Nanophotonics

Heterogeneous Optical Metastructures

 

 

 

 

 

 

 

 

 

 

 

 

Materials challenge for metastructures at visible ranges.

  • High-refractive-index and low-loss materials needed
  • No such material at visible range due to the general trend of high index, low energy bandgap or low-index, high bandgap

We solved this by using heterogeneous materials.

  • High-index, high-loss materials + low-index, low-loss material
  • Optical modes do not overlap with the high-loss materials
  • Reflection bandwidth of >90% reflectivity increased x10.

Yao, Y., Wu, W. (2017), “All-Dielectric Heterogeneous Metasurface as an Efficient Ultra-Broadband Reflector” Advanced Optical Materials. DOI: 10.1002/adom. 201700090.

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Variable-voxel 3D priting

 

We invented a technology to improve 3D printing (stereo lithography)

  • Better resolution, 5x speed improvement
  • Multi-scale fabrication
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Plasmonics

 

We invented a technology to fabricate the plasmonic structures with the highest field enhancement

  • Large area, low cost, high reliability, high precision
  • Open the door for numerous applications

Song, B., Yao, Y., Groenewald, R. E., Wang, Y., Liu, H., Wang, Y., Li, Y., Liu, F., Cronin, S. B., Schwartzberg, A. M., Cabrini, S., Haas, S., Wu, W., “Probing Gap Plasmons Down to Subnanometer Scales Using Collapsible Nanofingers” ACS NANO. DOI: 10.1021/acsnano.7b01468.

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Nano-electrochemistry cells

 

Yifei Wang, S. R. Narayanan, and Wei Wu, “Field-Assisted Splitting of Pure Water based on Deep-sub-Debye-Length Nanogap Electrochemical Cells” ACS NANO. DOI: 10.1021/acsnano.7b04038.

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Email: wu.w@usc.edu
Phone: 213-740-3085
Office: USC Powell Hall 632
  • Recruiting Ph.D. students
  • July 2017: Our paper “Field-Assisted Splitting of Pure Water based on Deep-sub-Debye-Length Nanogap Electrochemical Cells” was just published on ACS NANO.
  • June 2017: Our paper “Probing Gap Plasmons Down to Subnanometer Scales Using Collapsible Nanofingers” was just published on ACS NANO.
  • June 2017: Our paper “All-Dielectric Heterogeneous Metasurface as an Efficient Ultra-Broadband Reflector” was just published on Advanced Optical Materials.
  • June 2017: Yuanrui Li won “The Best Photon Micrograph” award in EIPBN conference. Congratulations!
  • More news ... click for details