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Miniaturized disordered photonic molecule spectrometer.

Yujia Zhang1, Tom Albrow-Owen2, Zhenyu Zhao1

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This summary is machine-generated.

Researchers developed an ultra-miniaturized disordered photonic molecule spectrometer. This novel device overcomes size and resolution limitations in current computational spectrometers, enabling high-performance portable spectroscopy.

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Area of Science:

  • Photonics
  • Spectroscopy
  • Integrated Optics

Background:

  • Computational spectrometers offer miniaturized, on-chip solutions for in-situ measurements.
  • Current systems face limitations in encoder performance, with redundant response matrices hindering miniaturization.
  • The trade-off between size, resolution, and bandwidth limits spectral encoders, requiring long optical paths for high resolution.

Purpose of the Study:

  • To report a groundbreaking ultra-miniaturized disordered photonic molecule spectrometer.
  • To overcome the resolution-bandwidth-footprint limitations of existing spectrometers.
  • To demonstrate a novel approach for high-performance, manufacturable miniaturized spectroscopy.

Main Methods:

  • Utilized complicated electromagnetic coupling to generate quasi-random spectral response matrices.
  • Employed dynamic manipulation of photon frequency, amplitude, and phase.
  • Constructed the spectrometer on a CMOS-compatible integrated photonics platform.

Main Results:

  • Achieved an effectively infinite free spectral range (FSR) with a high Q-factor (>7.74 × 10^5).
  • Demonstrated a broad operational bandwidth exceeding 100 nm.
  • Attained ultra-high spectral resolution of 8 pm within an ultra-compact footprint (70 × 50 μm²).

Conclusions:

  • The disordered photonic molecule spectrometer surpasses current resolution-bandwidth-footprint metrics.
  • The novel quasi-random response matrices overcome fundamental limitations in miniaturized spectrometers.
  • This technology presents a pioneering approach for high-performance, manufacturable miniaturized spectroscopy.