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Very-large-scale-integrated high quality factor nanoantenna pixels.

Varun Dolia¹, Halleh B Balch², Sahil Dagli²

¹Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA. vdolia@stanford.edu.

Nature Nanotechnology

|July 3, 2024

Summary

Researchers developed silicon nanoantenna pixels (VINPix) that simultaneously achieve high quality factors, subwavelength mode volumes, and controlled light radiation. This breakthrough overcomes traditional trade-offs, enabling compact and densely multiplexed optical devices.

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Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Metasurfaces offer precise control over light's amplitude, polarization, and phase.
Key resonator metrics include quality factor (Q factor), mode volume (V_m), and radiation control.
Traditional resonators often face trade-offs between these critical performance parameters.

Purpose of the Study:

To demonstrate that high Q factor, subwavelength V_m, and controlled far-field radiation can be achieved simultaneously in metasurface resonators.
To introduce a novel design for silicon nanoantenna pixels (VINPix) that integrates guided mode resonance waveguides and photonic crystal cavities.
To showcase the potential of VINPix for advanced optical applications through proof-of-concept demonstrations.

Main Methods:

Design and fabrication of very-large-scale-integrated silicon nanoantenna pixels (VINPix).
Integration of guided mode resonance waveguides with photonic crystal cavities within nanoantennas.
Characterization of Q factor, V_m, and far-field scattering properties of individual nanoantennas.

Main Results:

Achieved Q factors exceeding 1,500 with V_m below 0.1 .
Demonstrated individually addressable nanoantennas with dipole-like far-field scattering.
Attained resonator densities over one million per cm².
Fabricated an 8 mm × 8 mm VINPix array for spectrometer-free refractive-index sensing.

Conclusions:

The VINPix platform overcomes inherent trade-offs in resonator design, enabling simultaneous optimization of Q factor, V_m, and radiation control.
VINPix technology facilitates the development of compact, highly multiplexed optical devices.
Applications include spatial light modulators, computational spectrometers, and in situ environmental sensors.