Johns Hopkins
Engineering Design Day

Tuesday, May 4, 2021

The Johns Hopkins Engineering community is creating a better future, translating theoretical knowledge into real-world solutions.

 

Join us on Tuesday, May 4 for a virtual celebration showcasing student innovation and creativity at Hopkins Engineering annual Design Day!

design projects

engineering students

project directors

Design Day Projects


Structural optimization and shape-tuning for spectrally selective optoelectronic films

Team: Tina Gao

Program: Electrical and Computer Engineering

The ability to tune photonic crystals (PCs) to spectrally select wavelengths of interest has great merit for many optoelectronic devices, such as multijunction solar cells. Here, we build off of pre-existing research on how material absorption effects the properties of photonic bands by integrating a wavelength-dependent permittivity model of lead-sulfide (PbS) thin-film quantum dots (QDs). We generated a periodic PbS PC slab that optimizes absorption in the infrared (IR) with varying degrees of weights on the importance of this absorption, and we demonstrated consistency with basic understandings of spectral interference as well as observed the interesting phenomenon of natural groupings of structures based on the value of the weights. Then, we investigated the effect of non-symmetrical unit cell configurations on the spectral profile. We discovered that the spectra of these non-geometric configurations have very rich spectral features indicating set of design parameters for intricate spectral tuning and selectivity in absorbing films.
Future work will involve utilizing deep learning (DL) to produce fast methods for predicting the spectra of the given PC and to reverse engineer the PC from a specified spectra.

Sponsors

  • Susanna Thon

Mentors

  • Sreyas Chintapalli
  • Yida Lin
  • Susanna M. Thon

Team Members

  • Tina Gao
  • Sreyas Chintapalli
  • Yida Lin
  • Susanna M. Thon

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