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Hi, this is Ke Lin. I am a senior student in Department of Physics, Shanghai Jiao Tong University (SJTU).
In Summer 2023, I visit Harvard and work as a full-time undergraduate research fellow in Prof. Eric Heller's Group. Our potential project are superwire,
From Jan 2023 to May 2023, I am an exchange student at Massachusetts Institute of Technology (MIT). I select the following class, 8.292[J] Fluid Physics, 8.422 Atomic and Optical Physics II, 8.431[J] Nonlinear Optics.
From Sept 2021 to now, I work as a part-time undergraduate researcher in Prof. Fangwei Ye's Group. My research topic are 3-Dimensional Branched Flow and Nonlinear Branched Flow.
From Apr 2020 to Sept 2021, I work as the team leader of representative team of Shanghai Jiao Tong University, participated in the China Undergraduate Physics Competition (CUPT, IYPT in China). We got First Prize in the final defense of our experiment result, this is the first time our school had got this prize since attending this competition. Here is a brief introduction to our research.
My research interests lie in the following four parts: Branched Flow, Novel state in Factal system, Non-Hermitian Topological Physics in Photonics.
Feel free to contact me if you have any question about my research. Although I am an undergraduate student, I am very happy to discuss the above research with you！
(*: Equal Contribution)
⦁ K. Lin, Z. Y. Liu, J. W. Qin, Q. D. Fu, P. Wang, F. W. Ye, “Observation of Stable Branched Flow of Light in Photorefractive Crystals”, Physical Review Letter (in preparation)
⦁ Z. P. Fu, Z. W. Zhang, K. Lin*, D. Wu, J. Zhang, “Stopping power of high-density alpha-particle clusters in warm dense deuterium-tritium fuels”, Physics of Plasmas 1 July 2023; 30 (7): 072708. https://doi.org/10.1063/5.0156388
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Dynamic tunneling effect of semi-classical superwire
⦁ Extend study of superwire to three dimension using split-operator method
⦁ Figure out the difference between superwire and supercolimation beam in Photonics Crystal
⦁ Find breathing parallel superwire and its analogy with Gaussian wave packet in a harmonic well
⦁ Add deformation potential in superlattice and find disorder-free superwire
⦁ Construct band structure of square lattice with Fermi potential and find corresponding flat band in high index band (High Brillouin Zone)
Branched flow of the light (Zhiyuan Scholar Program, CN$100,000)
Part 1: (1+1)D and (2+1)D experimental realization
⦁ Use Split-Step FFT to simulate branch flow of light in both 2D & 3D random potential field (weak disorder)
⦁ Construct 2D & 3D, isotropic & anisotropic Gaussian-correlated random potential in a photorefractive SBN:61 crystal
⦁ Observe both (1+1)D and (2+1)D branched flow in a photorefractive SBN:61 crystal
Part 2: Theoretical study of nonlinear branched flow
⦁ Use Fokker-Planck approach to explain the formation of caustics and branched flow
⦁ Explain the influence of the non-linear self-trap effect on the characteristics of the branch flow
⦁ Use 8th Gaussian beam to create initial effective refractive index to verify the non-linear effect
⦁ Discover smartly non-linear self-routing of soliton propagating in weak disorder random potential
Nonlinear topological Thouless pumping in optical lattice
⦁ Mastered the theory of topological insulator, topological photonics and photonics band gap material
⦁ Stimulate the wave packet transportation in Thouless pumping with different nonlinear amplitude
⦁ Use MATLAB code calculating band structure for Thouless pumping in one and two dimensions
Measuring forces with the optical trap
⦁ Measure the laser’s power-dependent force on water droplets
⦁ Assemble the self-designed optical trap, use it to capture glass beads and control their motion
⦁ Use optical trap to measure the twisting force that the bacterial motor (E. coli) generates
Experimental Observation of Branched Flow
⦁ Create isotropic and anisotropic gaussian-correlated random lattice both in 2D and 3D using optical induction based on a photorefractive SBN:61 crystal
⦁ Record the light intensity pattern using a charge-coupled device (CCD) at different facet of the crystal
Measurement of plasmon wavelength on graphene surfaces
⦁ Use Atomic Force Microscopy (AFM) to measure the thickness of graphene
⦁ Use Scattering-type Scanning Near-field Optical Microscope (SNOM) to measure the wavelength of graphene surface plasmon resonance
Measuring forces with the optical trap (optical tweezers)
⦁ DIY an optical tweezers and assemble the self-designed optical trap
⦁ Use 5mW Nd: YAG 532nm laser to trap beads and measure the maximum force it generates
Study of stopping power of α-clusters in warm dense hydrogen
⦁ Use Tianhe-2 supercomputer to simulate alpha-cluster propagation in Warm Dense Matter (WDM)
⦁ Explain the influence of alpha-clusters by the interference of wake field
⦁ Rongchang Scholarship of Science Innovation (Best 10 undergraduates in SJTU, CNY30,000), 2022
⦁ A-Level Scholarship, Shanghai Jiao Tong University (Top 1%), SJTU, 2021&2022
⦁ National Scholarship, Ministry of Education of China, 2021
⦁ Hanyingjuhua Scholarship (Best 15 undergraduates in Zhiyuan Collage, CNY15,000), 2021
⦁ 1st Prize in China Undergraduate Physics academic Tournament (CUPT) First time for SJTU, 2021
As a leader of the team on behalf of SJTU, won 1st Prize for the first time