Browsing by Author "Wang, Chun"

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Compressible 1D photonic crystal nanolasers with wide wavelength tuning
(2017-06-15)
Lu, Tsan-Wen
;
Wu, Chia-Cheng
;
Wang, Chun
;
Lee, Po-Tsung
;
資訊工程學系
We propose and demonstrate a tunable photonic crystal nanolaser consisting of 1D periodic nanorods wrapped in deformable polydimethylsiloxane. In addition to low-threshold and long-term lasing stability, the nanolaser also displays reproducible and reliable wavelength tuning with a large tunability of 7.7 nm under 1% compression. By further associating with stretching, a very wide wavelength-tunable range of 155 nm that almost spans the entire S + C + L telecommunication bands is successfully demonstrated with a single nanolaser device. (C) 2017 Optical Society of America
Effect of AlN Spacer on the AlGaN/GaN HEMT Device Performance at Millimeter-wave Frequencies
(2018-01-01)
Wang, Chun
;
Hsu, Heng-Tung
;
Huang, Ting-Jui
;
Fan, Jun-Kai
;
Chang, Edward Yi
The effect of the AlN spacer on the performance of AlGaN/GaN HEMT devices at 38 GHz is experimentally investigated. The measurement results revealed that the device with spacer showed superior performance in terms of the maximum drain current. RF wise, substantial improvement in the cut-off frequency and the maximum oscillation frequency was also observed for devices with spacer. A saturated output power density of 4.21 W/mm with 35.02% power-added efficiency (PAE) at 38 GHz were achieved for device with 70nm gate length.
Tunable 1D Photonic Crystal Nanolaser and its Capability of Stretching Sensing
(2016)
Lu, Tsan-Wen
;
Wang, Chun
;
Hsiao, Chi-Fan
;
Lee, Po-Tsung
;
光電工程學系
Tunable nanolasers via 1D nanoblocks embedded within polydimethylsiloxane are demonstrated, which show large wavelength tunability of 7.65nm per 1% stretching and high reliability under repeating stretching/ relaxing tests. Wide tuning range over 80nm is achieved. As a stretching sensor, minimum detectable stretching of 0.072% is obtained.