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Dive into the research topics where Ci-Ling Pan is active.

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Featured researches published by Ci-Ling Pan.


Nature Nanotechnology | 2007

Improved broadband and quasi-omnidirectional anti-reflection properties with biomimetic silicon nanostructures

Yi-Fan Huang; Surojit Chattopadhyay; Yi-Jun Jen; Cheng-Yu Peng; Tze-An Liu; Yu-Kuei Hsu; Ci-Ling Pan; Hung-Chun Lo; Chih-Hsun Hsu; Y. H. Chang; Chih-Shan Lee; Kuei-Hsien Chen; Li-Chyong Chen

Nature routinely produces nanostructured surfaces with useful properties, such as the self-cleaning lotus leaf, the colour of the butterfly wing, the photoreceptor in brittlestar and the anti-reflection observed in the moth eye. Scientists and engineers have been able to mimic some of these natural structures in the laboratory and in real-world applications. Here, we report a simple aperiodic array of silicon nanotips on a 6-inch wafer with a sub-wavelength structure that can suppress the reflection of light at a range of wavelengths from the ultraviolet, through the visible part of the spectrum, to the terahertz region. Reflection is suppressed for a wide range of angles of incidence and for both s- and p-polarized light. The antireflection properties of the silicon result from changes in the refractive index caused by variations in the height of the silicon nanotips, and can be simulated with models that have been used to explain the low reflection from moth eyes. The improved anti-reflection properties of the surfaces could have applications in renewable energy and electro-optical devices for the military.


Applied Physics Letters | 2006

Liquid-crystal-based terahertz tunable Lyot filter

Chao-Yuan Chen; Ci-Ling Pan; Cho-Fan Hsieh; Yea-Feng Lin; Ru-Pin Pan

A tunable Lyot filter operating in the terahertz frequency range is demonstrated by using fixed and variable nematic liquid crystals.


Applied Physics Letters | 2008

Terahertz air-core microstructure fiber

Ja-Yu Lu; Chin-ping Yu; Hung Chung Chang; Hung Wen Chen; Yu Tai Li; Ci-Ling Pan; Chi-Kuang Sun

A low-loss terahertz air-core microstructure fiber is demonstrated for terahertz waveguiding. Substantially low attenuation constant less than 0.01cm−1 has been achieved and the guiding wavelength is found to be tunable by linear scaling the fiber size. The experimental results well agree with the simulation based on the finite-difference frequency-domain method, which interprets the guiding mechanism as the antiresonant reflecting waveguiding. The simulated modal pattern shows that most terahertz field is concentrated inside the central hollow air core and is guided without outside interference, which has high potential for guiding intense terahertz waves with minimized loss.


Optics Express | 2008

WDM extended reach passive optical networks using OFDM-QAM

Chi-Wai Chow; Chien-Hung Yeh; Chia-Hsuan Wang; F. Y. Shih; Ci-Ling Pan; Sien Chi

In order to reduce the cost for delivering future broadband services, network operators are inclined to simplify the network architectures by integrating the metro and access networks into a single system. Hence, extended reach passive optical networks (ER-PONs) have been proposed. ER-PON usually has four new features: high data rate in both upstream and downstream signals (>1 Gb/s); reach extension to >100 km; a high split ratio (>100); and using wavelength division multiplexing (WDM). In this work, we propose and demonstrate a highly spectral efficient ER-PON using 4 Gb/s OFDM-QAM for both upstream and downstream signals, while achieving a high split-ratio of 256. The ER-PON employs optical components optimized for GPON (bandwidth of approximately 1 GHz) and reaches 100 km without dispersion compensation. Numerical analysis using 16, 64 and 256-QAM OFDM are also performed to study the back-to-back receiver sensitivities and power penalties at different electrical driving ratios.


Optics Letters | 2006

Voltage-controlled liquid-crystal terahertz phase shifter and quarter-wave plate

Cho-Fan Hsieh; Ru-Pin Pan; Tsung-Ta Tang; Hung-Lung Chen; Ci-Ling Pan

Phase shift exceeding tau/2 at 1 THz is demonstrated by using electrically controlled birefringence in a homeotropically aligned nematic liquid crystal (E7) cell, 570 microm in thickness. The driving voltage required for a phase shift of 90 degrees is 125 V (rms). We demonstrate that the phase shifter works as an electrically switchable quarter-wave plate at 1 THz. The device can also be used as an electrically tuned phase compensator around the quarter-wave point near 1 THz.


Optics Express | 2004

Magnetically tunable room-temperature 2 pi liquid crystal terahertz phase shifter.

