Vol 24 No 2

The International Year of Light 2015 is launched at the opening ceremonies at the UNESCO headquarters in Paris, 19-20 January 2015. The International Year of Light is a global initiative that will highlight the importance of light and optical technologies in our daily lives, for the future, and for the development of society. It is a unique opportunity to inspire, educate, and connect the citizens of the world on a global scale. On 20 December 2013, The United Nations (UN) General Assembly 68th Session proclaimed 2015 as the International Year of Light and Light-based Technologies (IYL 2015).

In proclaiming an International Year focusing on the topic of light science and its applications, the United Nations has recognized the importance of raising global awareness about how light - based technologies promote sustainable development and provide solutions to global challenges in energy, education, agriculture and health. Light plays a vital role in our daily lives and is an imperative cross-cutting

discipline of science in the 21st century. It has revolutionized medicine, opened up international communication via the Internet, and continues to be central to linking cultural, economic and political aspects of the global society.

We are fortunate that this special issue is published in the International Year of Light 2015. In the spirit of the International Year of Light, this special issue is devoted to the recent progress on photonics. More specifically, the special issue includes:

photonics in information theory:

(1) Light and information

(2) Time, space, information and life;

photonics in biomedical application:

(3) Micro-prism test chip for surface Plasmon resonance;

(4) One-lens fluorescence microscope using CMOS image sensor;

(5) Laser module for acupuncture; and

(6) Fringe projection techniques using endoscopes;

photonics in speckle related application:

(7) Note on the use of interference terms of Wigner distribution function for specklegram analysis;

(8) Influence of space-time speckle effect on image in synthetic aperture imaging ladar; and

(9) Despeckle methods and their new application to laser projector;

photonics in holography:

(10) Rh-doped Bi₁₂TiO₂₀ photorefractive crystals and their applications in near infrared sensitive light valve devices; and

(11) Simulation of volume holographic storage system with VOHIL model;

photonics in correlator:

(12) Reduction of sidelobe energy by shifts in training images for the Mach-Zehnder joint transform correlator; and

(13) A hybrid method to improve the accuracy of multichannel volume holographic correlators;

photonics in radio frequency domain:

(14) Multi-port broadband adaptive RF power splitter employing an Opto-VLSI processor;

photonics in fiber laser:

(15) Analysis and experiment of Opto-DMD based multi-channel tunable fiber laser;

photonics in photonic crystal:

(16) Understanding photonic crystal from interference filter;

and photonics in radar imaging:

(17) Optical processing for radar imaging and broadband signal.

I take immense pleasure in writing this foreword to the special issue of Asian Journal of Physics. Guest edited by two prominent personalities and aptly titled “Recent Progress in Photonics”, the issue is a fine collection of articles relating to various aspects of photonics. My pleasure is heightened by the fact that I have known Professors Francis Yu and Suganda Jutamulia personally for a number of years. Besides having frequent correspondence with them, I have met them in various international conferences and enjoyed their company and the discussions I had with them. Professor Yu, of course, is internationally renowned as an author of numerous books on various aspects of optics, particularly on what has come to be known as ‘Information Optics’. Prof. Jutamulia has collaborated with him in writing and editing some of the books as also special issues of journals. On a personal note, my group’s work on information optics was largely influenced by Prof. Yu and collaborators’ researches.

The guest editorial has given background of the year 2015 being designated by UNESCO as the “International Year of Light and Light-based Technologies”. This is a recognition of the fact that optics is contributing in a big way to various facets of our lives. Considerable research investments are being made by various nations not only for augmenting research work but also for wealth creation. It is vital that more and more awareness be created about the role that light plays in communications, astronomy, life sciences, health, agriculture, energy, environment, and manufacturing among a host of other areas. Very rapid advances are being witnessed in nanophotonics ( metamaterials, plasmonics), adaptive optics, optical coherence tomography, adaptive optics, diffractive optics, digital holography, holographic displays, computational imaging, detectors, optical cryptography, space optics, microscopy, and optical materials to name a few areas.

