Optically addressed spatial light modulator: performance and applications

Collings, N.; Mias, Solon; Wilkinson, Timothy D.; Travis, Adrian; Moore, J.; Crossland, W. A.

doi:10.1117/12.509192

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Moreover, the basic logic gates are also possible to be implemented by using the spatial light modulator (SLM) and savart plate, exploiting the advantages of optics and optoelectronics [4][5][6] in the optical tree architecture (OTA). The modified signed-digit (MSD) number system is an extension of the base-2 system for the representation of both positive and negative numbers and capable of carry-free addition and borrow-free subtraction operations.…”

mentioning

confidence: 99%

Parity generator and parity checker in the modified trinary number system using savart plate and spatial light modulator

Ghosh

2010

Optoelectron. Lett.

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The parity generators and the checkers are the most important circuits in communication systems. With the development of multi-valued logic (MVL), the proposed system with parity generators and checkers is the most required using the recently developed optoelectronic technology in the modified trinary number (MTN) system. This system also meets up the tremendous needs of speeds by exploiting the savart plates and spatial light modulators (SLM) in the optical tree architecture (OTA).The modified trinary number (MTN) system finds its importance because of its carry and borrow free arithmetic operations [1][2][3] . Moreover, the basic logic gates are also possible to be implemented by using the spatial light modulator (SLM) and savart plate, exploiting the advantages of optics and optoelectronics [4][5][6] in the optical tree architecture (OTA). The modified signed-digit (MSD) number system is an extension of the base-2 system for the representation of both positive and negative numbers and capable of carry-free addition and borrow-free subtraction operations. This number representation system in trinary is called as the modified trinary number (MTN) system [7] and leads to higher information density.The parity bit/trit play the most important role in the verification of information transmission. The parity generator and checker have a lot of applications in communications. To implement them in the MTN system, different logical states and the implementation of different logic gates [7][8][9][10][11] are introduced here.In the MTN system, rather than two states in the case of binary logic, three distinct states to represent 1, 0 and 1 _ must be generated. The logical formulation is based on the definition of 1, 0 and 1 _ as

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confidence: 99%

Parity generator and parity checker in the modified trinary number system using savart plate and spatial light modulator

Ghosh

2010

Optoelectron. Lett.

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“…A PIN photodiode has been used for high-speed OASLM and its response time is mainly limited by the RC time constant [9][10][11]. For instance, binary OASLMs using PIN photodiode of hydrogenated amorphous silicon (a-Si:H) and ferroelectric LC was reported to have a response time of 155 µs and resolution of 40 lp mm −1 [12,13].…”

Section: Introductionmentioning

confidence: 99%

Reduction of response time in transmissive optically addressed spatial light modulator using solution-based ZnO NP/PEDOT:PSS heterojunction

Chang

Shrestha

et al. 2020

J. Opt.

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An optically addressed spatial light modulator (OASLM) works by using the intensity of a ‘write’ light to modulate the phase of a ‘read’ light. OASLM using ZnO nanoparticles (NPs) as a photoconductor is important to holographic displays because of its record-high spatial resolution. However, its response time to the write light is long and the switch-off time (τoff) can take tens of seconds due to the trap states in the ZnO NP layer. This results in residual images and poses limitations to its application in dynamic holographic displays. In this work, a ZnO NP photoconductor was replaced by a solution-processed ZnO NP/PEDOT:PSS heterojunction photodiode and the τoff of OASLM was significantly reduced to about 0.6 s. Electrical and optical properties of the heterojunction were characterized and a barrier height of 0.604 eV was determined by CV measurement. The heterojunction-based OASLM was then fabricated and its light modulating performance was investigated by using a diffractive phase grating. Finally, impedance spectroscopy was used to analysis the device equivalent circuit and optimize the operation of the OASLM.

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“…Optically addressed spatial light modulators (OASLM) are based on optically addressed photoconductor layer. In combination with transparent electrodes and voltage sources, they cause the reorientation of a liquid crystal layer [4,6,7].…”

Section: Introductionmentioning

confidence: 99%

Optically addressed modulator for tunable spatial polarization control

Schaal¹,

Rutloh²,

Weidenfeld³

et al. 2018

Opt. Express

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We present an optically addressed non-pixelated spatial light modulator. The system is based on reversible photoalignment of a LC cell using a red light sensitive novel azobenzene photoalignment layer. It is an electrode-free device that manipulates the liquid crystal orientation and consequently the polarization via light without artifacts caused by electrodes. The capability to miniaturize the spatial light modulator allows the integration into a microscope objective. This includes a miniaturized 200 channel optical addressing system based on a VCSEL array and hybrid refractive-diffractive beam shapers. As an application example, the utilization as a microscope objective integrated analog phase contrast modulator is shown.

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Optically addressed spatial light modulator: performance and applications

Cited by 8 publications

References 22 publications

Parity generator and parity checker in the modified trinary number system using savart plate and spatial light modulator

Parity generator and parity checker in the modified trinary number system using savart plate and spatial light modulator

Reduction of response time in transmissive optically addressed spatial light modulator using solution-based ZnO NP/PEDOT:PSS heterojunction

Optically addressed modulator for tunable spatial polarization control

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