The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Index confinement is studied experimentally and through modelling for lithographic vertical-cavity surface-emitting lasers (VCSELs) and contrasted with other types of VCSELs. Modelling shows that the index confinement is set by the height of a shallow internal mesa that produces the optical mode confinement. Overgrowth with a semiconductor mirror enables a range of index confinement from zero (no...
Data are presented on 901 nm lithographic vertical-cavity surface-emitting lasers (VCSELs) demonstrating high efficiency for small VCSEL sizes, and stable beam patterns. Power conversion efficiency >40% is obtained for VCSELs ranging in size from 6 to 2 µm diameter. The 2 µm diameter VCSELs produce output powers in excess of 6.5 mW, and produce single-lobed far-field radiation patterns over the...
Data are presented demonstrating, to our knowledge, the first monolithic chip integrating a semiconductor laser with a spontaneous light emitting diode optical pump that can also act as a heat pump. The light emitting diode operates in the voltage bias regime needed to generate a thermoelectrophotonic heat absorption. Under ideal operation the light emitting diode can efficiently optically pump the...
Summary form only given. Self-organized quantum dots (QDs) offer unique opportunities to realize new types of semiconductor lasers and spontaneous light sources. One of the more interesting and potentially important is their use in microcavities. In this paper the authors describe experimental data based on incorporating self-organized QDs in a new type of all-epitaxial microcavity that can form a...
Summary form only given. We present a process that seals an exposed AlAs layer against further oxidative decomposition. The sealant is formed by a rapid thermal anneal (RTA) to a temperature of /spl sim/500 to 600/spl deg/C in forming gas after brief exposure of the AlAs surface to the typical room environment. The surface barrier layer thus formed is thin and impermeable to diffusing oxygen species,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.