MSc Y Xin

1. Power-Efficiency Evolution of Capacitive Sensor Interfaces
   Zhichao Tan; Hui Jiang; Huajun Zhang; Xiyuan Tang; Haoming Xin; Stoyan Nihtianov;
   {IEEE} Sensors Journal,
   Volume 21, Issue 11, pp. 12457--12468, June 2021. DOI: 10.1109/jsen.2020.3035109
   document

2. Single-Mode Tapered Vertical SU-8 Waveguide Fabricated by E-Beam Lithography for Analyte Sensing
   Y. Xin; G. Pandraud; Y. Zhang; P. French;
   Sensors,
   Volume 19, pp. 12, 2019. DOI: 10.3390/s19153383
   
   Keywords: ...

   E-beam lithography, evanescent sensing, single-mode, SU-8 photoresist, taper, vertical waveguide.
   
   
   Abstract: ...

   In this paper, we propose a novel vertical SU-8 waveguide for evanescent analyte sensing. The waveguide is designed to possess a vertical and narrow structure to generate evanescent waves on both sides of the waveguide's surface, aimed at increasing the sensitivity by enlarging the sensing areas. We performed simulations to monitor the influence of different parameters on the waveguide's performance, including its height and width. E-beam lithography was used to fabricate the structure, as this one-step direct writing process enables easy, fast, and high-resolution fabrication. Furthermore, it reduces the sidewall roughness and decreases the induced scattering loss, which is a major source of waveguide loss. Couplers were added to improve the coupling efficiency and alignment tolerance, and will contribute to the feasibility of a plug-and-play optical system. Optical measurements show that the transmission loss is 1.03 ± 0.19 dB/cm. The absorption sensitivity was measured to be 4.8 dB per refractive index unit (dB/RIU) for saline solutions with various concentrations.

3. Vertical SiC taper with a small angle fabricated by slope transfer method
   Yu Xin; Gregory Pandraud; Paddy J. French;
   Electronics Letters,
   Volume 55, Issue 11, pp. 661--663, May 2019. DOI: 10.1049/el.2019.0232
   
   Abstract: ...

   In this Letter, a slope transfer method to fabricate vertical waveguide couplers is proposed. This method utilises wet etched Si as a mask, and takes advantage of dry etching selectivity between Si and SiC, to successfully transfer the profile from the Si master into SiC. By adopting this method, a <2° slope is achieved. Such a taper can bring the coupling efficiency in SiC waveguides to 80% (around 1 dB loss) or better from around 10% (10 dB loss) without taper. It further increases the alignment tolerance at the same time, which ensures the successful development of a plug-and-play solution for optical sensing. This is the first reported taper made in SiC.

4. Single-Mode Tapered Vertical SU-8 Waveguide Fabricated by E-Beam Lithography for Analyte Sensing
   Yu Xin; Gregory Pandraud; Yongmeng Zhang; Paddy French;
   Sensors,
   Volume 19, Issue 15, pp. 3383, August 2019. DOI: 10.3390/s19153383

5. Vertical SiC taper with a small angle fabricated by slope transfer method
   Y Xin; G Pandraud; P.J. French;
   Electronics Letters,
   Volume 55, pp. 661-663, 2019. DOI: 10.1049/el.2019.0232
   
   Abstract: ...

   In this Letter, a slope transfer method to fabricate vertical waveguide couplers is proposed. This method utilises wet etched Si as a mask, and takes advantage of dry etching selectivity between Si and SiC, to successfully transfer the profile from the Si master into SiC. By adopting this method, a <2° slope is achieved. Such a taper can bring the coupling efficiency in SiC waveguides to 80% (around 1 dB loss) or better from around 10% (10 dB loss) without taper. It further increases the alignment tolerance at the same time, which ensures the successful development of a plug-and-play solution for optical sensing. This is the first reported taper made in SiC.

6. Horizontal and vertical tapered waveguides for evanescent wave sensing
   Y. Xin; X.W. Meng; G. Pandraud; L.S. Pakula; P.J. French;
   In The Conference for ICT-Research,
   Netherlands, NWO, STW and IPN, March 2017.

7. Tapered SU8 Waveguide for Evanescent Sensing by Single–Step Fabrication
   Y. Xin; G.Pandraud; A. van Langen-Suurling; P.J. French;
   In Ravinder Dahiya, Srinvas Tadigadapa (Ed.), IEEE Sensors,
   Glasgow, UK, IEEE, IEEE Sensors Council, pp. 4, November 2017.
   
