National Taiwan Normal University

Advanced optical spectroscopy

HSIANG-LIN LIU
https://scholar.lib.ntnu.edu.tw/en/persons/hsiang-lin-liu/

Research Field

Physics
Introduction

Prof. Hsiang-Lin Liu received his Ph.D. in Physics from the University of Florida, Gainesville in 1997, and then served as a postdoctoral researcher at the University of Illinois Urbana-Champaign. In 1999, he joined the Department of Physics at National Taiwan Normal University (NTNU) and was promoted to full professor in 2006. Furthermore, Prof. Liu has held several administrative positions at NTNU, including Vice President for International Affairs, Associate Vice President for Academic Affairs, Director of the Center for Teaching and Learning Development, and Chair of the Department of Physics. Prof. Liu enjoys swimming, jogging, and reading in his spare time.

We use optical spectroscopy to investigate vibrational and electronic excitations in emerging quantum materials. Our work focuses on low-dimensional semiconductors rather than conventional materials such as traditional metals or bulk semiconductors. Our main methods include Raman, photoluminescence, and spectroscopic ellipsometry.

Research Topics

This research project studies the interaction between DUV light, with wavelengths below 300 nm, and low-dimensional semiconductors. The primary goal is to explore how DUV photons enhance resonant Raman effects and trigger defect-related photoluminescence (PL) and excitonic absorption. To achieve this, we employ DUV-Raman and PL spectroscopy along with spectroscopic ellipsometry to examine second-order vibrational modes and defect-related optical phenomena that are challenging to detect using visible or near-infrared light. Additionally, we incorporate Quantum Espresso calculations to investigate electron-phonon interactions, defect coupling mechanisms, and excitonic resonances. This project aims to deepen understanding of DUV photon-matter interactions in low-dimensional semiconductors, with potential applications in quantum light sources and detectors. 

Honor

International keynote and invited talks

  1. August 3, 2025, 2025 SPIE Optics and Photonics, San Diego, USA, Invited Speaker:  DUV-Raman and photoluminescence studies of SWNT@BNNT hetero-nanotubes. 
  2. March 3, 2025, The 68th Fullerenes-Nanotubes-Graphene General Symposium, Nagoya, Japan, Invited Speaker: DUV-Raman and photoluminescence studies of SWNT@BNNT hetero-nanotubes. 
  3. July 11, 2024, 2024 Taiwan International Raman Spectroscopy Symposium, Taipei, Taiwan, Invited Speaker: DUV Raman studies of one- and two-dimensional materials.
  4. March 21, 2023, Perspectives and Challenges in One- and Two-Dimensional Materials Science, Tohoku University, Japan, Invited Speaker: Deep-UV optical studies of two-dimensional materials.
  5. February 20, 2023, Workshop in honor of Prof. Millie and Gene Dresselhaus and Celebrating the retirement of Prof. Riichiro Saito, Boston, USA, Invited Speaker: DUV Raman studies of two-dimensional materials.
  6. October 12, 2022, Taiwan-Japan International Symposium on Raman spectroscopy, Tokyo, Japan, Invited Speaker: Exploring the deep-ultraviolet vibrational and electronic excitations of monolayer graphene.
  7. September 1, 2022, The 63rd Fullerenes-Nanotubes-Graphene General Symposium, Tokyo, Japan, Invited Speaker: Exploring the deep-ultraviolet vibrational and electronic excitations of monolayer graphene.
  8. November 4, 2021, The 1st International Conference on Sciences Development and Technology, Medan, Indonesia, Keynote Speaker: Two-dimensional materials: Prospects and Challenges.
  9. November 6, 2019, The 4th International Symposium of Current Progress in Functional Materials, Bali, Indonesia, Keynote Speaker: Two-dimensional materials: Prospects and Challenges.
  10. August 28, 2018, The 26th International Conference on Raman Spectroscopy, Jeju Island, Korea, Invited Speaker: Deep-ultraviolet Raman scattering studies of two-dimensional materials.
  11. May 24, 2018, Japan/Taiwan International Symposium on Raman Spectroscopy, Tokyo, Japan, Invited Speaker: Resonant Raman scattering studies of two-dimensional materials.
  12. May 20, 2017, The 6th National Physics Seminar Faculty of Mathematics and Sciences State University of Jakarta, Jakarta, Indonesia, Keynote Speaker: Advances in Physics and Beyond.
  13. December 1, 2016, Global Photonics 2016, Osaka, Japan, Invited Speaker: Deep-ultraviolet Raman scattering studies of two-dimensional materials.
  14. November 13, 2015, Joint International Symposium on Mathematics and Physics, 20th Rev. Fr. Ciriaco Pedrosa, O.P. Memorial Lecture Series, Philippines, Invited Speaker: Optical properties of novel monolayer materials.
  15. November 7, 2014, SKKU International Symposium on recent progress in Physics for the 60th anniversary of Physics Department, Korea, Invited Speaker: THz response of graphene-based materials.
  16. October 5, 2012, The 2nd International Conference of Asia Union of Magnetic Societies, Japan, Invited Speaker: Effect of magnetic field on the optical properties in graphite nanoplatelet films.
  17. April 22, 2011, WHMFC The International Workshop on Frontier Science in Pulsed High Magnetic Fields, China, Invited Speaker: Magneto-spectroscopy studies of graphite nanoplatelet films.
  18. March 20, 2000, APS March Meeting 2000, Minneapolis, U. S. A., Invited Speaker: Optical studies of charge ordering and 2-phase behavior in manganites.
  19. February 21, 2000, The 6th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors, Houston, U. S. A., Invited Speaker: Electronic Raman scattering in Bi2Sr2CaCu2O8+δ excited with c-axis polarized light.
Educational Background
  1. Ph.D. in Physics, Department of Physics, University of Florida, USA (1993-1997)
  2. MS in Physics, Department of Physics, National Tsing Hua University, Taiwan (1988-1990)
  3. BS in Physics, Department of Physics, Tamkang University, Taiwan (1984-1988)

Job Description

  1. Optical studies of low-dimensional semiconductors
  2. Students are expected to commit to a 2–3 month internship period
  3. A monthly stipend of up to NT$30,000 will be provided

Preferred Intern Educational Level

We would like to invite fourth-year undergraduate students and first-year master’s students to participate.

 

Skill sets or Qualities

  1. Good English communication skills.
  2. Self-motivated in research.
  3. Good teamwork skills.