Numerous events are being organized around the world. A number of professional societies are playing a leading role in this direction. Some of these are: SPIE, OSA, APS, AIP, and EPS. Many of the Nobel prize winners have volunteered to participate in lecture and discussion sessions. An international exhibition program named “LIGHT: Beyond the Bulb” has been launched so that a wider cross-section of the audience can be engaged. Numerous posts and blogs have been written and continue to be written. Light-based technologies are expected to revolutionize the 21st century as electronics did in the 20^th century. Optical technologies also give new thrust- from art to archaeology, cultural heritage, nature, art, and origin of life. We have all experienced the mood lifting effect of a walk in the sun which means that the sunshine helps fight the blues. Supermarket barcode scanners, CD players, computer printers, LCD screens, and tiny lenses in our mobile cameras, are some of the examples which we see and frequently use in our daily lives.

Professor Vinod Rastogi deserves our congratulations on bringing out the special issue and making Professors Yu and Jutamulia agree to spare their valuable time for guest editing such a readable issue. It is indeed remarkable that, a number of special issues of Asian J.Phys. on optics were published in 2014 and some more are slated to be published in 2015. This initiative of Prof. Rastogi is indeed praise-worthy and is a notable contribution to the events being organized in the “International Year of Light”. May the Almighty give Prof. Rastogi a long and healthy life so that he can march ahead with the activity which is he so passionate about.

Kehar Singh FNAE

Formerly Dean and Professor IIT Delhi

keharsiitd@gmail.com

Asian Journal of Physics Vol. 24, No 2 (2015) 205-215

On the Occasion of International Light Year

Light and Information

Francis T S Yu
Emeritus Evan Pugh Professor of Electrical Engineering
Penn State University

University Park, PA 16802, USA

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Light is not just the major source of energy that supports life and it is also a very viable information carrier. In this article, we showed that there is an intimate relationship between information and light as a carrier. We discussed the Uncertainty Principle of Heisenberg as related to information, in which we showed that every bit of information (or quanta of light) is limited by an unit cell of information and it is associated with a cost of entropy. Examples are given within the limit and beyond the Uncertainty Principle. We have shown that time and frequency resolutions cannot be observed simultaneously and yet the imaging can also be obtained within the limit of Certainty! ©Anita Publications. All rights reserved

Total Refs : 10

Asian Journal of Physics Vol. 24, No 2 (2015) 217-223

Time, Space, Information and life

Francis T S Yu

Emeritus Evan Pugh Professor of Electrical Engineering

Penn State University

University Park, PA 16802, USA

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One of the most intriguing aspects of life must be the concept of time! In other words, if there is no time, then there would be no life! Life may be known as; if there is a beginning, then there is an end! In a broader sense; life can be repeated again and again until it is totally disappeared, such as human race. But each human life is actually a different life! © Anita Publications. All rights reserved.

Total Refs : 9

Asian Journal of Physics Vol. 24, No 2 (2015) 225-230

Micro-prism test chip for surface plasmon resonance

Benny L Chan and Suganda Jutamulia*

EcoLife Technologies, LLC and

Department of Biomedical Engineering, University of Northern California

1300 Valley House Drive #100-7, Rohnert Park, CA 94928, USA

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A disposable micro-prism test chip for surface plasmon resonance measurement comprises a micro-tray having at least one through window and a micro-prism mounted on the micro-tray. The micro-tray also has a half-through cavity facing the micro-prism. The surface of the micro-prism in the through window is coated with a thin metal layer. The disposable micro-prism test chip is disposed after at least one use. The micro-prism is fabricated by pulling a heated preform, where the preform has the same cross-section as that of the pulled micro-prism. © Anita Publications. All rights reserved.

Keywords: Surface plasmon resonance, SPR, disposable micro-prism test chip, pulled micro-prism, glass preform, micro-tray, thin metal layer, silicon wafer

Total Refs : 5

Asian Journal of Physics Vol. 24, No 2 (2015) 231-236

One-lens fluorescence microscope using CMOS image sensor

Hasan Gadjali and Suganda Jutamulia^*

Department of Biomedical Engineering

University of Northern California, 1300 Valley House Drive #100-7, Rohnert Park, CA 94928, USA

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A fluorescence imaging module includes a fluorescence sample, a lens, an emission filter, an image sensor, and an illuminating device disposed between the sample and the lens. The illuminating device comprises a truncated pyramid for bending light emitted by the excitation light source toward the central area of the fluorescence sample. Light from the excitation light source enters from a slanted side surface of the truncated pyramid and emerges at the top of the truncated pyramid to illuminate the sample. The fluorescence image of the sample is formed by the lens through the emission filter on the image sensor. © Anita Publications. All rights reserved.

