Structural colors and ultrasonics by light interaction with nanostructures



Structural colors have shown great promise as an alternative for the existing colorant-based filters owing to their noticeable advantages, which may find potential applications in energy-efficient displays, high-resolution imaging, special effect coatings, and building-integrated photovoltaics. The structural colors can be produced by exploiting optical resonances in various resonators, which can be either 3D, 2D or 1D structures, and can be measured in transmission, reflection or scattering from the designed structures. Some examples include surface plasmon resonances in plasmonic nanoresonators, guided-mode resonances in slab waveguide gratings, and optical resonances in thin-film structures. I will discuss the guiding principles, with an emphasis on structural simplicity, and scalability to practical manufacturing.  Light interacting with CNT/polymer composite can be used to generate strong ultrasound signals via optoacoustic effect, which could lead to non-invasive and high-precision therapeutic applications in the future. Using similar concept, a new THz detection scheme is developed: rather than directly measuring the electromagnetic wave itself, a polymer microring photonic resonator based high-sensitivity acoustic detector is used to “listen to” the sound wave generated by the nano-material absorbing the THz energy. Compact, room-temperature and real-time THz detector can be realized. 

Short Bio

L. Jay Guo started his academic career at the University of Michigan in 1999, and has been a full professor of Electrical Engineering and Computer Science since 2011, and affiliated with Applied Physics program, Mechanical Engineering, Macomolecular Science and Engineering. He has more than 210 refereed journal publications with over 25,00 citations, and ~ 20 US patents. Many published work from his lab have been featured by numerous media. He was the recipient of the Research Excellence Award from the College of Engineering at UM and Outstanding Achievement Award from the EECS department. He served on a number of international conference program committees related to nanotechnologies and photonics. His group’s researches include polymer-based photonic devices and sensor applications, organic and hybrid photovoltaics, plasmonic nanophotonics, nanoimprint-based and roll to roll nanomanufacturing technologies.