New Materials
For
Optoelectronics
webnemo.uniroma2.it
Development, fabrication and
characterization
of MATERIALS and SYSTEMS
for applications in
1. Optics
2. Integrated optics
3. Optoelectronics
4. Energy
5. Sensors
Main activities
• 3D self assembly and photonic crystals
• Nanoimprinting and Soft Lithography
• 3D printing for medical applications
• Optical sensors
3D self assembly and photonic crystals
Self-assembly
Polystiren Photonic crystal
4
3D self assembly and photonic crystals
Reflectance spectra of
self-assembled PC
3D self assembly and photonic crystals
Luminescence of Dye doped PSRB photonic crystal at 32° for
increasing excitation power
Normalized peak intensity and
width as a function of excitation
power
3D self assembly and photonic crystals
Micro- and nano-ribbon (both
doped and undoped)
7
Nanoimprinting and Soft Lithography
PDMS mold fabrication
master
mold
mold
replica
Nanoimprinting and Soft Lithography
Laser Interference Lithography
In Lloyd Mirror configuration
Photo Sol-Gel
Ar Laser (UV)
Mirror
Lloyd mirror
m  2 sin 
Nanoimprinting and Soft Lithography
Laser Interference Lithography
In Lloyd Mirror configuration
Nanoimprinting and Soft Lithography
Applications:
Optimization of light
harvesting for solar cells
Nanoimprinting and Soft Lithography
Applications:
Bioinspired anti-reflection coatings
Campione C
0.20
20° C
40° C
60° C
20° BK7
40° BK7
60° BK7
Riflettanza
0.15
0.10
0.05
0.00
300
600
900
1200
Lunghezza d'onda (nm)
1500
1800
3D printing for medical applications
3D printing for medical applications
Two-photon scaffold
photopolymerization
3D printing for medical applications
Optical sensors
Optical chemical vapor
sensors based on
semiconductor Quantum
Dots (InP)
PL intensity (a.u.)
1.2
0.8
0.4
0.0
700
750
800
850
Wavelength (nm)
900
Optical sensors
PL intensity (arb. un.)
28900 ppm
0.8
24800 ppm
20500 ppm
0.6
16400 ppm
0.4
12200 ppm
7900 ppm
0.2
5900 ppm
4600 ppm
0.0
0
2000
4000
6000
8000
10000
time (s)
12000
14000
16000
18000
Fabrication and Characterization facilities
-
Absorption, transmission, reflection, luminescence (down to 15 K)
Absolute luminescence Quantum efficiency
Ellipsometry
Optcal waveguide characterization
Elettroluminesce
Photolithografy, laser interference lithography and soft-lithography
Spin and dip coating
Optical chemical sensing
Nanoindenter
Clean room
Staff:
Prof. Mauro Casalboni
Prof. Roberto Francini
Dr. Paolo Prosposito
Dr. Fabio De Matteis
Dr. Roberta De Angelis
and students
webnemo.uniroma2.it
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