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.
A multiple quantum well (MQW) transistor vertical-cavity surface-emitting laser (T-VCSEL) is designed and numerically modeled. The important physical models and parameters are discussed and validated by modeling a conventional VCSEL and comparing the results with the experiment. The quantum capture/escape process is simulated using the quantum-trap model and shows a significant effect on the electrical...
We show that the interference between the slave laser output and the injected light that is reflected from the VCSEL facet can significantly improve the modulation frequency response of injection-locked VCSELs, both experimentally and numerically.
A multiple quantum well (MQW) transistor vertical-cavity surface-emitting laser (T-VCSEL) is designed and numerically modeled. The quantum capture/escape process is simulated using a quantum-trap model. Both the steady state and frequency response of the T-VCSEL are calculated by a numerical and analytical approach.
Transistor VCSELs with different base doping densities are numerically modelled. The effect of the base doping density on both optical and electrical properties, i.e., laser threshold, optical power, slope efficiency, and electrical gain, is investigated.
We demonstrate a method for the fabrication of suspended gratings in GaAs/AlGaAs. These gratings are designed to act as high reflectivity mirrors in vertical cavity lasers. The fabrication process used is simple, and with a high yield. Stiction or fracture due to surface tension as well as stiction of grating fingers to one another is circumvented. In particular, we found that in fabrication of freestanding...
Inaccurate feed modeling in the antenna design and analysis is one of the main sources errors in the Method of Moments (MoM) analysis. In this paper we present a new feed modeling for MoM with the well-known RWG basis functions [3]. The proposed model is a generalization of the well-known delta-gap voltage source adapted to patch antennas [1,2]. The RWG basis functions used in this paper — and widely...
With the advances in digital communication the need for ultra wideband antennas (UWB) has increased. UWB antennas also have applications in medical diagnostics [1,2] and radar systems [3,4]. Examples of UWB antennas include loaded dipoles [5], loaded bowties, conical antennas [6,7] and V slot antenna. The magnetic slot antenna has been shown to have ultra wideband properties [8], however its performance...
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.