C. C. Yang

University of Science and Technology of China

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i-10 index

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Co-Authors

Yean‐Woei Kiang

National Taiwan University

185

Yang Kuo

National Taiwan University

Meng‐Tsan Tsai

Chang Gung University

Yen-Cheng Lu

Feng Chia University

Cheng‐Yen Chen

National Yang Ming Chiao Tung University

Chieh Hsieh

National Taiwan University

Horng-Shyang Chen

National Taiwan University

Chi‐Feng Huang

Institute of Physics, Academia Sinica

Che‐Hao Liao

King Abdullah University of Science and Technology

Charng-Gan Tu

National Taiwan University

Cooperative Institutions

National Taiwan University

592

National Yang Ming Chiao Tung University

121

National Tsing Hua University

108

National Cheng Kung University

National Applied Research Laboratories

National Taiwan University of Science and Technology

National Central University

Industrial Technology Research Institute

Chinese Academy of Sciences

Chang Gung University

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Dependencies of the emission behavior and quantum well structure of a regularly-patterned, InGaN/GaN quantum-well nanorod array on growth condition

Optics Express (2014)

Che‐Hao Liao Charng-Gan Tu Wen-Ming Chang Chia-Ying Su Pei-Ying Shih

To achieve green emission from the sidewall non-polar quantum wells (QWs) of a GaN nanorod (NR) light-emitting diode, regularly patterned InGaN/GaN QW NR arrays are grown under various growth conditions of indium supply rate, QW growth temperature, and QW growth time for comparing their emission wavelength variations of the top-face c-plane and sidewall m-plane QWs based on photoluminescence and cathodoluminescence (CL) measurements. Although the variation trends of QW emission wavelength by changing those growth conditions in the NR structure are similar to those in the planar structure, the emission wavelength range of the QWs on an NR is significantly shorter than that in a planar structure under the same growth conditions. Under the growth conditions for a longer NR QW emission wavelength, the difference of emission wavelength between the top-face and sidewall QWs is smaller. Also, the variation range of the emission wavelength from the sidewall QWs over different heights on the sidewall becomes larger. On the other hand, strain state analysis based on transmission electron microscopy is undertaken to calibrate the average QW widths and average indium contents in the two groups of QW of an NR. The variation trends of the calibrated QW widths and indium contents are consistent with those of the CL emission wavelengths from various portions of NR QWs.

Cathodoluminescence

Nanorod

10.1364/oe.22.017303

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Citations (18)

On the coexistence of particle and turbulence scattering

The Journal of the Acoustical Society of America (1986)

C. C. Yang

A theory is presented to take care of a mixed system in which scattering effects from small particles and turbulences coexist. In this theory, a correlation function for irregularities is successfully derived such that it covers the variations due to sharp boundaries between particles and the surrounding medium, particle distributions, and volume concentration fluctuations. Hence, the theory of turbulence scattering becomes applicable to this mixed system when the Rayleigh approximation is valid. Numerical results are compared with experimental data from other research groups. Also, the coupling effect of, and the dominance between, these two kinds of scattering are discussed.

Particle (ecology)

10.1121/1.394405

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Citations (3)

Bio-Plasmonics: Nano/micro Structure of Surface Plasmon Resonance Devices for Biomedicine

Optical and Quantum Electronics (2005)

Chii‐Wann Lin Kuo‐Ping Chen Ming-Chii Su Chih‐Kung Lee C. C. Yang

Biomolecule

Admittance

Oscillation (cell signaling)

Nanophotonics

Localized surface plasmon

10.1007/s11082-005-4222-5

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Citations (31)

Mesa-size-dependent color contrast in flip-chip blue/green two-color InGaN∕GaN multi-quantum-well micro-light-emitting diodes

Applied Physics Letters (2006)

Horng-Shyang Chen Dong-Ming Yeh Chih-Feng Lu Chi‐Feng Huang Yen-Cheng Lu

The authors fabricate blue/green two-wavelength, InGaN∕GaN quantum-well (QW), flip-chip micro-light-emitting diodes (μ-LEDs) of different mesa sizes by stacking QWs of different indium contents. It is found that the blue/green contrast ratio of such a μ-LED increases with the mesa size. The relatively stronger blue intensity in a device of a larger mesa area is due to its higher operation junction temperature such that hole migration can be enhanced through thermally exciting holes to escape from the QW (green emitting) closest to the p-type layer and to be captured by the neighboring QWs (blue emitting). The higher junction temperature in such a μ-LED of a larger mesa area is due to its smaller ratio of the sidewall surface area over the active volume, leading to the less effective sidewall heat radiation and light extraction.

Green-light

Indium gallium nitride

10.1063/1.2339034

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Citations (16)

Landmine detection and classification through hybrid neural networks and fuzzy set

Nirmal K. Bose C. C. Yang

Unlike conventional weapons, the buried landmine, if not removed, remains a threat. The clearance of anti-personnel landmine has become an important issue in military, economic, and especially humanitarian concerns worldwide. Traditionally, the landmine clearance is conducted by human expert or animal. With the advance of technology, various detection and classification strategies and sensors have been proposed to provide better solutions. The research conducted in the areas of landmine detection is voluminous. This work seeks to focus on improving the detection and classification of landmine by applying neural networks and fuzzy set theory. The phase information in scattering parameters dataset measured by separated aperture sensor and ignored in previous research is shown to be valuable with proper selection of neural network model capable of handling complex-valued data. By using the complex-operator and complex chain rule, a simplified derivation of the back-propagation learning method is constructed. A two-stage hybrid neural network architecture, combining a complex-valued feedforward neural network and a self-organizing feature map, is proposed to classify the types of landmine by integrating fuzzy information at pixel level. From the proposed architecture, a new technique using self-organizing feature map to elicit fuzzy membership function for classification from data with labelling information is discovered.

