Quantum Dots II:Optical Transitions

20.04.2011

Matthew Rakher

QD II:

• Photoluminescence (PL) Spectroscopy

– Experimental Setup

– Ensemble PL

– Micro PL

• Time-resolved measurements

• Gated Devices

Simple Experimental Setup

UCSB PL Setup

NIST PL Setup

NIST Nanophotonics Characterization Lab, Summer 2009

NIST Free-Space PL Setup

Ensemble PL

s

p

d

How to see single QDs?

Density Gradient

Single QD Spectroscopy

X+

X0

X-

X-2 XX ?

QD Fine Structure

Full Numerical Models

Time-resolved Measurements

QD emission

Quantum Cascade

More than an Atom

By embedding the QD in a diode

structure, we can manipulate our atom in

novel ways depending on the structure:

More than an Atom

By embedding the QD in a diode

structure, we can manipulate our atom in

novel ways depending on the structure:

1. Electrical Excitation

1.

More than an Atom

By embedding the QD in a diode

structure, we can manipulate our atom in

novel ways depending on the structure:

1. Electrical Excitation

2. Single Carrier Loading

X+

Xo

X-

X-2

X-3

1. 2.

More than an Atom

By embedding the QD in a diode

structure, we can manipulate our atom in

novel ways depending on the structure:

1. Electrical Excitation

2. Single Carrier Loading

3. Stark Shift Spectral Tuning

X+

Xo

X-

X-2

X-3

1. 2. 3.