Dr. Pierre M. Bouzi Profile

Dr. Pierre M. Bouzi

Graduate Student at Princeton Univ

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account

PROCEEDINGS ARTICLE | April 20, 2017

The effects of interface roughness on quantum cascade lasers (Conference Presentation)

Proc. SPIE. 10123, Novel In-Plane Semiconductor Lasers XVI

KEYWORDS: Quantum wells, Scattering, Electrons, Interfaces, Laser processing, Laser development, Laser scattering, Quantum cascade lasers, Electroluminescence, Phonons

Read Abstract

Quantum cascade (QC) lasers achieve population inversion by selecting quantum wells (QW) thicknesses so that the inherent scattering mechanisms ensure a higher population of electrons in the upper laser state compared to the lower laser state. Previously, longitudinal optical (LO) phonons have been considered the fastest, most significant scattering process in QC lasers. Recently, it has been shown that interface roughness (IFR) can have substantial effects in determining the effective lifetimes within QW systems [1]. Simulations have shown that IFR scattering lifetimes can be the dominant scattering process for selected QW configurations [2]. Here we have designed and fabricated three QC structures, which differ in the positioning of a strategically placed monolayer barrier to selectively affect the IFR scattering lifetimes of the energy levels in the QC structures. Initial current-voltage characteristics suggest a shorter carrier transit time through the QC structure due to increased interface roughness interactions. We also observed an expected narrowing of the EL spectra based on these same interactions. Using these results, we have also designed a QC laser using IFR scattering as the determining process for maintaining population inversion. By using IFR scattering, we were able to design an energy separation between the lower laser level and subsequent injector levels much greater than the LO phonon energy without compromising fast carrier depopulation from the lower laser level. This in effect opens doors for completely new intersubband design techniques. This work is supported in part by MIRTHE (NSF-ERC).

PROCEEDINGS ARTICLE | March 4, 2013

Transverse mode control in quantum cascade lasers via lossy lateral constrictions

Proc. SPIE. 8640, Novel In-Plane Semiconductor Lasers XII

KEYWORDS: Refractive index, Beam steering, Etching, Metals, Quantum cascade lasers, Platinum, Semiconductor lasers, Scanning electron microscopy, Optical simulations, Radio propagation

Read Abstract

Quantum Cascade (QC) lasers are semiconductor devices operating in the mid-infrared and terahertz regions of the electromagnetic spectrum. Since their first demonstration in 1994, they have evolved rapidly into high power devices. However, they also have intrinsic challenges, such as beam steering at high power. Such phenomenon has been observed in QC lasers and attributed to the interaction between the two lowest transverse modes in the laser cavity.

In this project, we have used COMSOL Multiphysics simulations to first investigate how transverse mode propagation can be controlled with cavity spoilers. We have modeled this effect by creating short and lossy lateral constrictions from the top of the laser ridge to perturb the modes distributed more toward the sides of the laser ridge, while leaving the fundamental mode intact. After obtaining optimized dimensions for the constrictions, we have utilized focused ion beam (FIB) milling to etch two small trenches from the top of several laser ridges to create the simulated effect on our devices. We, then, filled them with platinum in an effort to completely suppress the propagation of higher order transverse modes in the cavity. The results obtained show minimal effect on threshold and a Gaussian far-field distribution at various current levels, indicating a complete suppression of the higher order transverse modes.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to SPIE eBooks is limited to subscribing institutions. Access is not available as part of an individual subscription.

Purchase complete book on SPIE.org.

Shibboleth users login to see if you have access.

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $0.00

Non-members: $0.00 ADD TO CART

Keywords/Phrases

Search In:

Publication Years