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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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Optimized grating as an ultra-narrow band absorber or plasmonic sensor
Optics Letters
|April 3, 2014
Summary
This study demonstrates lamellar gratings achieve total absorption with ultra-narrow spectral and angular widths. This unique property enables applications in highly directional thermal emission and sensitive plasmonic sensing.
Area of Science:
- Nanophotonics and Plasmonics
- Optical Metamaterials
Background:
- Lamellar gratings are periodic structures with potential applications in optics.
- Achieving high absorption and narrow spectral features is crucial for advanced optical devices.
Purpose of the Study:
- To investigate the optical properties of lamellar gratings using theoretical and numerical methods.
- To explore the potential of these gratings for thermal emission and sensing applications.
Main Methods:
- Temporal coupled-mode theory was employed for theoretical analysis.
- Numerical simulations were conducted to validate the theoretical predictions.
Main Results:
- Optimized lamellar gratings achieved total absorption with a narrow full width at half-maximum (FWHM) of 0.4 nm.
- The gratings exhibited high absorption within an ultra-narrow angular range, suitable for directional emission.
- A large sensitivity of 1400 nm/RIU and a figure-of-merit of 2300/RIU were obtained for refractive index sensing.
Conclusions:
- Lamellar gratings can be engineered for efficient light absorption and directional thermal emission.
- The high sensitivity and figure-of-merit indicate significant potential for plasmonic sensing applications.
