Re: [eecs-announce] Dissertation Talk: Fabrication of Scalable and Electrically Injected Photonic Crystal Surface-Emitting Lasers

[Leyla Kabuli]

Our wonderful long-time Photobears Treasurer Emma is giving her dissertation talk on Monday at 3:30pm! Please RSVP here for headcount for post-talk treats!

On Thu, Dec 4, 2025 at 12:00 PM Emma Scott Martin <eecs-a...@lists.eecs.berkeley.edu> wrote:

Title: Fabrication of Scalable and Electrically Injected Photonic Crystal Surface-Emitting Lasers

Speaker: Emma Martin

Advisor: Boubacar Kanté

Date: Monday, December 8, 2025

Time: 3:30 - 4:30 PM PST

This is a hybrid event held in person and virtually over Zoom.
Location (In-person): 293 Cory Hall

Location (Zoom): https://berkeley.zoom.us/j/93906610192

Abstract: 

Semiconductor optoelectronic devices such as LEDs, solar cells, and lasers play a fundamental role in our information technology era and are poised to revolutionize applications ranging from displays, energy-efficient high-speed communications, and artificial intelligence hardware. Photonic crystal surface-emitting lasers (PCSELs) exhibit distinct advantages over more conventional semiconductor lasers of similar footprint, including higher output power and superior beam quality. However, conventional approaches to controlling light with electrical signals constrain symmetry, reduce refractive index contrast, and increase the complexity and footprint of such devices.

First, I will present the fabrication process of a scale-invariant laser, known as the Berkeley Surface Emitting Laser (BerkSEL), which allows for single-mode operation from the laser cavity without compromising device size or output power. Next, I will present a monolithic design and fabrication technique that enables the electrical activation of a PCSEL cavity without compromising optical confinement and symmetry constraints. This scheme establishes a new paradigm for minimally invasive, nano-scale electrical control of photonic states.

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