Holographic superresolution using spatial light modulator

Hussain, Anwar; Martínez, José Luis; Campos, Juan

doi:10.2971/jeos.2013.13007

Cited by 12 publications

(10 citation statements)

References 12 publications

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“…Finally, we remark that by taking profit of the polyvalence of the SLM device, the super-resolution module could be modified to apply other super-resolution imaging techniques [6,37]. In this way, when the main resolution limitation on the imaging system is not originated by the CCD pixel size, a more suitable super-resolution technique, based on SLM technology, should be selected.…”

Section: Discussionmentioning

confidence: 98%

“…However, we want to emphasize the potential of including an LCoS display in the proposed set-up. In particular, different super-resolution techniques based on LCoS technology are proposed in the literature [6,37], which are not addressed to detector-limited resolution but to diffraction-limited resolution. Therefore, by conducting some modifications in the super-resolution module in the experimental set-up, the concept of using super-resolved images for polarimetry analysis could be adapted and tested for other origins of the optical system resolution limit.…”

Section: Imaging Stokes Polarimetermentioning

confidence: 99%

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Polarization imaging with enhanced spatial resolution

Peinado

Lizana

Iemmi

et al. 2015

Optics Communications

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Section: Discussionmentioning

confidence: 98%

Section: Imaging Stokes Polarimetermentioning

confidence: 99%

Polarization imaging with enhanced spatial resolution

Peinado

Lizana

Iemmi

et al. 2015

Optics Communications

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“…In Ref [13], a setup based on sequentially tilted beams illumination of the object in off-axis interferometery was used to achieve superresolution imaging. Here, with the will of going a step further, two main improvements have been performed on the setup, which is sketched in Fig.…”

Section: Working Principles Of the Experimental Setupmentioning

confidence: 99%

“…In these techniques amplitude and phase grating were used to increase the resolution. Later on the fringe illumination [10,11] and tilted beam illumination [12,13] were tested to shift the spectrum of the object into the pass band at Fourier plane in 4f optical system.…”

Section: Introductionmentioning

confidence: 99%

Super resolution imaging achieved by using on-axis interferometry based on a Spatial Light Modulator

Hussain¹,

Martínez²,

Lizana³

et al. 2013

Opt. Express

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An interferometry based method to achieve resolution beyond the diffraction barrier is proposed. Object is illuminated with different tilted beams, generated by using a Spatial Light Modulator (SLM). In addition, some constant phases are also assigned to each tilted beam with the SLM display. Then, the object is simultaneously illuminated with all tilted beams, producing an on-axis interferometry scheme. An interferogram at the image plane is formed for each set of constant phases added to the tilted beams. Using proper selection of constant phases for each of the interferograms, the synthetic aperture can be calculated. During the post processing, we take the Fourier transforms of the each image and the portions of the spectrum are spatially shifted and combined to obtain synthesized spectrum whose inverse Fourier transform gives high resolution image.

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“…Unlike amplitude-modulating LCOS devices (mainly for video and image projections), phase-only modulating LCOS devices have a wide range of applications based on the spatial modulation of coherent lights, [14][15][16] including real-time holography, 17 optical correlators, 18 wavelength selective switches, 19,20 reconfigurable optical add-drop multiplexers [20][21][22] and diffractive optical components. [23][24][25] The first attempt to drive an LC pixel array from a single crystal silicon active backplane was proposed by Ernstoff et al 26 in the early 1970s.…”

Section: Brief Introduction To Lcos Devicesmentioning

confidence: 99%

Fundamentals of phase-only liquid crystal on silicon (LCOS) devices

2014

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This paper describes the fundamentals of phase-only liquid crystal on silicon (LCOS) technology, which have not been previously discussed in detail. This technology is widely utilized in high efficiency applications for real-time holography and diffractive optics. The paper begins with a brief introduction on the developmental trajectory of phase-only LCOS technology, followed by the correct selection of liquid crystal (LC) materials and corresponding electro-optic effects in such devices. Attention is focused on the essential requirements of the physical aspects of the LC layer as well as the indispensable parameters for the response time of the device. Furthermore, the basic functionalities embedded in the complementary metal oxide semiconductor (CMOS) silicon backplane for phase-only LCOS devices are illustrated, including two typical addressing schemes. Finally, the application of phase-only LCOS devices in real-time holography will be introduced in association with the use of cutting-edge computer-generated holograms. The architecture of LCOS devices is similar to conventional LC devices except that a silicon backplane constitutes one of the substrates (Figure 1). The silicon CMOS backplane consists of the electronic circuitry that is buried underneath pixel arrays to provide a high 'fill factor'. The pixels are aluminum mirrors deposited on the surface of the silicon backplane. The incident light is transmitted through the LC layer with almost zero absorption. The integration of high-performance driving circuitry allows the applied voltage to be changed on each pixel, thereby controlling the phase retardation of the incident wavefront across the device. Currently, there are two types of light modulation using LCOS devices, amplitude modulation and phase modulation. In the former case, the amplitude of the light signal is modulated 6,7 by varying the linear polarzation direction of the incident light passing through a linear polarizer, the same principle used in a standard LC television. In the latter case, the phase delay is accomplished by electrically adjusting the optical refractive index along the light path, which is possible because of the non-zero birefringence of the LC materials in use but should be carefully characterized. [8][9][10][11][12][13] In a phase-only LCOS SLM modulator, no light absorption by polarizers or other light-absorbing components will occur, such that the maximum light efficiency can be expected.Currently, most of the conventional LC devices are not able to efficiently modulate the phase of an incident wavefront. For instance, the LC device structure using thin film transistors is not suitable for phase modulation because an appropriate electro-optic effect has not been used (see the section on 'Twisted nematic (TN) configuration' and the section on 'VAN configuration' for details). Moreover, the pixels of this type of device are too large to provide acceptably large diffraction angles. In addition, the pixel circuitry and connection tracks are in the light path such that the ...

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Holographic superresolution using spatial light modulator

Cited by 12 publications

References 12 publications

Polarization imaging with enhanced spatial resolution

Polarization imaging with enhanced spatial resolution

Super resolution imaging achieved by using on-axis interferometry based on a Spatial Light Modulator

Fundamentals of phase-only liquid crystal on silicon (LCOS) devices

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