Feedforward neural network

Feature (linguistics)

Source

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Inserting colloidal quantum dots into GaN Mesa-array subsurface porous structures through electrochemical etching for display color conversion application

Nanotechnology (2024)

Shaobo Yang Chun-Jui Chu Zong-Han Li Wei‐Cheng Chen Hsi-Yu Feng

Abstract High-efficiency photon color conversion is an approach of great potential for implementing color display. Inspired by the observation of emission enhancement in a nanoscale cavity, a novel technique to fabricate an array of color converter by mixing colloidal quantum dots (QDs) with the electrolyte of an electrochemical etching (ECE) process is demonstrated. In this process, QDs flow with the electrolyte into the etched subsurface nanoscale porous structure (PS) and settle inside. Since the PS formation and hence QD insertion are controlled by the flow path of the applied electric current in the ECE process, this technique can be used for fabricating any graphic pattern. The nanostructure of such a QD-inserted mesa is examined to confirm QD insertion. Although only single-color mesa arrays are demonstrated in this paper, this technique can be used for fabricating a multiple-color mesa array if a QD or a light-emitting nanoparticle of higher thermal stability is available.

10.1088/1361-6528/ad7962

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Light-emitting devices fabricated with CdSe nano-crystals coated on an InGaN/GaN quantum-well structure for polychromatic generation

Dong-Ming Yeh Chih‐Feng Lu Chi-Feng Huang Tsung-Yi Tang Horng-Shyang Chen

By coating CdSe nano-crystals on an InGaN/GaN quantum well structure, polychromatic LEDs emitting blue and red lights have been implemented. The blue photons emitted by the quantum well structure are absorbed by the CdSe nano-crystals for emitting red light. By fabricating holes on the quantum well structure for filling up the nano-crystal solution, the red emission efficiency can be improved.

Wide-bandgap semiconductor

Quantum Efficiency

Crystal (programming language)

10.1109/leos.2005.1547976

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Raman compensation for loss in a multichannel soliton-based optical fiber communication system

Optical Fiber Communication Conference (1989)

L. K. Wang C. C. Yang

Soliton transmission has been proposed for achieving a high-bit-rate long-distance optical fiber communication system.1 In the absence of fiber loss, distortionless pulses can be propagated along the fiber due to the balance between the frequency dispersion and self-phase modulation. However, in practical situations the pulse intensity decays because of fiber loss, resulting in a weaker self-phase modulation and hence the destruction of soliton. To solve this problem, loss compensation techniques using stimulated Raman scattering have been Introduced recently.2,3 In such a technique, cw pump waves are injected periodically into the fiber so that the signal pulses are amplified through the stimulated Raman scattering. It has been found that stable transmission of solitons over a long distance can be obtained using this amplification scheme. Nevertheless, the technique proposed so far is mainly focused on the soliton reconstruction for single-channel communication systems. An amplification scheme for multichannel systems is practically needed.

Raman amplification

Modulation (music)

SIGNAL (programming language)

10.1364/ofc.1989.wq10

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<title>Optical anisotropy characteristics of skeletal muscle tissues</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2002)

Chia‐Wei Sun C. C. Yang Yean‐Woei Kiang

To explore the polarization-dependent optical properties of skeletal muscle tissues, we calibrated the extinction coefficients of the polarization components parallel with and perpendicular to chicken breast tissue filaments and the cross-polarized intensity coupling coefficients between the two polarization components, based on the measured quasi- coherent photons. The calibrated values of these coefficients were quite consistent with previously reported. The extinction coefficient in the polarization along tissue filaments was significantly higher than that of the other polarization. Also, the cross-polarized coupling coefficient of the coupling from the polarization of tissue filaments into the other was stronger than that of inverse coupling.

Molar absorptivity

Extinction ratio

10.1117/12.472523

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A single-phase full-bridge soft-switching inverter circuit with an auxiliary resonant circuit

Journal of Physics Conference Series (2023)

C. C. Yang Tao Zeng Chia-Wei Huang W T Hsu

Abstract A new topological structure is proposed in this article for the traditional single-phase full-bridge inverter circuit by adding an auxiliary synchronizing resonant circuit. Without extra switching transistors, the complexity of the control circuit is simplified while enabling zero voltage switching (ZVS) functionality. The significance of this proposed topology is that the switching transistors of all bridge arms are sharing one common synchronizing unit which is constructed with an absorbing inductor and capacitor. In this way, the added-on components can be substantially reduced for the main switching transistor circuit. By utilizing a big-volume capacitor as the constant voltage source, the sourceless energy feedback unit can minimize the switching losses. In the meantime, the proportional-resonant feedback circuit can modify the sinusoidal pulse width modulation (SPWM) duty ratio to stabilize the output current. In the PSIM power electronic simulation software environment, the operation of the soft-switching inverter circuit is analyzed to demonstrate our proposed topology can reduce the on-off switching losses as expected for the switching transistors of the soft-switching inverter circuit.

Resonant inverter

Synchronizing

Duty cycle

Snubber

10.1088/1742-6596/2631/1/012010

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