Implementation of phase-shift patterns using a holographic projection system with phase-only diffractive optical elements

July, 2011

Author(s): Wei-Feng Hsu, Yu-Wen Chen, and Yuan-Hong Su

Abstract:

“We proposed a method to implement spatial phase-shift patterns with subdiffraction limited features through a holographic projection system. The input device of the system displayed phase-only diffractive optical elements that were calculated using the iterative Fourier-transform algorithm with the dummy-area method. By carefully designing the target patterns to the algorithm, the diffractive optical elements generated the Fourier-transformed images containing the phase-shift patterns in which the widths of dark lines were smaller than the diffraction limit. With these demonstrations, we have successfully shown that the near-field phase-shift lithographic technique can be realized through an inexpensive maskless lithographic system and can still achieve subdiffraction limited images.”

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Publication: Applied Optics, (subscription required)

Issue/Year/DOI: Applied Optics, Vol. 50, Issue 20, pp. 3646-3652 (2011)
doi:10.1364/AO.50.003646


The Applications and Technology of Phase-Only Liquid Crystal on Silicon Devices

July, 2010

Author(s): Collings, N.; Davey, T.; Christmas, J.; Chu, D.; Crossland, B.

Abstract:

“An introduction to the technology of liquid crystal on silicon (LCOS) devices leads on to a discussion of the application areas which have been and are being opened up by the development of phase-only devices.”

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Publication: Journal of Display Technology, (subscription required)

Issue/Year/DOI: Journal of Display Technology, Vol. 7, Issue 3, pp. 112-119 (2010)
doi:10.1109/JDT.2010.2049337


Speed-up of hologram generation using ClearSpeed Accelerator board

October, 2009

Author(s): Noriyuki Tanabe, Yasuyuki Ichihashi, Hirotaka Nakayama, Nobuyuki Masuda and Tomoyoshi Ito

Abstract:

“We have sped up the calculation of a computer-generated hologram by parallel computing using ClearSpeed Advance Dual CSX600 PCI-X Accelerator Board by ClearSpeed Technology plc. By using two boards in parallel, our system was able to perform the calculation 50 times as fast as a personal computer.”

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Publication: Computer Physics Communications – via ScienceDirect.com (subscription required)

Issue/Year/DOI: Computer Physics Communications, Volume 180, Issue 10, October 2009, Pages 1870-1873
doi:10.1016/j.cpc.2009.06.001


Superhydrophobic surface structures in thermoplastic polymers by interference lithography and thermal imprinting

September, 2009

Author(s): Christian W.J. Berendsen, Marek Škereň, David Najdek and František Cerný

Abstract:

“We present a method to produce superhydrophobic surfaces in thermoplastic polymer substrates. The method involves the creation of a nickel stamp using a customized laser interference lithography technique and electroplating processes. This stamp is used to emboss sub-micrometer periodic structures into the thermoplastic. The modified surface is coated with a hydrophobic plasma-polymerized hexafluoropropene layer. Surfaces with different periodicity and relief depth were created. On the surface with the highest aspect ratio, advancing water contact angles of 167° were measured with a water contact angle hysteresis of below 5°.”

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Publication: Applied Surface Science – ScienceDirect.com (subscription required)

Issue/Year/DOI: Applied Surface Science, Volume 255, Issue 23, 15 September 2009, Pages 9305-9310
doi:10.1016/j.apsusc.2009.07.001


A novel three-dimensional holographic display system based on LC-R2500 spatial light modulatora

March, 2009

Author(s): Huadong Zheng, Yingjie Yu, Cuixia Dai

Abstract:

“A novel holographic display system is proposed in this paper. The system takes LC-R2500, a kind of reflective liquid crystal spatial light modulator, (LC-SLM) as the core display unit, which can meet the requirement of real-time reconstruction of three-dimensional (3D) objects from holograms in free space. The relationship between hologram recording and image reconstruction is discussed, and the parameters associated with the magnification of reconstructed image over original object are determined. Experimental results of holographic display using the system are also given in the end.”

