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Issue 48, 2018
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Tunable colloidal quantum dot distributed feedback lasers integrated on a continuously chirped surface grating

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Abstract

We report a colloidal quantum dot (CQD) distributed feedback (DFB) laser structure containing a chirped grating. The device exhibits single-mode DFB lasing, of which the wavelength is spatially dispersed in a single chip. A period-chirped surface grating is fabricated using a modified Lloyd-type laser interference lithography setup, where a flat Lloyd's mirror is replaced with a concave one. A dense red-emitting CdSe/CdS/ZnS CQD film is prepared on a temporary substrate by spin-coating, which is subsequently released and wet-transferred onto a period-chirped quartz surface grating. Upon optical excitation, the fabricated DFB laser device lases in a single mode at a laser threshold of ∼400 μJ cm−2, with its lasing wavelength shifted linearly (in proportion to the grating pitch) along the chirp direction from 613.4 nm to 623.2 nm over a distance of ∼5.6 mm.

Graphical abstract: Tunable colloidal quantum dot distributed feedback lasers integrated on a continuously chirped surface grating

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Publication details

The article was received on 27 Sep 2018, accepted on 20 Nov 2018 and first published on 21 Nov 2018


Article type: Communication
DOI: 10.1039/C8NR07854H
Citation: Nanoscale, 2018,10, 22745-22749
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    Tunable colloidal quantum dot distributed feedback lasers integrated on a continuously chirped surface grating

    H. Jung, C. Han, H. Kim, K. Cho, Y. Roh, Y. Park and H. Jeon, Nanoscale, 2018, 10, 22745
    DOI: 10.1039/C8NR07854H

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