Keywords: One-lens fluorescence microscope, compact fluorescence microscope, fluorescence microscope module, CMOS image sensor, truncated pyramid illuminating device.

Total Refs : 6

Asian Journal of Physics Vol. 24, No 2 (2015) 237-242

Laser Module for Acupuncture

Fidelis Zaini Jutamulia

Private Practice, Jalan Gumilang No. 4, Bogor, 16143, Indonesia

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A laser module including a modified laser diode is proposed for acupuncture. The modified laser diode has a collimating lens in the can of its package, so a collimated laser light is emitted from the modified laser diode. The collimated laser light may be used as acupuncture needle replacement. © Anita Publications. All rights reserved.

Keywords: Laser module, laser diode, collimated laser light, orthogonal cylindrical lenses, pulled preform, acupuncture, needle replacement.

Total Refs : 6

Asian Journal of Physics Vol. 24, No 2 (2015) 243-248

Fringe projection techniques using endoscopes

Wei-Hung Su¹, Tzu-Chien Hsu¹, Cho-Yo Kuo¹, and Wei-Chia Su²

¹Department of Materials and Optoelectronic Science,

National Sun Yat-Sen University, Kaohsiung 804, Taiwan

²Graduate Institute of Photonics, National Changhua University of Education

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In this paper, a method using an endoscope to retrieve the surface profile of an inspected object is presented. A fringe pattern diffracted from a volume hologram is projected onto the inspected surface. The endoscope observes the projected fringes from another viewpoint. Fringes on the obtained image are deformed by the surface profile, and consequently are analyzable to retrieve the 3D shape. The size of the hologram is so compact that using an endoscope to retrieve the surface profile inside a body cavity is desirable. © Anita Publications. All rights reserved.

Keywords: fringe projection, fringe analysis, projected fringe profilometry, holography, optical inspection

Total Refs : 9

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Asian Journal of Physics Vol. 24, No 2 (2015) 249-252

Note on the use of interference terms of Wigner distribution function for specklegram analysis

Joewono Widjaja

Institute of Science, Suranaree University of Technology

Nakhon Ratchasima 30000, Thailand

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Interference term produced by Wigner distribution function is proved to be useful for specklegram analysis. Displacement information of specklegrams can be numerically extracted by low pass filtering the unwanted interference terms of the Wigner distribution output. This study is verified through computer simulations. © Anita Publications. All rights reserved.

Total Refs : 11

Asian Journal of Physics Vol. 24, No 2 (2015) 253-267

Influence of space-time speckle effect on image in synthetic aperture imaging ladar

Qian Xu, Liren Liu,* Jianfeng Sun, Zhu Luan, Peipei Hou, Mei Yang and Lijuan Wang

¹Key Laboratory of Space Laser Communication and Testing Technology,

Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, No. 390,

Qinghe Road, Jiading District, Shanghai 201800, China

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In synthetic aperture imaging ladar (SAIL), the space-time varying speckle effect markedly degrades image quality. In this paper, the space-time varying speckle effect and its influence on imaging resolution in a SAIL are analyzed. Results show that during the two-dimensional data acquisition speckle pattern in the scope of the optical receiving antenna shifts an average scale in both range and azimuth directions. Additional window functions are also imported to the imaging resolution, thereby affecting the intensity and scale of imaging resolution. Our results may be valuable for further studies on the suppression of speckle effect in SAILs. © Anita Publications. All rights reserved.

OCIS codes: (030.6140) Speckle; (280.6730) Synthetic aperture radar; (330.6130) Spatial resolution; (280.3640) Lidar http://dx.doi/org/10.1364/AO.99.099999.

Total Refs : 11

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Asian Journal of Physics Vol. 24, No 2 (2015) 269-274

Despeckle methods and their new application to laser LCOS projector

Suganda Jutamulia

University of Northern California

Biomedical Engineering Department

1300 Valley House Drive, #100-7, Rohnert Park, CA 94928

___________________________________________________________________________________________________________________________________

Early despeckle methods are revisited. In earlier problem, speckles are caused by the diffused holographic object, and in current problem, speckles are caused by the diffused projection screen. © Anita Publications. All rights reserved.

