Scanned Laser Pico-Projectors: Seeing the Big Picture (with a Small Device)

Freeman, Mark O.; Champion, M.; Madhavan, Sid

doi:10.1364/opn.20.5.000028

Cited by 77 publications

(38 citation statements)

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“…By repetitive horizontal and vertical scanning, the device is able to project images with 1799 × 799 pixel resolution at 60 Hz. [36] To match the absorption band of the photoalignment material (Brilliant Yellow, 8 in Figure 3), [37] we only used the blue laser diode for photopatterning. Before illuminating the alignment layer, a rotating linear polarizer was used to control the light polarization direction (and thus the molecular alignment direction, which is in the plane of the sample and perpendicular to the light polarization), and a lens (f = 30 mm) projected the image onto the sample plane.…”

Section: Resultsmentioning

confidence: 99%

Programming Photoresponse in Liquid Crystal Polymer Actuators with Laser Projector

Wani

Zeng

Wasylczyk

et al. 2017

Advanced Optical Materials

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have emerged as promising materials for fabricating soft actuators. [12][13][14] LCNs combine the anisotropy of the constituent liquid-crystal (LC) molecules and the elasticity of polymer networks, and are capable of stimuli-responsive shape change at the macroscopic scale. LCNs can be actuated by various stimuli such as light, [15] heat, [16] solvent, [17] and humidity. [18] Being a clean, remote, and precisely controllable stimulus, light is a particularly attractive energy source. [19] The light-triggered deformation of an LCN actuator is governed by the alignment distribution of the constituent liquid-crystal molecules within the polymer network, and developing methods for precise control over the director distribution in order to obtain desired photoactuation mode is an important topic of research. [14,[20][21][22] Photoalignment has proven to be a successful technique in patterning complex alignments into liquid-crystalline materials [23][24][25] and in devising on-demand actuations into LCNs. [21] The technique is based on illuminating a thin photoresponsive layer, a "command surface," [26] with linearly polarized light. Upon illumination, the photoalignment layer becomes anisotropic, thereby changing the boundary conditions experienced by the liquid-crystal molecules in the vicinity, and forcing them to align either perpendicular [27] or parallel [28] to the light polarization. Photopatterning of director orientation can be achieved by spatially modulating the light polarization, [27] or exposure through mask(s). [28,29] White and co-workers have used a laser setup to raster scan a focussed laser beam with controlled polarization across the sample, and thus achieved local control in the director distribution. [30][31][32] Also spatial light modulators and digital micromirror devices have been used for high-throughput patterning. [17,[33][34][35] These demonstrations require either prepatterned masks or relatively complex optical set-ups for programming the desired director distribution.Herein, we use a laser projector with a microelectromechanical system (MEMS)-based scanning mirror assembly (PICO, Sony) to program the liquid-crystal alignment within a monolithic LCN film. Photopatterning is achieved by projecting an arbitrary computer-generated image onto the photoalignment layer, using predefined light polarization. The projector is capable of addressing a minimum feature size of 50 µm over an area of 25 × 14 mm 2 . A series of complex photoactuators, such as defect buckling, coiling strip with gradient in pitch, four-arm gripper, and bidirectional bending in an octopod, are demonstrated by engineering different director orientations via photopatterning. The photoactuators are fabricated by polymerizing LC monomer mixtures inside LC cells that have been A versatile, laser-projector-based method is demonstrated for programming alignment patterns into monolithic films of liquid crystal polymer networks. Complex images can be photopatterned into the polymer films with sub-100 µm resolution, using relative...

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Section: Resultsmentioning

confidence: 99%

Programming Photoresponse in Liquid Crystal Polymer Actuators with Laser Projector

Wani

Zeng

Wasylczyk

et al. 2017

Advanced Optical Materials

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“…In the region 1.5 ≤  ≤ 100, we know from Freeman et al [4] In summary, then, we have that the maximum radiometric power depends upon three terms; r 2 , since only a fraction of the radiation is delivered to the eye, r -1 or a constant, depending upon the source angular extent determined by the distance at which the radiation is measured, and r …”

Section: Classmentioning

confidence: 80%

Letter: On proximity detection systems for pico‐projectors

Buckley¹

2012

J Soc Info Display

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“…4a, we show the transparent display at work, with a blue MIT logo projected onto the screen from a small laser projector (MicroVision SHOWWX þ ). This projector is suitable here since it functions by projecting monochromatic light from three laser diodes (red, green and blue) 25 ; we measure the wavelength of its blue light to be 458 ± 2 nm. The projected image shows up clearly on our screen, and is visible from all directions.…”

Section: Conceptmentioning

confidence: 99%

Transparent displays enabled by resonant nanoparticle scattering

et al. 2014

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The ability to display graphics and texts on a transparent screen can enable many useful applications. Here we create a transparent display by projecting monochromatic images onto a transparent medium embedded with nanoparticles that selectively scatter light at the projected wavelength. We describe the optimal design of such nanoparticles, and experimentally demonstrate this concept with a blue-color transparent display made of silver nanoparticles in a polymer matrix. This approach has attractive features including simplicity, wide viewing angle, scalability to large sizes and low cost.

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Scanned Laser Pico-Projectors: Seeing the Big Picture (with a Small Device)

Cited by 77 publications

References 0 publications

Programming Photoresponse in Liquid Crystal Polymer Actuators with Laser Projector

Programming Photoresponse in Liquid Crystal Polymer Actuators with Laser Projector

Letter: On proximity detection systems for pico‐projectors

Transparent displays enabled by resonant nanoparticle scattering

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