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  1. Article ; Online: Compact and broadband silicon polarization splitter-rotator using adiabaticity engineering.

    Hung, Yung-Jr / Chen, Chih-Hsien / Chung, Hung-Ching / Lai, Jun-Zhu / Tseng, Shuo-Yen

    Optics letters

    2024  Volume 49, Issue 7, Page(s) 1852–1855

    Abstract: We propose and demonstrate a short and broadband silicon mode-conversion polarization splitter-rotator (PSR) consisting of a mode-conversion taper and an adiabatic coupler-based mode sorter both optimized by adiabaticity engineering (AE). AE is used to ... ...

    Abstract We propose and demonstrate a short and broadband silicon mode-conversion polarization splitter-rotator (PSR) consisting of a mode-conversion taper and an adiabatic coupler-based mode sorter both optimized by adiabaticity engineering (AE). AE is used to optimize the distribution of adiabaticity parameter over the length of the PSR, providing shortcut to adiabaticity at a shorter device length. The total length of the PSR is 85 µm. The design is compatible with standard silicon photonics platforms and requires only one patterning step. Fabricated PSR has a polarization cross talk of less than -20 dB over the entire O-band for the TE polarization and a polarization cross talk of less than -15 dB from 1267 to 1348 nm for the TM polarization. Overall, the PSR shows low polarization cross talk (-15 dB) over a bandwidth of 81 nm in the O-band. Cross-wafer measurements show that the PSR has good fabrication tolerance.
    Language English
    Publishing date 2024-04-01
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.518607
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Compact polarization-independent quasi-adiabatic 2×2 3 dB coupler on silicon.

    Chung, Hung-Ching / Chen, Chih-Hsien / Hung, Yung-Jr / Tseng, Shuo-Yen

    Optics express

    2022  Volume 30, Issue 2, Page(s) 995–1002

    Abstract: We demonstrate a quasi-adiabatic polarization-independent 2×2 3 dB coupler based on the silicon-on-insulator platform. Using a quasi-adiabatic taper design for the mode evolution/coupling region, the TE mode evolution is accelerated, and the TM mode ... ...

    Abstract We demonstrate a quasi-adiabatic polarization-independent 2×2 3 dB coupler based on the silicon-on-insulator platform. Using a quasi-adiabatic taper design for the mode evolution/coupling region, the TE mode evolution is accelerated, and the TM mode coupling is achieved at a short coupling length. The measured working bandwidth is 75 nm with a compact mode evolution/coupling region of 11.7 μm.
    Language English
    Publishing date 2022-02-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.446492
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Robust silicon arbitrary ratio power splitters using shortcuts to adiabaticity.

    Chung, Hung-Ching / Wang, Tai-Chun / Hung, Yung-Jr / Tseng, Shuo-Yen

    Optics express

    2020  Volume 28, Issue 7, Page(s) 10350–10362

    Abstract: We design and fabricate a series of broadband silicon arbitrary power splitters with various split ratios using shortcuts to adiabaticity. In this approach, the system evolution is designed using the decoupled system states, and the desired split ratios ... ...

    Abstract We design and fabricate a series of broadband silicon arbitrary power splitters with various split ratios using shortcuts to adiabaticity. In this approach, the system evolution is designed using the decoupled system states, and the desired split ratios are guaranteed by the boundary conditions. Furthermore, the system evolutions are optimized to be as close to the adiabatic states as possible, thus enhancing the robustness to wavelength and fabrication variations. The devices are more compact then the conventional adiabatic designs. Fabricated devices show broadband response for a wide wavelength range from 1.47 to 1.62 µm and also have excellent robustness against fabrication errors across an 8-inch wafer.
    Language English
    Publishing date 2020-03-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.385995
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Polarization-controlled chirped guided-mode resonance filter incorporating a hybrid splay-twist liquid crystal.