Keywords: Despeckle; hologram; laser projector; LCOS

Total Refs : 7

Asian Journal of Physics Vol. 24, No 2 (2015) 275-282

Rh-doped Bi₁₂TiO₂₀ photorefractive crystals and their applications
for near infrared sensitive light valve devices

Vera Marinova^1,2*, Ren Chung Liu¹, Shiuan Huei Lin³,Yi Hsin Lin¹ and Ken Yuh Hsu¹

¹Department of Photonics, National Chiao Tung University, University Str., 1001, Hsinchu 30010, Taiwan

²Institute of Optical Materials and Technologies, Acad, G. Bonchev Str. 109, Sofia, Bulgaria

³Department of Electrophysics, National Chiao Tung University, University Str., 1001, Hsinchu 30010, Taiwan

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We review the effect of Rh-doping on optical and holographic properties of Bi₁₂TiO₂₀ (BTO)crystal and its combination with liquid crystal (LC) into an optically addressed liquid crystal light valve (LCLV) device. Real-time holographic recording has been performed in Rh-doped BTO at 1064 nm with detected significant improvement of the sensitivity and the response time. Furthermore, by using 532 nm light for pre-excitation, an operation speed of 20 ms is achieved at 1064nm. Phase modulation characteristics of the proposed BTO:Rh/LCLV device are demonstrated, supporting further possibilities for near infrared nonlinear applications. © Anita Publications. All rights reserved.

Total Refs : 24

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Asian Journal of Physics Vol. 24, No 2 (2015) 283-294

Simulation of volume holographic storage system with VOHIL model

Chih-Yuan Cheng, Yeh-Wei Yu, Zhong-Mou Hsu, and Ching-Cherng Sun*

Department of Optics and Photonics, NationalCentralUniversity, Chung-Li 320, Taiwan

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The simple paraxial formulas for calculating point spread function (PSF), shifting selectivity and pixel migration of holographic storage system are presented. These formulas show that both amplitude and phase modulation make no obvious improvement in shifting selectivity, but PSF is obvious improved by phase modulation. It can be designed properly for not harming the shifting selectivity too much. A simplified formula shows a clear physical concept that the shifting selectivity is just the square of Fourier transform of the intensity distribution of reference pattern and does not depend on the thickness of the disc. Another formula shows that disc rotation or shift usually causes pixel migration, and thus the signal quality is decreased. Using paraxial approximation analysis, an optimal geometrical distance ratio, K, is calculated to compensate for pixel migration and improves image quality during disc rotation or shift. The result of approximation is confirmed by the simulation. © Anita Publications. All rights reserved.

Total Refs : 25

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Asian Journal of Physics Vol. 24, No 2 (2015) 295-299

Reduction of sidelobe energy by shifts in training images for the Mach-Zehnder joint transform correlator

Chewei Chen and Chulung Chen

Department of Photonics Engineering, Yuan Ze University, Taoyuan 32003, Taiwan

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Correlation reference function has been designed in our previous research for the non-zero order joint transform correlator. In order to yield the reference function, training images were put at the presumed center. However, it could not guarantee that the average cross correlation energy is smallest. To improve this, in this paper, training images are shifted for optical pattern recognition with a Mach-Zehnder interferometer. Numerical result shows that this technique can be implemented at the input plane of liquid crystal spatial light modulator. In particular, each liquid crystal spatial light modulator in reflective mode is modulated along the real-valued axis. © Anita Publications. All rights reserved.

Keywords: Joint transform correlator; Mach-Zehnder interferometer

Total Refs : 15

Asian Journal of Physics Vol. 24, No 2 (2015) 301-308

A hybrid method to improve the accuracy of multichannel volume holographic correlators

Liangcai Cao, Qingsheng He, and Guofan Jin

Department of Precision Instrument,

State Key Laboratory of Precision Measure Technology and Instruments,

Tsinghua University, Beijing 100084

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Due to large database storage capacity and high speed multi-channel parallel correlation, volume holographic optical correlator (HOC) is a promising candidate for on-board real-time pattern recognition. The optical calculation accuracy is the bottleneck of this technology for practical applications. A hybrid method combined of standardizing and inter leaving images is proposed to improve the output accuracy of volume holographic correlators. The method equalizes the filling ratios of ON to ALL pixels in the processed images and redistributes the pixels inside images without changing the inner products. It can eliminate the impact of the correlation pattern difference on the accuracy of inner product calculation. Experimental tests shows that this method could acquire better calculation value. © Anita Publications. All rights reserved.

