scholarly journals A self-healing ferroelectric liquid crystal electro-optic shutter based on vertical surface-relief grating alignment

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Peter J. M. Wyatt ◽  
James Bailey ◽  
Mamatha Nagaraj ◽  
J. Cliff Jones
Keyword(s):  
Adaptive Optics ◽  
Electric Fields ◽  
Surface Relief ◽  
High Speed ◽  
Spatial Light Modulators ◽  
Smectic Layer ◽  
Self Healing ◽  
Surface Relief Grating ◽  
Light Modulators ◽  
Induced Flow

AbstractFerroelectric liquid crystals remain of interest for display and spatial light modulators because they exhibit significantly faster optical response times than nematics. However, smectic layers are sensitive to shock-induced flow and are usually permanently displaced once a well-aligned sample is disrupted, rendering such devices inoperable. We introduce a vertical alignment geometry combined with a surface-relief grating to control both the smectic layer and director orientations. This mode undergoes “self-healing” of the smectic layers after disruption by shock-induced flow. Sub-millisecond switching between optically distinct states is demonstrated using in-plane electric fields. Self-healing occurs within a second after being disrupted by shock, wherein both the layer and director realign without additional external stimulus. The route to material improvements for optimised devices is discussed, promising faster spatial light modulators for high-speed adaptive optics, micro-displays for virtual/augmented reality and telecommunications with inherent shock stability.

scholarly journals Diffraction Efficiency Characteristics for MEMS-Based Phase-Only Spatial Light Modulator with Nonlinear Phase Distribution

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 62
Author(s):  
Remington S. Ketchum ◽  
Pierre-Alexandre Blanche
Keyword(s):  
Diffraction Efficiency ◽  
High Speed ◽  
Phase Distribution ◽  
Complex Structure ◽  
Spatial Light Modulators ◽  
Light Modulator ◽  
Micro Electro Mechanical Systems ◽  
Light Modulators ◽  
Nonlinear Phase ◽  
Liquid Crystal On Silicon

Micro-electro mechanical systems (MEMS)-based phase-only spatial light modulators (PLMs) have the potential to overcome the limited speed of liquid crystal on silicon (LCoS) spatial light modulators (SLMs) and operate at speeds faster than 10 kHz. This expands the practicality of PLMs to several applications, including communications, sensing, and high-speed displays. The complex structure and fabrication requirements for large, 2D MEMS arrays with vertical actuation have kept MEMS-based PLMs out of the market in favor of LCoS SLMs. Recently, Texas Instruments has adapted its existing DMD technology for fabricating MEMS-based PLMs. Here, we characterize the diffraction efficiency for one of these PLMs and examine the effect of a nonlinear distribution of addressable phase states across a range of wavelengths and illumination angles.

Ferroelectric liquid crystal with sub-wavelength helix pitch as an electro-optical medium for high-speed phase spatial light modulators

2021 ◽  
Vol 135 ◽  
pp. 106711
Author(s):  
Svetlana P. Kotova ◽  
Evgeny P. Pozhidaev ◽  
Sergey A. Samagin ◽  
Vladimir V. Kesaev ◽  
Vadim A. Barbashov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
High Speed ◽  
Spatial Light Modulators ◽  
Ferroelectric Liquid Crystal ◽  
Optical Medium ◽  
Light Modulators ◽  
Helix Pitch ◽  
Sub Wavelength

scholarly journals High-speed multiplane structured illumination microscopy of living cells using an image-splitting prism

Nanophotonics ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 143-148
Author(s):  
Adrien Descloux ◽  
Marcel Müller ◽  
Vytautas Navikas ◽  
Andreas Markwirth ◽  
Robin van den Eynde ◽  
...  
Keyword(s):  
High Speed ◽  
Three Dimensional ◽  
Super Resolution ◽  
Optical Element ◽  
Spatial Light Modulators ◽  
Structured Illumination ◽  
Structured Illumination Microscopy ◽  
Image Stack ◽  
Light Modulators ◽  
3D Information

