Research

Structural colors

>Active Structural Colors

Active electrochemical high-contrast gratings as on/off switchable and color tunable pixels

Color tuning across a wide gamut and switching between colored and dark states in a single pixel has, so far, not been realized in dynamic structural colors. Here we present a design that achieves both functions using the selective activation of grating resonances and plasmonic absorption through applied bias.

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Nature Communications 2022,13,3391

>High Vibrancy and Spatial Resolution

Ultrahigh resolution and color gamut with scattering-reducing transmissive pixels

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Nature Communications 2019,10,4782

>Disordered Systems

One of the challenges preventing structural colors from reaching commercial applicability is the complexity and cost associated with the fabrication. This problem arises because the structural color designs demand uniform and highly ordered patterns, necessitating the use of lithographic techniques. We can overcome this problem by generating structural colors from disordered and polydisperse systems, which enables the use of scalable and cheap solution-based methods for fabrication.

Generating Color from Polydisperse, Near Micron-Sized TiO2 Particles

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ACS Appl. Mater. Interfaces 2017,9,28,23941-23948

>Humidity Responsive Colors

Below, we show an example of an ultrafast humidity-responsive colorimetric sensor made from titania resonators that runs on ultralow power (30 uW), produces one of the fastest response times of ~30ms, maintains optimum performance at a monolayer, and consists of a single material (titania) that facilitates recyclability.

Ultrafast humidity-responsive structural colors

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J. Mater. Chem. A, 2019,7, 10561-10571

>Photovoltaics

There has been rising interest in endowing windows with photovoltaic functionality while providing aesthetic appeal through the display of different colors. Traditionally, organic photovoltaics have been used to produce colorful solar cells. However, distinct colors required the use of distinct active materials, causing differences in photovoltaic performance. We are working on the production of colorful solar cells with uniform performance using one type of active material to display a variety of different colors through the replacement of the counter electrode with a photonically engineered one.

Semitransparent Blue, Green and Red Organic Solar Cells Using Color Filtering Electrodes

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Advanced Optical Materials, 6 (13), 1800051, 2018

Passive Microwave absorption devices

> Metasurfaces

The ability to completely absorb an electromagnetic(EM) wave with a material much thinner than the wavelength is a prerequisite for achieving ultacompact, flexible, and lightweight EM devices. Herein, a perfect microwave metamaterial absorber as thin as 1/1250 of the target wavelength was designed by coupling an array of patch antennas to an array of apertures to dramatically enhance the inductance, and, by placing a reflector underneath to achieve zero reflection via wave interference.

Coupled solid and inverse antenna stacks above metal ground as metamaterial perfect electromagnetic wave absorbers with extreme subwavelength thicknesses

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Advanced Optical Materials, 10, 2101672, 2022

> Microwave Absorbing Nanocomposites

Microwave Absorption in micron-sized tetragonal BaTiO3 particles

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J. Mater.Chem.C, 2018, 6, 9749-9755

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