Browsing by Author "Chang, Yuhsin"

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An ultra-broadband nano-plasmonic reflector with an asymmetric nano-ring resonator
(2014-01-01)
Chang, Yuhsin
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Chen, Chyong-Hua
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光電工程學系
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Department of Photonics
We propose a broadband nano-plasmonic reflector by using an asymmetric nano-ring resonator directly connected to the input and output waveguides based on metal-insulator-metal waveguides. Due to direct connection, both clockwise and counterclockwise traveling modes propagate inside the ring resonator, giving rise to resonator resonances and Mach Zehnder interference. Ultra-broad bandwidth is realized by adjusting the lengths of the ring to manipulate the resonant wavelengths and varying its widths to minimize the low-transmission ripples. An example of the plasmonic reflector with the dimensions of 200x522 nmxnm and the bandwidth of 1000 nm is numerically accomplished
Broadband Plasmonic Bandstop Filters With a Single Rectangular Ring Resonator
(2014-10-01)
Chang, Yuhsin
;
Chen, Chyong-Hua
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交大名義發表
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光電工程學系
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National Chiao Tung University
A broadband plasmonic bandstop filter with a single directly connected rectangular ring resonator is proposed. Inside this resonator, which is constructed using two nonidentical branches, both ring resonance and Mach-Zehnder interference occurred. A broad stopband can be realized by appropriately adjusting the resonant wavelengths of these two interferences. An equivalent circuit model is established to analytically describe the performance of this structure and to systematically target its design parameters to achieve the minimal transmittance in the stopband. An example of the plasmonic bandstop filter with its dimensions of 200 nm x 522 nm and stopband edge wavelengths of 1300 and 1800 nm is numerically demonstrated.
Design of a Broadband Plasmonic Unequal-Power Splitter with a Rectangular Ring Resonator
(2015-06-01)
Chang, Yuhsin
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Chen, Chyong-Hua
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光電工程學系
;
Department of Photonics
We proposed a novel method to design a broadband plasmonic unequal-power splitter with a rectangular ring resonator directly connected to the input and output waveguides. By properly assigning the locations of the input and output waveguides, the splitting ratio is controlled by manipulating the output waveguide widths while the reflectance is eliminated by adjusting the input waveguide width without varying any other design parameters. To obtain the design parameters of the input and output waveguide widths, analytical expressions of the splitting ratio and the reflectance are established by using the equivalent circuit based on the transmission line model. Design examples of unequal-power splitters with splitting ratio of 0.5 are numerically demonstrated. The analysis based on equivalent circuit is well confirmed by the finite difference time domain simulation. The simulated results show that the unequal-power splitters have a flat and wide band over the wavelength range from 1500 nm to 1600 nm by using a compact rectangular ring resonator with the dimensions of 550 nm x 275 nm.
Effective algorithm for high-channel-count multichannel fiber Bragg grating designs
(2012-09-01)
Chang, Yuhsin
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Chen, Chyong-Hua
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光電工程學系
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Department of Photonics
We present an efficient approach to design a high-channel-count multichannel fiber Bragg grating by assigning optimal sets of delay coefficients and constant phases to the corresponding channel responses. Based on approximate Fourier transform, the delay coefficients are chosen to separate all the single-channel gratings into several groups spatially in the grating structure, and the constant phases in each group are optimized to minimize the maximum index modulation to be approximately the square root of the maximum of the number of the channels in all groups times larger than that of the one-channel grating. Design examples demonstrate that the proposed method has advantages of low index modulation, low algorithmic complexity, and suitability for multichannel fiber Bragg grating designs with either identical or nonidentical spectral responses. (c) 2012 Optical Society of America
Low-Cost High-Performance CMOS Terahertz Imaging System
(2015)
Li, Chung Hsing
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Yan, Tzu-Chao
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Chang, Yuhsin
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Chen, Chyong
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Kuo, Chien-Nan
CMOS technology has found its way in THz imaging applications. Utilizing the plasma wave theory, a MOSFET device can detect THz radiation beyond the cutoff frequency. Assisted by the system-on-packaging technique, a CMOS source delivers radiation power more effectively. An imaging system demonstrates that a low-cost CMOS solution is feasible.