Total Refs : 10

Asian Journal of Physics Vol. 24, No 2 (2015) 309-314

Multi-port broadband adaptive RF power splitter employing an Opto-VLSI Processor

Haithem A B Mustafa¹, Feng Xiao¹,Kamal Alameh¹ and Feijun Song²

¹Electron Science Research Institute, Edith Cowan University, Australia

²China Daheng Optics Division, China Daheng Group, Beijing, China

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A novel multi-port broadband adaptive RF (Radio Frequency) power splitter structure is proposed and experimentally demonstrated. The multi-port broadband RF adaptive power splitter structure employs an Opto-VLSI processor for optical beam multicasting in conjunction with an optical fiber array, a photo-detector array, and an array of 4-f imaging lens system for splitting a broadband RF signal into multiple output RF ports with user-defined splitting ratios. A proof of concept 1×8 broadband adaptive RF power splitter structure, driven by optimized multicasting phase holograms uploaded onto the Opto-VLSI processor, is developed, demonstrating the ability to arbitrarily split an RF signal to various output port with variable power splitting ratios over a wide frequency range. © Anita Publications. All rights reserved.

Keywords: Opto-VLSI processing, RF splitting, microwave photonics

Total Refs : 21

Asian Journal of Physics Vol. 24, No 2 (2015) 315-324

Analysis and experiment of Opto-DMD based multi-channel tunable fiber laser

Binbin Yan¹, Tao Wang¹, Xiao Chen², Feijun song³, Feng Xiao⁴, Kamal Alameh⁴, Gang-Ding Peng⁵

¹State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China

²College of Science, Minzu University of China, Beijing 100081, China

³China Daheng Group, Inc., #A9 ShangdiXinxi Avenue, Haidian District, Beijing 100085, China

⁴Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia

⁵Photonics & Optical Communications, University of New South Wales, Sydney 2052, NSW, Australia

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We use a digital micromirror device (DMD) as wavelength selector in tunable fiber lasers because it has advantages in high resolution, fast switching speed, high diffraction efficiency etc. In this paper, for reducing the diffraction loss and improving the system stability, we analyze the dependence of diffractive properties of the Opto-DMD grating on the incident angle and pixel size in detail, and give its effect on properties of fiber laser parameters. The theoretical results are agreement with the experiments very well. By using an Opto-DMD and erbium-doped fiber amplifiers (EDFA), we experimentally demonstrate a high stable single-polarization multi-channel wavelength-tunable fiber laser and a single-longitudinal-mode multi-channel wavelength-tunable fiber laser with good performance, respectively. © Anita Publications. All rights reserved.

Total Refs : 9

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Asian Journal of Physics Vol. 24, No 2 (2015) 325-334

Understanding photonic crystal from interference filter

Feijun Song¹ and Suganda Jutamulia²

¹China Daheng Group, Inc., #A9 ShangdiXinxi Avenue, Haidian District, Beijing 100085, China

²Department of Biomedical Engineering, University of
Northern California 1300 Valley House Drive #100-7, Rohnert Park, CA 94928, USA

___________________________________________________________________________________________________________________________________

Total Refs : 11

Asian Journal of Physics Vol. 24, No 2 (2015) 335-344

Optical processing for radar imaging and broadband signal

Francis T S Yu

Emeritus Evan Pugh Professor of electrical Engineering Penn State University

University Park, PA 16802, USA

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One of the interesting applications in optical processing must be the synthetic aperture radar imaging. It was the first time that a naked human eye can actually see the radar image with optics. By exploiting the optical two-dimensional spatial processing capability, we will show that a very large space bandwidth signal can be process by means of conventional optical information processor. © Anita Publications. All rights reserved.

Total Refs : 5

ASIAN JOURNAL OF PHYSICS