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Publication: Optik – International Journal for Light and Electron Optics – via ScienceDirect.com, (subscription required)

Issue/Year/DOI: Optik – International Journal for Light and Electron Optics, Volume 120, Issue 9, May 2009, Pages 431-436
doi:10.1016/j.ijleo.2007.11.002


Phase Contrast Projection Display Using Photopolymer

December, 2008

Author(s): Piao, Mei-Lan; Kim, Nam; Park, Jae-Hyeung

Abstract:

“We propose a phase contrast filter using photopolymer, for the phase contrast projection display. The photopolymer has high photosensitivity such that its optically induced refractive index change has a linear dependency on the illuminating light intensity. We implemented a phase contrast projection display using photopolymer as a phase contrast filter. By controlling the refractive index change of the photopolymer, we successfully convert an input phase image into a high contrast intensity image. We also investigated the effect of the photopolymer illumination condition on the quality of the displayed intensity image. As a projector, we achieved 82% phase to intensity conversion efficiency, which implies that the proposed method can potentially have much higher light efficiency than conventional projection display.”

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Publication: Journal of the Optical Society of Korea, (free download)

Issue/Year/DOI: Journal of the Optical Society of Korea, Volume 12, Issue 4, December 2008, pp.319-325
DOI : 10.3807/JOSK.2008.12.4.319


Structured illumination in total internal reflection fluorescence microscopy using a spatial light modulator

July, 2008

Author(s): Reto Fiolka, Markus Beck, and Andreas Stemmer

Abstract:

“In wide-field fluorescence microscopy, illuminating the specimen with evanescent standing waves increases lateral resolution more than twofold. We report a versatile setup for standing-wave illumination in total internal reflection fluorescence microscopy. An adjustable diffraction grating written on a phase-only spatial light modulator controls the illumination field. Selecting appropriate diffraction orders and displaying a sheared (tilted) diffraction grating allows one to tune the penetration depth in very fine steps. The setup achieves 91 nm lateral resolution for green emission.”

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Publication: Optics Letters (subscription required)

Issue/Year/DOI: Optics Letters, Vol. 33, Issue 14, pp. 1629-1631
doi:10.1364/OL.33.001629


A Projection System for Real World Three-Dimensional Objects Using Spatial Light Modulators

June, 2008

Author(s): Gopinathan, U. Monaghan, D.S. Hennelly, B.M. McElhinney, C.P. Kelly, D.P. McDonald, J.B. Naughton, T.J. Sheridan, J.T.

Abstract:

“We discuss a projection system for real world three-dimensional objects using spatial light modulators (SLM). An algorithm to encode the digital holograms of real world objects on to an SLM is presented. We present results from experiments to project holograms of real world holograms using a nematic liquid crystal SLM. We discuss the case when the pixel sizes of the charge-coupled device (CCD) and SLM used for recording the hologram and projection are different.”

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Publication: Journal of Display Technology – via IEEE Xplore Digital Library (subscription required)

Issue/Year/DOI: Journal of Display Technology, Volume 4, Issue 2, June 2008, Pages 254-261
doi:10.1109/JDT.2007.913943


Projection display using computer-generated phase screens

February, 2008

Author(s): Neil Collings, Andreas Georgiou, Bill Crossland, and Jamie Christmas

Abstract:

“An approach to a robust and efficient projection display uses phasemodulating screens that reduce computer overhead.”

Link to Publications Page

Publication: SPIE Newsroom, (free download)

Issue/Year/DOI: SPIE Newsroom, 26 February 2008,
DOI: 10.1117/2.1200802.1015


An adaptive optics imaging system based on a high-resolution liquid crystal on silicon device

September, 2006

Author(s): Quanquan Mu, Zhaoliang Cao, Lifa Hu, Dayu Li, and Li Xuan

Abstract:

“An adaptive optics imaging system is introduced in this paper. A high resolution liquid crystal on silicon (LCOS) device was used as a phase only wave front corrector instead of a conversional deformable mirror. The wave front aberration was detected by a Shack-Hartmann (SH) wave front sensor, which has λ/100 rms wave front measurement accuracy. Under this construction 0.09λ (λ=0.6328µm) Peak to Valley correction precision was reached. Further more, some low frequency hot convection turbulence induced by an electric iron was compensated in real time at the same precision. The Modulation Transfer Function (MTF) of this system was also measured before and after wave front correction. Under the active correction of LCOS, the system reached the diffraction limited resolution approximately 65l p/mm on the horizontal direction. All of this showed the ability of using this device in high resolution, low temporal turbulence imaging system, such as retinal imaging, to improve the resolution performance.”

Link to Publications Page

Publication: Optics Express (free download)

Issue/Year/DOI: Optics Express, Vol. 14, Issue 18, pp. 8013-8018
doi:10.1364/OE.14.008013