Chiral Optical Control

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Longqing Cong ◽  
Prakash Pitchappa ◽  
Nan Wang ◽  
Ranjan Singh
Keyword(s):  
Optical Communications ◽  
Spatial Light Modulator ◽  
Three Dimensional ◽  
Optical Control ◽  
Light Modulator ◽  
Optical Chirality ◽  
New Strategy ◽  
On Chip ◽  
External Stimuli ◽  
Single Pixel

Optical chirality is central to many industrial photonic technologies including enantiomer identification, ellipsometry-based tomography, and spin multiplexing in optical communications. However, a substantial chiral response requires a three-dimensional constituent, thereby making the morphology highly complex to realize structural reconfiguration. Moreover, an active reconfiguration demands intense dosage of external stimuli that pose a major limitation for on-chip integration. Here, we report a low bias, electrically programmable synthetic chiral paradigm with a remarkable reconfiguration among levorotatory, dextrorotatory, achiral, and racemic conformations. The switchable optical activity induced by the chiral conformations enables a transmission-type duplex spatial light modulator for terahertz single pixel imaging. The prototype delivers a new strategy towards reconfigurable stereoselective photonic applications and opens up avenues for on-chip programmable chiral devices with tremendous applications in biology, medicine, chemistry, and photonics.

scholarly journals Electrically Programmable Terahertz Diatomic Metamolecules for Chiral Optical Control

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Longqing Cong ◽  
Prakash Pitchappa ◽  
Nan Wang ◽  
Ranjan Singh
Keyword(s):  
Optical Communications ◽  
Spatial Light Modulator ◽  
Three Dimensional ◽  
Optical Control ◽  
Light Modulator ◽  
Optical Chirality ◽  
New Strategy ◽  
On Chip ◽  
External Stimuli ◽  
Single Pixel

Optical chirality is central to many industrial photonic technologies including enantiomer identification, ellipsometry-based tomography, and spin multiplexing in optical communications. However, a substantial chiral response requires a three-dimensional constituent, thereby making the morphology highly complex to realize structural reconfiguration. Moreover, an active reconfiguration demands intense dosage of external stimuli that pose a major limitation for on-chip integration. Here, we report a low bias, electrically programmable synthetic chiral paradigm with a remarkable reconfiguration among levorotatory, dextrorotatory, achiral, and racemic conformations. The switchable optical activity induced by the chiral conformations enables a transmission-type duplex spatial light modulator for terahertz single pixel imaging. The prototype delivers a new strategy towards reconfigurable stereoselective photonic applications and opens up avenues for on-chip programmable chiral devices with tremendous applications in biology, medicine, chemistry, and photonics.

scholarly journals Fast fabrication of silver helical metamaterial with single-exposure femtosecond laser photoreduction

Nanophotonics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 1087-1093 ◽  
Author(s):  
Lipu Liu ◽  
Dong Yang ◽  
Weiping Wan ◽  
Hong Yang ◽  
Qihuang Gong ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Spatial Light Modulator ◽  
Double Helix ◽  
Three Dimensional ◽  
Single Exposure ◽  
Light Modulator ◽  
Flow Problems ◽  
Optical Chirality ◽  
Rapid Fabrication ◽  
Wide Wavelength Range

AbstractMetallic helical metamaterials have become the prominent candidates for circular polarizers and other optical-chiral devices as they exhibit strong circular dichroism at a broad operation bandwidth. However, the rapid fabrication of an intertwined double helix with multiple pitch numbers and excellent mechanical strength, electrical conductivity and surface smoothness remains a challenge. We propose and realize the single-exposure femtosecond laser photoreduction of a freestanding, three-dimensional silver double-helix microstructure by the double-helix focal field intensity engineered with a spatial light modulator. At the same time, the photoreduction solution and the laser repetition rate are optimized to further tackle the surface roughness and the thermal flow problems. As a result, the silver double-helix array with the enhanced quality exhibits pronounced optical chirality in a wide wavelength range from 3.5 to 8.5 μm. This technique paves a novel way to easily and rapidly fabricate metallic metamaterials for chiro-optical devices in the mid-infrared regime.

