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アフシャン ベガム アフシャン ベガム
305-0044 茨城県つくば市並木1-1 [アクセス]



Topological Photonics, Photonic Crystals, Optical waveguides, Silicon & GaAs material, FEM computation

My technical interests in very wide terms is Topological Photonics, creating a one-way photonic waveguide paving way to a secure quantum network for communication & monetary transaction. It includes study of photons, their chiral nature, one-way waveguides & its fabrication. I focus on realizing Photonic Crystal Dirac cones in Silicon and Gallium Arsenide. Dirac cones are known for their linear dispersion, which will aid in creating lossless waveguides by exploring topological aspects. My analysis methodology includes semi-analytical modelling of secular equations for dispersion in waveguides, mathematical analysis by FEM & MATLAB. I have fabricated Photonic Crystal arrays, grating couplers & line-defect waveguides by CMOS-compatible techniques in SOI. Currently, I am learning thin film deposition & analysis techniques for Silicon Dioxide, to enhance light coupling to waveguides.


Grating in Silicon wafer, aspect ratio of 60 nm / 60 nm.
Fabrication date 08 January 2021



Japan Physical Society, SPIE, OSA - The Optical Society, Institute of Electrical and Electronics Engineers, Optical Society of India, American Physical Society


  • NIMS Student Seminar Award, Doctoral course, year 2. Title, "Scheme to utilize Photonic Crystal Dirac Cone for waveguiding & lasing demonstration" (2020)
  • NIMS Student Seminar Award, Doctoral course, year 1. Title, "Topological Waveguide for Entangled Photon Pair Dissociation" (2019)