    Chang, Li-Min / Yin, Chuan Ci / Guo, Duan-Yi / Huang, Chia-Wei / Lin, Tsung-Hsien / Wang, Chun-Ta / Hung, Yung-Jr

    Applied optics

    2022  Volume 60, Issue 35, Page(s) 10873–10877

    Abstract: This work develops a tunable chirped guided-mode resonant (GMR) filter that has a hybrid splay-twist (HST) liquid crystal as a cladding layer. The GMR filter is a color reflector that strongly reflects light at the resonance wavelength, and its chirped ... ...

    Abstract This work develops a tunable chirped guided-mode resonant (GMR) filter that has a hybrid splay-twist (HST) liquid crystal as a cladding layer. The GMR filter is a color reflector that strongly reflects light at the resonance wavelength, and its chirped grating structure supports tuning of the resonance peak over a wavelength range of over 50 nm. The HST-LC configuration serves as an achromatic polarization rotator that can rotate the axis of polarization of linearly polarized light by providing effective twist angles in the LC layer under an applied voltage. The HST-LC is used to change the direction of the polarization axis of the light that is reflected by the GMR filter; continuous angles of rotation of ∼90
    Language English
    Publishing date 2022-02-21
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.442509
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Near-infrared spectroscopy using period-chirped Si/SiO/SiO

    Hung, Yung-Jr / Yin, Chuan-Ci / Wu, Zon-Ru / Lin, Chih-Yueh / Kao, Chia-Wei / Kao, Tzu-Chieh / Huang, Chia-Wei

    Optics letters

    2021  Volume 47, Issue 3, Page(s) 561–564

    Abstract: We demonstrate a Si/SiO/ ... ...

    Abstract We demonstrate a Si/SiO/SiO
    Language English
    Publishing date 2021-08-09
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.448024
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Low-loss polysilicon subwavelength grating waveguides and narrowband Bragg reflectors in bulk CMOS.

    Hung, Yung-Jr / Tang, Cheng-Tse / Chen, Tse-Hung / Yen, Tzu-Hsiang / Tsai, Ming-Ju / Lee, San-Liang

    Optics express

    2020  Volume 28, Issue 6, Page(s) 7786–7798

    Abstract: The performance of a photonic functional device in bulk CMOS has been limited by the high propagation loss in polysilicon strip waveguide. Based on the zero-process-change methodology, we successfully reduce the propagation loss of polysilicon waveguide ... ...

    Abstract The performance of a photonic functional device in bulk CMOS has been limited by the high propagation loss in polysilicon strip waveguide. Based on the zero-process-change methodology, we successfully reduce the propagation loss of polysilicon waveguide from 112 dB/cm to only 38 dB/cm by solely engineering the waveguide geometry for the first time. Low propagation loss is attributed to a significantly reduced optical overlap factor of 0.09 to bulk polysilicon using subwavelength grating (SWG) waveguide design. These findings prompt us to demonstrate a narrowband SWG-based cladding-modulated Bragg reflector in bulk CMOS, which provides a full-width at half maximum (FWHM) of 1.63 nm, an extinction ratio of 24.5 dB, and a reduced temperature sensitivity of 27.3 pm/°C. Further reducing the FWHM to 0.848 nm is also achieved by decreasing the grating coupling strength. We believe the achievements made in this work validate a promising design path towards practical photonic-electronic applications in bulk CMOS.
    Language English
    Publishing date 2020-03-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.381894
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Mode-evolution-based silicon-on-insulator 3  dB coupler using fast quasiadiabatic dynamics.

    Hung, Yung-Jr / Li, Zhong-Ying / Chung, Hung-Ching / Liang, Fu-Chieh / Jung, Ming-Yang / Yen, Tzu-Hsiang / Tseng, Shuo-Yen

    Optics letters

    2019  Volume 44, Issue 4, Page(s) 815–818

    Abstract: We report a 2×2 broadband and fabrication tolerant mode-evolution-based 3 dB coupler based on silicon-on-insulator rib waveguides. The operating principle of the coupler is based on the adiabatic evolution of local eigenmodes. The key element of the ... ...