Chao-Yuan Chen; Cho-Fan Hsieh; Yea-Feng Lin; Ru-Pin Pan; Ci-Ling Pan

Tunable phase shift up to 360 degrees at 1 THz is achieved with a liquid crystal (LC) device. The key to this design is (1) the use of a nematic LC, E7, which exhibits a birefringence of ~ 0.17 (0.2 - 1.2 THz); (2) a LC cell (3-mm in thickness) with sandwiched structure to increase the interaction length while minimizing interface Fresnel losses; and (3) the use of magnetic field to align the thick LC cell and achieve continuous tuning of phase from 0 to 360 degrees . This device can be operated over a broad range near room temperature.


Optics Express | 2005

Control of enhanced THz transmission through metallic hole arrays using nematic liquid crystal

Ci-Ling Pan; Cho-Fan Hsieh; Ru-Pin Pan; Masaki Tanaka; Fumiaki Miyamaru; Masahiko Tani; Masanori Hangyo

We demonstrate frequency tuning of enhanced THz radiation transmitted through a two-dimensional metallic hole array (2D-MHA) by controlling the index of refraction of the medium filling the holes and adjacent to the 2D-MHA on one side. The medium is a nematic liquid crystal (NLC) and its index of refraction is varied using magnetically controlled birefringence of the NLC. With the NLC, the peak transmission frequency of the 2D-MHA shift to the red by 0.112 THz and can be tuned from 0.193 to 0.188 THz. The peak transmittance is as high as 70% or an enhancement of 2.42 times, considering the porosity of the 2D-MHA. As a tunable THz filter, this device exhibits a continuous tuning range of 4.7 GHz , a low insertion loss of 2.35 to 1.55 dB and a quality factor of ~ 4-5.


Applied Physics Letters | 2003

Room temperature terahertz phase shifter based on magnetically controlled birefringence in liquid crystals

Chao-Yuan Chen; Tsong-Ru Tsai; Ci-Ling Pan; Ru-Pin Pan

We present the use of magnetically controlled birefringence in a nematic liquid crystal cell for phase shifting of electromagnetic waves in the range of terahertz frequencies. This device can be operated at room temperature. A maximum phase shift of 141° has been demonstrated at 1.025 THz and the results are in good agreement with theoretical predictions.


Applied Physics Letters | 2004

Near-infrared femtosecond laser-induced crystallization of amorphous silicon

Jia-Min Shieh; Zun-Hao Chen; Bau-Tong Dai; Yi-Chao Wang; Alexei K. Zaitsev; Ci-Ling Pan

Amorphous silicon (a-Si) was crystallized by femtosecond laser annealing (FLA) using a near-infrared (λ≈800nm) ultrafast Ti:sapphire laser system. The intense ultrashort laser pulses lead to efficient nonlinear photoenergy absorption and the generation of very dense photoexcited plasma in irradiated materials, enabling nonlinear melting on transparent silicon materials. We studied the structural characteristics of recrystallized films and found that FLA assisted by spatial scanning of laser strip spot constitutes superlateral epitaxy that can crystallize a-Si films with largest grains of ∼800nm, requiring laser fluence as low as ∼45mJ∕cm2, and low laser shots. Moreover, the optimal annealing conditions are observed with a significant laser-fluence window (∼30%).


Optics Letters | 1995

TUNABLE MULTITERAHERTZ BEAT SIGNAL GENERATION FROM A TWO-WAVELENGTH LASER-DIODE ARRAY

Chi-Luen Wang; Ci-Ling Pan

We report, for the first time to our knowledge, generation of a tunable miltiterahertz modulation signal on an optical carrier directly from a single laser source. The modulation frequency, which can be tuned from 0.15 THz to more than 7 THz, is the beat note obtained by varying the spectral separation between the coaxial two-color output of a two-wavelength laser-diode array from 0.32 to 17 nm. The frequency characteristics of the terahertz beat note are determined with a noncollinear intensity autocorrelator.

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Dive into the Ci-Ling Pan's collaboration.

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Ru-Pin Pan

National Chiao Tung University

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Jia-Min Shieh

National Chiao Tung University

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Gong-Ru Lin

National Taiwan University

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Jin-Wei Shi

National Central University

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Tze-An Liu

Industrial Technology Research Institute

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Chao-Kuei Lee

National Sun Yat-sen University

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Chan-Shan Yang

National Tsing Hua University

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Chi-Wai Chow

National Chiao Tung University

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Alexey Zaytsev

National Tsing Hua University

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Cho-Fan Hsieh

National Chiao Tung University

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