Thanh Nam Tran | Ton Duc Thang University (original) (raw)
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Aluminum-based contacts could be a good alternative to conventional gold-based contacts for a num... more Aluminum-based contacts could be a good alternative to conventional gold-based contacts for a number of GaSb-based devices. In this study, the use of some Al-based contacts in GaSb-based diode lasers was investigated via the measurement of specific contact resistivity and laser output characteristics. The Al-based contacts to p-type GaSb(001) exhibited lower specific contact resistivities than the conventional Au-based contacts, whereas the opposite was the case for contacts to n-type GaSb(001). The good performance of GaSb-based laser diodes using Al-based contacts shows the applicability of this type of contact in GaSb-based devices. The contact between Al only and p-type GaSb(001), however, could suffer from a reliability problem when used in diode lasers, due to interdiffusion, in which case a diffusion barrier should be included.
We demonstrate how resonant excitation of a microelectro-mechanical system can be used to increas... more We demonstrate how resonant excitation of a microelectro-mechanical system can be used to increase the tuning range of a vertical-cavity surface-emitting laser two-fold by enabling both blue-and red-shifting of the wavelength. In this way a short-cavity design enabling wide tuning range can be realized. A high-index-contrast subwavelength grating verticalcavity surface-emitting laser with a monolithically integrated anti-reflection coating is presented. By incorporating an antireflection coating into the air cavity, higher tuning efficiency can be achieved at low threshold current. The first result shows 24-nm continuous resonant tuning range around an emission wavelength of 1060 nm with 0.9 mW output power. Thor Ansbaek was born in Copenhagen, Denmark, in 1984. He received his M.Sc. Eng. degree in 2008 and Ph.D. degree in 2012 both at The Technical University of Denmark (DTU). His research topics include semiconductor fabrication, microelectromechanical systems (MEMS) and vertical-cavity surfaceemitting lasers (VCSELs) for medical diagnosis.
Aluminum-based contacts could be a good alternative to conventional gold-based contacts for a num... more Aluminum-based contacts could be a good alternative to conventional gold-based contacts for a number of GaSb-based devices. In this study, the use of some Al-based contacts in GaSb-based diode lasers was investigated via the measurement of specific contact resistivity and laser output characteristics. The Al-based contacts to p-type GaSb(001) exhibited lower specific contact resistivities than the conventional Au-based contacts, whereas the opposite was the case for contacts to n-type GaSb(001). The good performance of GaSb-based laser diodes using Al-based contacts shows the applicability of this type of contact in GaSb-based devices. The contact between Al only and p-type GaSb(001), however, could suffer from a reliability problem when used in diode lasers, due to interdiffusion, in which case a diffusion barrier should be included.
We demonstrate how resonant excitation of a microelectro-mechanical system can be used to increas... more We demonstrate how resonant excitation of a microelectro-mechanical system can be used to increase the tuning range of a vertical-cavity surface-emitting laser two-fold by enabling both blue-and red-shifting of the wavelength. In this way a short-cavity design enabling wide tuning range can be realized. A high-index-contrast subwavelength grating verticalcavity surface-emitting laser with a monolithically integrated anti-reflection coating is presented. By incorporating an antireflection coating into the air cavity, higher tuning efficiency can be achieved at low threshold current. The first result shows 24-nm continuous resonant tuning range around an emission wavelength of 1060 nm with 0.9 mW output power. Thor Ansbaek was born in Copenhagen, Denmark, in 1984. He received his M.Sc. Eng. degree in 2008 and Ph.D. degree in 2012 both at The Technical University of Denmark (DTU). His research topics include semiconductor fabrication, microelectromechanical systems (MEMS) and vertical-cavity surfaceemitting lasers (VCSELs) for medical diagnosis.