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Tunable colloidal quantum dot distributed feedback lasers integrated on a continuously chirped surface grating.

Hyunho Jung1, Changhyun Han, Hanbit Kim

  • 1Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea. hsjeon@snu.ac.kr.

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|December 6, 2018
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Summary
This summary is machine-generated.

Researchers developed a colloidal quantum dot (CQD) laser with a chirped grating, enabling single-mode lasing with spatially dispersed wavelengths on a single chip. This innovation advances tunable laser technology for integrated photonic devices.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Colloidal quantum dots (CQDs) offer tunable optoelectronic properties.
  • Distributed feedback (DFB) lasers require precise grating structures for wavelength selection.
  • Achieving spatially dispersed lasing on a single chip is a key challenge in integrated photonics.

Purpose of the Study:

  • To demonstrate a novel CQD DFB laser with a chirped grating.
  • To achieve single-mode lasing with spatially dispersed wavelengths on a chip.
  • To explore the fabrication of chirped gratings using modified lithography for CQD integration.

Main Methods:

  • Fabrication of a period-chirped surface grating using a modified Lloyd-type laser interference lithography setup with a concave mirror.
  • Preparation of a dense red-emitting CdSe/CdS/ZnS CQD film via spin-coating.
  • Wet-transfer of the CQD film onto the chirped quartz surface grating.

Main Results:

  • The CQD DFB laser exhibited single-mode lasing.
  • Lasing occurred at a threshold of approximately 400 μJ cm⁻².
  • The lasing wavelength was linearly dispersed from 613.4 nm to 623.2 nm over 5.6 mm, correlating with the grating pitch.

Conclusions:

  • The developed CQD DFB laser with a chirped grating successfully demonstrates tunable, spatially dispersed single-mode lasing.
  • The fabrication method integrating CQDs with chirped gratings is effective for creating advanced photonic devices.
  • This work paves the way for on-chip tunable light sources in integrated photonic circuits.