    Abstract We report a 2×2 broadband and fabrication tolerant mode-evolution-based 3 dB coupler based on silicon-on-insulator rib waveguides. The operating principle of the coupler is based on the adiabatic evolution of local eigenmodes. The key element of the device is an adiabatically tapered mode evolution region, which converts two dissimilar waveguides into two identical waveguides. Contrary to conventional designs using a linear taper function where the device adiabaticity is uneven during evolution, we use the fast quasiadiabatic approach to homogenize the adiabaticity of the device, leading to a shortcut to adiabaticity. Devices with an optimized taper region of 26.3 μm are designed and fabricated in a complementary metal-oxide-semiconductor compatible process with 193 nm deep ultraviolet lithography. The measured devices exhibit a broadband 3  dB±0.5  dB splitting within a bandwidth of 100 nm, uniformly across a 200-mm wafer, showing good tolerance against fabrication variations.
    Language English
    Publishing date 2019-02-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.44.000815
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Discontinuity-Enhanced Thin Film Electrocatalytic Oxygen Evolution.

    Shih, Ming-Chi / Jhang, Ren-Huai / Tsai, Ya-Ting / Huang, Chia-Wei / Hung, Yung-Jr / Liao, Mei-Yi / Huang, Jiaxing / Chen, Chun-Hu

    Small (Weinheim an der Bergstrasse, Germany)

    2019  Volume 15, Issue 50, Page(s) e1903363

    Abstract: Thin film electrocatalysts allow strong binding and intimate electrical contact with electrodes, rapid mass transfer during reaction, and are generally more durable than powder electrocatalysts, which is particularly beneficial for gas evolution ... ...

    Abstract Thin film electrocatalysts allow strong binding and intimate electrical contact with electrodes, rapid mass transfer during reaction, and are generally more durable than powder electrocatalysts, which is particularly beneficial for gas evolution reactions. In this work, using cobalt manganese oxyhydroxide, an oxygen evolution reaction (OER) electrocatalyst that can be grown directly on various electrodes as a model system, it is demonstrated that breaking a continuous film into discontinuous patches can significantly enhance the overall OER performance without sacrificing long-term stability even under elevated electrocatalytic stress. Discontinuous films with higher edge-to-area ratios exhibits reduced overpotentials, increased turnover frequency, and more pronounced current increase after electrochemical conditioning. Operando Raman spectroscopy studies during electrocatalysis reveal that the film edges require lower potential barrier for activation. Introducing discontinuity into thin film electrocatalysis can thus lead to the realization of high performance yet highly robust systems for harsh gas evolution reactions.
    Language English
    Publishing date 2019-10-14
    Publishing country Germany
    Document type Journal Article
    ISSN 1613-6829
    ISSN (online) 1613-6829
    DOI 10.1002/smll.201903363
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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  9. Article ; Online: Optical spectrometer based on continuously-chirped guided mode resonance filter.

    Hung, Yung-Jr / Kao, Chia-Wei / Kao, Tzu-Chieh / Huang, Chia-Wei / Lin, Jia-Jin / Yin, Chuan-Ci

    Optics express

    2018  Volume 26, Issue 21, Page(s) 27515–27527

    Abstract: In this work we introduce a tunable GMR filter based on continuously period-chirped (ΔP = 130 nm) gratings using a ... ...

    Abstract In this work we introduce a tunable GMR filter based on continuously period-chirped (ΔP = 130 nm) gratings using a Ta
    Language English
    Publishing date 2018-11-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.26.027515
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Higher order mode supercontinuum generation in tantalum pentoxide (Ta

    Fan, Ranran / Lin, Yuan-Yao / Chang, Lin / Boes, Andreas / Bowers, John / Liu, Jia-Wei / Lin, Chao-Hong / Wang, Te-Keng / Qiao, Junpeng / Kuo, Hao-Chung / Lin, Gong-Ru / Shih, Min-Hsiung / Hung, Yung-Jr / Chiu, Yi-Jen / Lee, Chao-Kuei

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 7978

    Abstract: We fabricated tantalum pentoxide ( ... ...

    Abstract We fabricated tantalum pentoxide (Ta
    Language English
    Publishing date 2021-04-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-86922-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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