期刊
APPLIED PHYSICS LETTERS
卷 107, 期 9, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4929944
关键词
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资金
- King Abdulaziz City for Science and Technology (KACST) Technology Innovations Center (TIC) program
- Solid State Lighting and Energy Electronics Center (SSLEEC) at the University of California, Santa Barbara (UCSB)
- King Abdullah University of Science and Technology (KAUST)
- NSF MRSEC program [DMR-1121053]
We report on a III-nitride vertical-cavity surface-emitting laser (VCSEL) with a III-nitride tunnel junction (TJ) intracavity contact. The violet nonpolar VCSEL employing the TJ is compared to an equivalent VCSEL with a tin-doped indium oxide (ITO) intracavity contact. The TJ VCSEL shows a threshold current density (J(th)) of similar to 3.5 kA/cm(2), compared to the ITO VCSEL J(th) of 8 kA/cm(2). The differential efficiency of the TJ VCSEL is also observed to be significantly higher than that of the ITO VCSEL, reaching a peak power of similar to 550 mu W, compared to similar to 80 mu W for the ITO VCSEL. Both VCSELs display filamentary lasing in the current aperture, which we believe to be predominantly a result of local variations in contact resistance, which may induce local variations in refractive index and free carrier absorption. Beyond the analyses of the lasing characteristics, we discuss the molecular-beam epitaxy (MBE) regrowth of the TJ, as well as its unexpected performance based on band-diagram simulations. Furthermore, we investigate the intrinsic advantages of using a TJ intracavity contact in a VCSEL using a 1D mode profile analysis to approximate the threshold modal gain and general loss contributions in the TJ and ITO VCSEL. (C) 2015 AIP Publishing LLC.
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