Real-Time Three-Dimensional Object Capturing and Mapping with Optical Correlators

2012 ◽  
Vol 586 ◽  
pp. 374-377
Author(s):  
Zheng Quan He ◽  
Yu Lin Li ◽  
Xiang Sheng Huang ◽  
De Pong Kong ◽  
Min Rui Zhang ◽  
...  
Keyword(s):  
Real Time ◽  
Spatial Light Modulator ◽  
Three Dimensional ◽  
Body Parts ◽  
Light Modulator ◽  
Correlation Algorithm ◽  
New Strategy ◽  
Optical Correlators ◽  
Dimensional Object ◽  
Body Recognition

In this paper a new strategy for real-time three-dimensional object capturing and mapping is proposed by using optical correlators. A spatial light modulator is applied in the new strategy. Owing to the properties of quickly parallel processing of optical correlation algorithm the technique can also implement real time object capturing and track, and, as for human body recognition the gesture of body parts can also be portrayed.

Holographic three-dimensional displays with liquid crystal on silicon spatial light modulator

2004 ◽  
Author(s):  
Aneta Michalkiewicz ◽  
Malgorzata Kujawinska ◽  
Tomasz Kozacki ◽  
Xinghua Wang ◽  
Philip J. Bos
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Three Dimensional ◽  
Light Modulator ◽  
Liquid Crystal On Silicon

scholarly journals Spatiotemporal light control with frequency-gradient metasurfaces

Science ◽  
2019 ◽  
Vol 365 (6451) ◽  
pp. 374-377 ◽  
Author(s):  
Amr M. Shaltout ◽  
Konstantinos G. Lagoudakis ◽  
Jorik van de Groep ◽  
Soo Jin Kim ◽  
Jelena Vučković ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Beam Steering ◽  
Three Dimensional ◽  
Optical Control ◽  
Steering Angle ◽  
Experimental Realization ◽  
Phase Gradient ◽  
Power Efficient ◽  
On Chip ◽  
Frequency Gradient

The capability of on-chip wavefront modulation has the potential to revolutionize many optical device technologies. However, the realization of power-efficient phase-gradient metasurfaces that offer full-phase modulation (0 to 2π) and high operation speeds remains elusive. We present an approach to continuously steer light that is based on creating a virtual frequency-gradient metasurface by combining a passive metasurface with an advanced frequency-comb source. Spatiotemporal redirection of light naturally occurs as optical phase-fronts reorient at a speed controlled by the frequency gradient across the virtual metasurface. An experimental realization of laser beam steering with a continuously changing steering angle is demonstrated with a single metasurface over an angle of 25° in just 8 picoseconds. This work can support integrated-on-chip solutions for spatiotemporal optical control, directly affecting emerging applications such as solid-state light detection and ranging (LIDAR), three-dimensional imaging, and augmented or virtual systems.

Monolithic device for on-chip fast optical phase conjugation integrating an image sensor and a spatial light modulator

2014 ◽  
Author(s):  
Timothé LaForest ◽  
Arnaud Verdant ◽  
Antoine Dupret ◽  
Sylvain Gigan ◽  
François Ramaz ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Phase Conjugation ◽  
Image Sensor ◽  
Optical Phase Conjugation ◽  
Light Modulator ◽  
Optical Phase ◽  
On Chip

scholarly journals Three-dimensional adaptive optics ultrahigh-resolution optical coherence tomography using a liquid crystal spatial light modulator

2005 ◽  
Vol 45 (28) ◽  
pp. 3432-3444 ◽  
Author(s):  
Enrique J. Fernández ◽  
Boris Považay ◽  
Boris Hermann ◽  
Angelika Unterhuber ◽  
Harald Sattmann ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Liquid Crystal ◽  
Adaptive Optics ◽  
Spatial Light Modulator ◽  
Three Dimensional ◽  
Optical Coherence ◽  
Light Modulator ◽  
Ultrahigh Resolution
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