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Optical emitter based on micro-scaled photonic structures.

Kwong-Kit Choi, Achyut K Dutta

    Optics Express
    |February 25, 2022
    PubMed
    Summary

    A novel midwave infrared light emitting device (LED) utilizes micro-scaled photonic structures and resonators to enhance light emission and extraction efficiency through localized surface plasmons (LSP). This design also functions as a wavelength-selective emitter for thermal radiation control.

    Area of Science:

    • Optoelectronics
    • Photonics
    • Materials Science

    Background:

    • Midwave infrared (MWIR) light emitting devices (LEDs) require improved internal quantum efficiency and light extraction efficiency.
    • Localized surface plasmons (LSP) offer potential for optical confinement and enhanced light-matter interactions.
    • Resonator structures are key for managing light emission and extraction in optoelectronic devices.

    Purpose of the Study:

    • To propose a novel micro-scaled photonic structure coupled to a resonator for MWIR LEDs.
    • To enhance internal emission quantum efficiency using LSP.
    • To improve light extraction efficiency by resonating LSP with the device's radiating mode.

    Main Methods:

    • Design of a micro-scaled photonic structure to generate localized surface plasmons (LSP).

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  • Integration of the photonic structure with a resonator cavity within the LED.
  • Analysis of optical confinement and resonance effects for efficiency enhancement.

    • Main Results:

    • Significant optical confinement achieved near the surface via LSP, boosting internal quantum efficiency.
    • Resonance between LSP and the LED's radiating mode enhanced light extraction efficiency.
    • Demonstrated potential for wavelength-selective passive emission to suppress thermal radiation.

    Conclusions:

    • The proposed micro-scaled photonic structure coupled to a resonator offers a viable pathway for highly efficient MWIR LEDs.
    • The design principles are applicable to both active light emission and passive thermal radiation control.
    • This versatile emitter structure holds promise for diverse optoelectronic applications.