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Updated: Jun 28, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Optical Metasurfaces with Double-Sided Guided Mode Resonances for Dual-Band Sensing.

Chavez Fk Lawrence¹, Akhila Mallavarapu¹, Michelle Riemann¹

¹Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

|June 26, 2026

Summary

This summary is machine-generated.

Researchers created dual-band dielectric metasurfaces using nanoimprint lithography for tunable optical devices. These metasurfaces enable precise, multifunctional applications like advanced humidity sensors.

Keywords:

dielectric metasurface double-sided dual-band guided-mode resonance nanocrystal optical sensor

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Area of Science:

Nanotechnology
Materials Science
Optics

Background:

Dielectric metasurfaces offer unique optical properties.
Guided-mode resonances (GMRs) are crucial for optical device functionality.
Scalable fabrication methods are needed for advanced optical devices.

Purpose of the Study:

To develop a scalable method for fabricating dual-band dielectric metasurfaces.
To achieve independent spectral control of GMRs in stacked gratings.
To demonstrate a multifunctional optical device for sensing applications.

Main Methods:

Large-area nanoimprint lithography of colloidal titanium dioxide (TiO2) nanocrystal inks.
Fabrication of vertically stacked, double-side gratings.
Incorporation of a spacer layer with a polydimethylsiloxane (PDMS) blocking layer for differential sensing.

Main Results:

Achieved high-quality factor, dual-band GMRs with independently tunable periodicity.
Demonstrated spectrally distinct GMRs through tailored grating structures.
Successfully developed a differential humidity sensor utilizing the metasurface's unique properties.

Conclusions:

Established a versatile strategy for monolithic, multifunctional optical devices.
High accuracy and tunable performance achieved through scalable fabrication.
Potential for advanced optical sensing and integrated photonic applications.