Guided-Mode Resonance in Photonic Structures

Guided-mode resonance (GMR) arises when incident light is diffracted by a subwavelength grating into a leaky waveguide mode, yielding narrow spectral features in reflection or transmission. The phenomenon relies on Fano interference between discrete guided modes and a continuum of radiative states, enabling high quality-factors and strong field localisation. By engineering grating period, modulation depth, waveguide thickness and refractive index contrast, it is possible to tailor resonance wavelength, linewidth and angular dispersion. Photonic crystal slabs and metasurfaces exploit these principles to achieve ultranarrow filters, tunable colour pixels, refractive index sensors and phase-sensitive interferometric schemes. Recent advances have pushed limits of detection for biomolecular assays, combined sensing and imaging on a single chip, and demonstrated portable, label-free diagnostic devices. The global significance of GMR photonic structures spans environmental monitoring, point-of-care diagnostics and integrated optical communications, with ongoing efforts to integrate these elements into scalable, low-cost platforms.

Research from Nature Portfolio

Recent investigations have refined dielectric metasurfaces incorporating nanohole arrays to achieve a favourable trade-off between spectral sharpness and spatial confinement. By designing two optical modes that support sharp Fano resonances with distinct quality-factors, devices have attained picogram-level detection limits for immunoglobulins while simultaneously resolving sub-micrometre biological features. This dual-mode architecture underpins concurrent biochemical sensing and high-resolution imaging, expanding GMR applications into microbiology. Seminal work on phase-sensitive GMR integrated within an interferometric arrangement has achieved unprecedented refractive index sensitivity by tracking rapid phase variations near resonance. This approach delivers detection thresholds approaching 10⁻⁷ refractive index units, establishing a new benchmark for phase-based GMR sensors.

Guided-Mode Resonance in Photonic Structures publication trend

The graph below shows the total number of articles in guided-mode resonance in photonic structures across all publications each year (not limited to Nature Index journals).

Technical terms

Guided-mode resonance (GMR): A resonance phenomenon in which diffracted light couples into a leaky guided mode of a planar waveguide, producing narrow spectral features.

Fano resonance: An asymmetric line shape resulting from interference between a discrete resonance and a continuum, used to sharpen spectral response and enhance sensitivity.

Quality factor (Q-factor): A measure of resonance sharpness, equal to the resonance wavelength divided by the full-width at half-maximum of the spectral feature.

Photonic crystal slab: A dielectric waveguide patterned with a periodic lattice, enabling band-gap effects and diffractive coupling to guided modes.

Bound state in the continuum (BIC): A non-radiating mode embedded within the radiative spectrum, exhibiting negligible radiative loss and theoretically infinite Q-factor.

References

1. Phase-driven progress in nanophotonic biosensing. Light: Science & Applications (2024).
2. Phase noise matching in resonant metasurfaces for intrinsic sensing stability. Optica (2024).
3. Handheld Biosensor System Based on a Gradient Grating Period Guided-Mode Resonance Device. Biosensors (2023).
4. Photonic crystal resonances for sensing and imaging. Journal of Optics (2018).
5. Dielectric nanohole array metasurface for high-resolution near-field sensing and imaging. Nature Communications (2021).
6. Resonant leaky-mode spectral-band engineering and device applications. Optics Express (2004).
7. Guided-mode resonant polarization-controlled tunable color filters. Optics Express (2014).
8. Band gaps and leaky-wave effects in resonant photonic-crystal waveguides.. Optics Express (2007).