AbstractSuper-resolution structured illumination microscopy (SR-SIM) can be conducted at video-rate acquisition speeds when combined with high-speed spatial light modulators and sCMOS cameras, rendering it particularly suitable for live-cell imaging. If, however, three-dimensional (3D) information is desired, the sequential acquisition of vertical image stacks employed by current setups significantly slows down the acquisition process. In this work, we present a multiplane approach to SR-SIM that overcomes this slowdown via the simultaneous acquisition of multiple object planes, employing a recently introduced multiplane image splitting prism combined with high-speed SIM illumination. This strategy requires only the introduction of a single optical element and the addition of a second camera to acquire a laterally highly resolved 3D image stack. We demonstrate the performance of multiplane SIM by applying this instrument to imaging the dynamics of mitochondria in living COS-7 cells.

High-speed liquid-crystal-on-silicon spatial light modulators using high-voltage circuitry

1995 ◽  
Vol 20 (3) ◽  
pp. 342 ◽  
Author(s):  
Chongchang Mao ◽  
Douglas J. McKnight ◽  
Kristina M. Johnson
Keyword(s):  
Liquid Crystal ◽  
High Voltage ◽  
High Speed ◽  
Spatial Light Modulators ◽  
Light Modulators ◽  
Liquid Crystal On Silicon

Practical issues for the use of liquid crystal spatial light modulators in adaptive optics

1998 ◽  
Vol 148 (4-6) ◽  
pp. 323-330 ◽  
Author(s):  
G.T Bold ◽  
T.H Barnes ◽  
J Gourlay ◽  
R.M Sharples ◽  
T.G Haskell
Keyword(s):  
Liquid Crystal ◽  
Adaptive Optics ◽  
Spatial Light Modulators ◽  
Light Modulators

Optical image correlation using high-speed multiple quantum well spatial light modulators

1999 ◽  
Author(s):  
Keith Kang ◽  
Jeffry S. Powell ◽  
Richard D. Stack ◽  
Charles G. Garvin ◽  
John A. Trezza ◽  
...  
Keyword(s):  
Quantum Well ◽  
High Speed ◽  
Multiple Quantum Well ◽  
Optical Image ◽  
Image Correlation ◽  
Spatial Light Modulators ◽  
Multiple Quantum ◽  
Light Modulators

scholarly journals Microscope-Cockpit: Python-based bespoke microscopy for bio-medical science

2021 ◽  
Vol 6 ◽  
pp. 76
Author(s):  
Mick A. Phillips ◽  
David Miguel Susano Pinto ◽  
Nicholas Hall ◽  
Julio Mateos-Langerak ◽  
Richard M. Parton ◽  
...  
Keyword(s):  
Open Source ◽  
Adaptive Optics ◽  
High Performance ◽  
Medical Science ◽  
Machine Learning Algorithms ◽  
Spatial Light Modulators ◽  
Structured Illumination ◽  
Light Modulators ◽  
Wide Range ◽  
User Friendly

We have developed “Microscope-Cockpit” (Cockpit), a highly adaptable open source user-friendly Python-based Graphical User Interface (GUI) environment for precision control of both simple and elaborate bespoke microscope systems. The user environment allows next-generation near instantaneous navigation of the entire slide landscape for efficient selection of specimens of interest and automated acquisition without the use of eyepieces. Cockpit uses “Python-Microscope” (Microscope) for high-performance coordinated control of a wide range of hardware devices using open source software. Microscope also controls complex hardware devices such as deformable mirrors for aberration correction and spatial light modulators for structured illumination via abstracted device models. We demonstrate the advantages of the Cockpit platform using several bespoke microscopes, including a simple widefield system and a complex system with adaptive optics and structured illumination. A key strength of Cockpit is its use of Python, which means that any microscope built with Cockpit is ready for future customisation by simply adding new libraries, for example machine learning algorithms to enable automated microscopy decision making while imaging.

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