Nano-silver microcavity enhanced UV GaN light emitter. (8th September 2009)

• Record Type: Journal Article
• Authors: Ahmed, N.M.; Sauli, Zaliman; Hashim, Uda; Zahid Jamal, Zul Azhar
• Is Part Of: International journal of nanomanufacturing. Volume 4:Number 1/2/3/4(2009)
• Page Start: 26
• Page End: 33
• Publication Date: 2009-09-08
• Subjects: GaN -- gallium nitride -- photoluminescence -- nanosilver -- plasmon frequency -- microcavities -- ultraviolet -- silver metal reflectors -- nanomanufacturing -- nanotechnology; Nanostructured materials industry -- Periodicals; Nanotechnology -- Periodicals; 620.505
• Languages: English
• ISSNs: 1746-9392

Abstract

We report results of measurements that help to clarify the role of silver in the reflection of UV emission light from GaN. A GaN as an active layer was sandwiched between two silver metal reflectors. GaN layer on sapphire showed a photoluminescence (PL) peak around 364 nm and its full width half maximum was about 6.7 nm. Two types of microcavity, were fabricated: half-cavity GaN/sapphire/silver and full-cavity silver/GaN/sapphire/silver. Photoluminescence measurements showed a two-fold intensity enhancement in half-cavity back mirror. In the full cavity samples, the amplitude of the photoluminescence is enhanced ten times when we used 50 nm silver as a front mirror. A tremendous more than 16-fold enhancement is obtained when silver mirror of 25 nm was used as a front mirror. The increase in the photoluminescence intensity is explained in terms of competition between increasing absorption in the cavity, silver surface plasmon coupling and increasing optical field-enhancement due to resonator.