Ultrahigh Quality Microlasers from Controlled Self‐Assembly of Ultrathin Colloidal Semiconductor Quantum Wells

Author:

Thung Yi Tian12,Duan Rui1,Durmusoglu Emek G.12ORCID,He Yichen3,Xiao Lian1,Lee Calvin Xiu Xian1ORCID,Lew Wen Siang1ORCID,Zhang Lin3,Demir Hilmi Volkan1245ORCID,Sun Handong1ORCID

Affiliation:

1. Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

2. LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays The Photonics Institute School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore

3. School of Precision Instruments and Optoelectronics Engineering Tianjin University Tianjin 300072 China

4. School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore

5. Department of Electrical and Electronics Engineering Department of Physics UNAM—Institute of Materials Science and Nanotechnology Bilkent University Ankara 06800 Turkey

Abstract

AbstractColloidal quantum wells (CQWs) have emerged as a promising class of gain material in various optical feedback configurations. This is due to their unique excitonic features arising from their 1D quantum confinement. However, existing methods for integrating CQW onto microresonators will cause low laser quality due to uneven CQW coating. To overcome this, the use of liquid‐interface kinetically driven self‐assembly is proposed to coat ultrathin, close‐packed layers of colloidal CdSe/Cd1−xZnxS core/shell CQWs between 7 and 14 nm onto the surface of silica microsphere cavities. The fabricated CQW‐whispering‐gallery‐mode microlasers possess a commendable high quality (Q) factor of 13 000 at room temperature. Stable single‐mode lasing output is demonstrated through evanescent field coupling between a CQW‐coated microsphere and a thin uncoated microfiber in a 2D‐3D microcavity configuration. These promising results highlight the suitability of the liquid‐interface kinetically driven self‐assembly method for realizing ultrathin CQW‐coated microlasers and its high compatibility for integrating colloidal nanocrystals onto complex 3D microstructures for future miniaturized colloidal optoelectronic and photonic applications.

Funder

National Research Foundation Singapore

Publisher

Wiley

Subject

Condensed Matter Physics,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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