NDLI: Flexible distributed feedback colloidal quantum dot laser patterned by a submicron grating structure

Content Provider	IEEE Xplore Digital Library
Author	Yujie Chen Guilhabert, B. Herrnsdorf, J. Yanfeng Zhang Mackintosh, A.R. Pethrick, R.A. Laurand, N. Dawson, M.D.
Copyright Year	2011
Description	Author affiliation: Institute of Photonics, SUPA, University of Strathclyde, Glasgow G4 0NW, UK (Yujie Chen; Guilhabert, B.; Herrnsdorf, J.; Yanfeng Zhang; Laurand, N.; Dawson, M.D.) \|\| WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK (Mackintosh, A.R.; Pethrick, R.A.)
Abstract	Flexible optoelectronics is rapidly finding a niche for applications in areas such as flexible displays, sensors, solar cells and electronic paper, where low-cost, robustness, light weight and ease of fabrication are important advantages compared to their rigid-substrate counterparts [1]. We have been focusing on the study of flexible lasers using solution-based gain materials [2,3] and have developed a technique for replicating grating structures onto flexible substrates to form the basis of distributed-feedback (DFB) lasers. Colloidal quantum dots (CQDs) are attractive solution-based gain materials and are promising for laser devices due to their spectral tunability and temperature stability [4]. In this work, we report what we believe to be the first flexible DFB CQD laser. An exposed standard commercial blank digital versatile disk (DVD) was used as the mask to fabricate a submicron scale grating structure, providing a simple and low-cost approach. A UV transparent polymerisable host matrix, 1,4-cyclohexanedimethanol divinyl ether (CHDV), was then photo-cured to replicate the DVD grating structure and peeled off from the mask, resulting in a flexible grating [Fig. 1(a)]. The thickness of the grating substrate can be controlled in the range of 50 to 300 µm. The 740-nm period structure acts as a higher order (4th) diffraction grating for the CQD red emission and its 100-nm modulation depth yields sufficient feedback for laser oscillation [3]. Solution-based CdSe/ZnS core-shell CQDs were drop-coated onto it to form the gain layer of which thickness can be controlled via the coating process. A frequency-tripled Q-switched Nd:YAG laser (5-ns pulse, 10-Hz repetition rate and 355-nm excitation wavelength) was then used to photo-pump the CQD sample [Fig. 1(b)]. The emission evolution was investigated [Fig. 1(c)] and a 4 $mJ/cm^{2}$ lasing threshold was found, comparing favourably to other reports of CQD lasers [4]. The polarisation of the laser emission revealed that the DFB CQD laser favours a linearly polarized (TE) emission. During the experiment, the laser performance, operating above lasing threshold at room temperature and ambient atmosphere, was stable over more than 10,000 pump pulses.
Starting Page	1
Ending Page	1
File Size	370172
Page Count	1
File Format	PDF
ISBN	9781457705335
e-ISBN	9781457705328
DOI	10.1109/CLEOE.2011.5942584
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-05-22
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quantum dot lasers Laser excitation Gratings Pump lasers Substrates
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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