   Keywords: ...

   vertical waveguide, SU-8, Evanescent wave.
   
   
   Abstract: ...

   In this paper, a novel vertical waveguide made from SU8 photoresist is proposed for the first time to be used in an evanescent bio-medical optical sensor. The vertical structure increases the sensing area and can be fabricated in a one-step lithography step enabling easy and high-resolution fabrication and making this waveguide attractive in optical sensing. Tapers were added to the system improving the alignment tolerance and enabling the manufacturing of plug-and-play optical system.
   
   ISBN: 978-1-5090-1012-7

8. Design and fabrication of two types of tapered waveguides for evanescent sensing
   Y. Xin; Y.M. Zhang; G. Pandraud; P.J. French;
   In International Smart System Integration,
   Cork, Ireland, mesago, March 2017.

9. A Novel Free-standing Evanescent Waveguide for Sensing
   X.W. Meng; Y. Xin; P. J. French;
   In The COMSOL Conference,
   Rotterdam, NL, COMSOL, October 2017.

10. Detection of Anastomotic Leakage after Colon Surgery by Evanescent Waveguide
    Y. Xin; G. Pandraud; L. Pakula; P.J. French;
    In The Conference for ICT-Research,
    Netherlands, NOW, STW and IPN, March 2016.

11. Optimisation of Bio-medical Optical Waveguide
    Y. Xin; G. Pandraud; L. Pakula; B. Morana; P.J. French;
    In 2016 IEEE NEMS Conference,
    Matsushima, Japan, IEEE, April 2016.

12. Design, Fabrication and Experiments of a Novel Standing SU-8 Evanescent Waveguide for Sensing
    Y.M. Zhang; Y. Xin; G. Pandraud; P.J. French;
    In MicroNano Conference,
    Netherlands, MinacNed, December 2016.

13. Novel fabrication of 3D taper coupler of optical sensing waveguide
    Y. Xin; Y.M. Zhang; G. Pandraud; P.J. French;
    In Sensor Technology Conference Sense of Contact,
    Netherlands, December 2016.

14. Combination of LPCVD and PECVD SiC in fabricating evanescent waveguides
    Yu Xin; Gregory Pandraud; Lukasz S. Pakula; Bruno Morana; Paddy J. French;
    In 2016 IEEE 11th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS),
    April 2016. DOI: 10.1109/NEMS.2016.7758311
    
    Abstract: ...

    As a promising material in MEMS field, SiC is widely used to fabricate sensors in many applications. Considering its fabrication potential and optical properties, SiC was chosen as the core material of evanescent waveguide sensor in this paper. LPCVD and PECVD deposition were combined in fabricating the waveguide. To reduce the coupling loss and misalignment effect, 3D tapered couplers were designed to be added to the input and output of the waveguide and a novel slope transfer method was investigated to fabricate the taper slope. In initial experiments we have achieved a slope of 16.7°.

15. Optimisation of Bio-medical Optical Waveguide
    Y. Xin; A. Purniawan; L. Pakula; G. Pandraud; P.J. French;
    In International Smart System Integration,
    Copenhagen, Denmark, mesago, March 2015.

16. Detection of Anastomotic Leakage after Colon Surgery by Evanescent Waveguide
    Y. Xin; A. Purniawan; L. Pakula; G. Pandraud; P.J. French;
    In The Conference for ICT-Research,
    Netherlands, NOW, STW and IPN, March 2015.

17. Optical Waveguide with Freestanding Grating Couplers
    Y. Xin; A. Purniawan; G. Pandraud; L. Pakula; P. J. French;
    In IEEE Photonics Conference,
    Twente, the Netherlands, IEEE, Nov 2014.

18. Simulation of Bio-medical Waveguide in Mechanical and Optical Fields
    Y. Xin; A. Purniawan; L. Pakula; G. Pandraud; P. J. French;
    In The COMSOL Conference,
    Cambridge, UK, COMSOL, Sep 2014.

19. A freestanding thin film evanescent waveguide sensor for biomedical application
    Y. Xin; S.A. van’t Hof; A. Purniawan; L.S. Pakula; G. Pandraud; P.J. Trimp; P.J. French;
    In Sensor Technology Conference Sense of Contact,
    The Netherlands, March 2014.

20. Interference management in wireless communication systems: Theory and applications
    Yan Xin; Xiaodong Wang; G. Leus; Guosen Yue; Jinhua Jiang;
    EURASIP J. on Wireless Communications and Networking,
    2010. Article ID 687649.

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