Ching-Cherng Sun

National Yang Ming Chiao Tung University

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Co-Authors

Wei-Chia Su

National Changhua University of Education

Tsung‐Hsun Yang

National Central University

Bor Wang

National Central University

Ming Chang

Air Force Communication NCO Academy

Tun-Chien Teng

National Taiwan Normal University

Chih-Yuan Hsu

National Cheng Kung University

Tsung-Xian Lee

National Central University

W.T. Kary Chien

Beibu Gulf University

Yueh Ouyang

Université Laval

Chia-Hao Wu

MingDao University

Cooperative Institutions

National Central University

National Cheng Kung University

National Yang Ming Chiao Tung University

Chung Yuan Christian University

National Tsing Hua University

National Chung Shan Institute of Science and Technology

Beijing Jiaotong University

R.O.C Military Academy

Northeastern University

Fudan University

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Dynamic Control of Polarization and Diffraction in Tunable Surface-Relief Liquid-Crystal Gratings

Pravinraj Selvaraj Chih‐Wei Lin Chi‐Tang Huang Ching-Cherng Sun Ko‐Ting Cheng

Diffraction efficiency

10.2139/ssrn.5096445

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Random phase multiplexing for volume holographic storage

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2005)

Ching-Cherng Sun Tun-Chien Teng Chih-Yuan Hsu Wei-Chia Su

Two volume holographic storage schemes using random phase multiplexing technique are presented. A ground glass is spatially shifted to multiplex the signals for both storage schemes. The diffraction selectivity of the ground glass is experimental investigated and theoretically analyzed.

Holographic Data Storage

Diffraction efficiency

10.1117/12.577293

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Development of a human eye model for visual performance assessment

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2009)

Chong-Jhih Jiang Yi-Chun Chen Tsung‐Hsun Yang Ching-Cherng Sun

A biometry-based human eye model was developed by using the empirical anatomic and optical data of ocular parameters. The gradient refractive index of the crystalline lens was modeled by concentric conicoid isoindical surfaces and was adaptive to accommodation and age. The chromatic dispersion of homogeneous ocular media was described by Cauchy equations. The gradient equations for the refractive index of crystalline lens were modified at particular wavelengths according to the same dispersion model. Mie scattering was introduced to simulate volumetric light scattering in the crystalline lens. The optical performance of the eye model was evaluated in CodeV and ASAP and presented by the modulation transfer function (MTF) at single and multiple wavelengths. The chromatic optical powers obtained from this model matched that of physiological eyes. The scattering property was assessed by means of glare veiling luminance and compared with CIE general disability glare equation. This model is highly potential for investigating visual performance in ordinary lighting and display conditions and under the influence of glare sources.

Human eye

Chromatic aberration

GLARE

Optical transfer function

10.1117/12.825974

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Optical encryption and decryption in security-volume holograms

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2003)

Wei-Chia Su Ching-Cherng Sun Yueh Ouyang

An optical security holographic memory encrypted by a random phase key and decrypted by a holographic key (a holographic optical element; HOE) is presented and demonstrated. The security hologram is based on protecting the access to the memory from the unauthorized users by encoding the reference waves. The holographic decryption key is fabricated by storing the wavefront information of the set of reference beams. Each addressed reference beam is stored in the HOE through holographic multiplexing technique. The decryption process is achieved by using the reconstruction reference beam to access the secure data. This security hologram system is suitable for practical application since the decryption key can be controlled copied. As to our best knowledge, this is the first experimental impementation to replace a random phase mask key.

Reference beam

10.1117/12.505556

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Citations (1)

Shifting tolerance of a 3D object of a volume-holographic spatial filter

Chih‐Yuan Hsu Ching-Cherng Sun Chia-Hao Wu Wei-Chia Su

We propose a volume-holographic filter to perform 3D object filtering. Theoretical analysis and the corresponding experiment of the shifting tolerance of the volume-holographic filter are demonstrated.

10.1109/cleopr.2003.1274656

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Photorefractive incoherent-to-coherent optical converter based on anisotropic self-diffraction in BaTiO_3

Applied Optics (1998)

Ching-Cherng Sun Bor Wang Jenq-Yang Chang

A photorefractive incoherent-to-coherent optical converter (PICOC) is demonstrated; conversion is accomplished by anisotropic self-diffraction in BaTiO3. The setup of the PICOC is easy, and only two writing beams are required. The diffraction efficiency reaches 50%, and the resolution is 22 line pairs (lp)/mm in a typical-size crystal. Further, the resolution reaches 40 lp/mm when a BaTiO3:Rh crystal of thickness 1.2 mm is used, and the diffraction efficiency is as high as 51%. The resolution of the PICOC can be increased effectively by reduction of the crystal thickness with no penalty for low diffraction efficiency.

Diffraction efficiency

Crystal (programming language)

10.1364/ao.37.008247

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Citations (10)

Optical transmittance of high-efficiency cavity with photon recycling

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2011)

Che-Chu Lin Xuan-Hao Lee W.T. Kary Chien Hen-Xiang Chen Ching-Cherng Sun

A planar-exit lighting surface is not only used in the luminaires but also useful in the display backlights and other illumination systems. Most planar-exit lighting surfaces are made by edge-lit with line light source or 1-D LED array. If it is not edge-lit type, the light source can be two-dimensional, but a cavity is required. In this paper, a high-efficiency cavity providing extremely high energy transmittance with photon recycling is reported and demonstrated. The cavity contains a diffuser and the high reflectivity surfaces. The optical efficiency of the cavity is calculated by a formula with considering photon recycling. Furthermore, various kinds of diffusers are applied to change the optical transmittance as well as the light pattern. When the reflectivity of the inner wall of the lighting cavity is about 96 %, the optical efficiency of the cavity is higher than 90 % with several diffusers. The experimental measurement as well as the calculation is demonstrated in the paper.

Diffuser (optics)

Optical cavity

Visible spectrum

10.1117/12.893230

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LED packaging for extremely uniform angular CCT distribution

Ching Yi Chen Yu-Yu Chang Tsung‐Hsun Yang Ching-Cherng Sun

A precise simulation and detailed design of ACCTD of white LEDs from 2800K to 6500K are presented. The best results of ACCTD in the simulation and experiment are 105K and 182K near 6500K, respectively.

10.1364/soled.2012.lm4a.1

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Analysis of position-dependent light extraction of GaN-based LEDs

Optics Express (2005)

Tsung-Xian Lee Chao-Ying Lin Shih-Hsin Ma Ching-Cherng Sun

The light extraction efficiency of GaN-based LEDs as a function of the position of the light source over the active layer is studied. Several parameters, including chip dimensions, absorption coefficients and package are analyzed on the basis of a Monte-Carlo ray tracing simulation. The light extraction efficiency of a Thin-GaN LED is studied with respect to a sapphire-based LED, including the surface texture.

Position (finance)

Integrating sphere

10.1364/opex.13.004175

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Citations (79)

<title>Optical security by use of a randomly selected binary phase code</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1999)

Bor Wang Ching-Cherng Sun Wei-Chia Su

An optical security system using a random selected binary phase code is proposed. A random binary phase encoded light is incident on a holographic recording material and writes gratings in the material with a reference plane wave. The recording material can be regarded as an optical lock while the phase code acts as the key. As the pixel number is 5 X 20, the decryption probability is less than 10^-10 when arbitrary phase code is used for decryption. The decryption probability decreases dramatically as the pixel number increases. Furthermore, the security system performs good tolerance to data loss of the phase code.

Code (set theory)

Binary code

Lock (firearm)

Binary data

10.1117/12.363964

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