High speed, complex wavefront shaping using the digital micro-mirror device

AbstractDigital micro-mirror devices (DMDs) have been deployed in many optical applications. As compared to spatial light modulators (SLMs), they are characterized by their much faster refresh rates (full-frame refresh rates up to 32 kHz for binary patterns) compared to 120 Hz for most liquid crystal SLMs. DMDs however can only display binary, unipolar patterns and utilize temporal modulation to represent with excellent accuracy multiple gray-levels in display applications. We used the built-in time domain dynamic range representation of the DMD to project 8-bit complex-fields. With this method, we demonstrated 8-bit complex field modulation with a frame time of 38.4 ms (around 0.15 s for the entire complex-field). We performed phase conjugation by compensating the distortions incurred due to propagation through free-space and a scattering medium. For faster modulation speed, an electro-optic modulator was used in synchronization with the DMD in an amplitude modulation mode to create grayscale patterns with frame rate ~ 833 Hz with display time of only 1.2 ms instead of 38.4 ms for time multiplexing gaining a speed up by a factor of 32.

Download Full-text

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

Photonics ◽

10.3390/photonics8030062 ◽

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.

Download Full-text

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

Optics & Laser Technology ◽

10.1016/j.optlastec.2020.106711 ◽

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

Download Full-text

Ways of the high-speed increasing of magneto-optical spatial light modulators

10.1117/12.45017 ◽

1991 ◽

Cited By ~ 3

Author(s):

Vladimir V. Randoshkin

Keyword(s):

High Speed ◽

Spatial Light Modulators ◽

Light Modulators

Download Full-text

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

Nanophotonics ◽

10.1515/nanoph-2019-0346 ◽

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.

Download Full-text