10.1 Outline of the course - KIT - LTI · Outline of the course 1. Introduction 2. Optoelectronic...
Transcript of 10.1 Outline of the course - KIT - LTI · Outline of the course 1. Introduction 2. Optoelectronic...
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.1
Outline of the course
1. Introduction
2. Optoelectronic properties of organic semiconductors
3. Organic light emitting diodes (OLEDs)
4. Device and display production
5. Organic FETs
6. Organic photodetectors and solar cells
7. Lasers and integrated optics
7.1 Organic laser basics
7.2 Organic semiconductor laser
7.3 Distributed feedback laser
7.4 Lab-on-chip-systems
7.4.1 Waveguide coupled lasers
7.3.2 Fast photodetectors
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.2
What means LASER ?
LightAmplification by
StimulatedEmission ofRadiation
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.3
Laser History
1958: Theoretical prediction (Schawlow, Townes et al., Bell-Labs)
1960: First experimental realization: Ruby laser (Al2O3 mit Cr)(Maiman et al., Hughes Research)
1961: First continuous wave laser (HeNe)
1962: First semiconductor diode laser (GaAs)
1966: First organic dye laser
1996: First organic semiconductor laser
2000: First organic laser diode (Bell-Labs) „The Schön-Scandal“
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.4
| 1>
| 2>Laser beam
Laser principle: Optical amplification and positive feedback
Mirror Mirror
Pump
Active material
LASING
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.5
Some basics ... Optical amplification
| 1>
| 2>
ActiveMedium Absorption (|1> →|2>) ~N1Wn
Stim. Emission (|2> →|1>) ~N2Wn
Spon. Emission (|2> →|1>) ~N2W
Lower state population: N1
Upper state population: N2
Photon number: nTransition rate: W
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.6
Why lasing with organic materials ?
Abs.Emiss.
highly allowed absorption and emission (high W)
spectral separation of absorption and emission ⇒ 4 level-system( N1≈0, ⇒ low laser threshold, highly tunable)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.7
Organic dye lasers
History:
1966: Sorokin and Lankard (IBM Yorktown Heights)chloro-aluminum-phthalcyanine-dyeIBM J. Res. Develop. 10, 162 (1966)
1966 F. Schäfer et al. (University of Marburg)various cyanine dyes
Appl. Phys. Lett. 9, 306 (1966)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.8
Outline of the course
1. Introduction
2. Optoelectronic properties of organic semiconductors
3. Organic light emitting diodes (OLEDs)
4. Device and display production
5. Organic FETs
6. Organic photodetectors and solar cells
7. Lasers and integrated optics
7.1 Organic laser basics
7.2 Organic semiconductor laser
7.3 Distributed feedback laser
7.4 Lab-on-chip-systems
7.4.1 Waveguide coupled lasers
7.3.2 Fast photodetectors
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.9
Towards organic solid state lasers: dyes in a polymer matrix
•0.8% rhodamine 6G in polyurethane,
•thickness 800 nm on a glass rod
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.10
Towards organic solid state lasers: molecular crystals
1972: Optically pumped anthracene laserN. Karl, Phys. Stat. Sol. (a) 13, 651(1972)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.11
fs pump-probe to test optical gain
Simultaneous detection of ∆T/T and emisson
pump-pulse
white lightprobe-pulse
detection
∆t
Spectrograph
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.12
a)
A
bs.(
a.u
)
PL
(a. u
.)b)
350 400 450 500 550 600
0
2000 c)
Wavelength (nm)
Ga
in (
cm
-1)
Optical spectra of m-LPPP: Abs., PL, Gain(0 ps)
t = 0 psS0
S1
Ab
sorp
tio
n
T. Pauck, U. L. et al., CPL 244, 171 (1995). A. Haugeneder, U. L. et al., JAP 85, 1124 (1999).
R
R
R'
R' nx
x
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.13
The first conjugated polymer laser
Tessler et al. Nature 382, 695 (1996)
Threshold pulse energy: ≈ µJ
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.14
Outline of the course
1. Introduction
2. Optoelectronic properties of organic semiconductors
3. Organic light emitting diodes (OLEDs)
4. Device and display production
5. Organic FETs
6. Organic photodetectors and solar cells
7. Lasers and integrated optics
7.1 Organic laser basics
7.2 Organic semiconductor laser
7.3 Distributed feedback laser
7.4 Lab-on-chip-systems
7.4.1 Waveguide coupled lasers
7.3.2 Fast photodetectors
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Universität Karlsruhe (TH)Research University � founded 1825
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Uli Lemmer
10.15
a) b)
c)
d) e) f)
Organic semiconductor laser resonators
U. Lemmer et al., Phys. Bl. 56, 25 (2000)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.16
Organic DFB laser
substrate
organic material
Λ⋅⋅= effBragg nm
2λ
2nd ordersubstrate
organicmaterial
Λ
m: order
neff: effective refractive index
Λ: periodicity
1st order
Λ
Advantages
• monochromatic light source• wide spectral range and tunability• low pumping thresholds• wide range of fabrication processes on
different substrates
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
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Uli Lemmer
10.17
425 450 475 500 525 550
FWHM < 0.3 nm
EP = 2,0 nJ
Inte
nsit
y(a
rb. U
nit
s)
Wavelength (nm)
EP = 1,3 nJ
EP= 1,1 nJ
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,50
100
200
300
1D-DFB
2D-photonic crystal laser
Excitation Energy (nJ / pulse)
Ou
tpu
t P
ow
er (n
orm
alized)
– Lower laser threshold
– Increased efficiency
S. Riechel, U.L. et al., APL 77, 2311 (2000)
2D Photonic Crystal Laser
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.18
Variation of the grating periodicity
130 nm tuning range
Alq3:DCM
600 625 650 675 700 7250.00
0.25
0.50
0.75
1.00
0.0
2.5
5.0
7.5
10.0
12.5
Norm
aliz
ed
In
tensity
Wavelength / nm
Thre
shold
/ µ
J/c
m²
360 380 400 420 440 460
600
620
640
660
680
700
720
740
Wa
ve
len
gth
/ n
mGrating period / nm
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.19
Variation of the active material
300 350 400 450 500 550 600 6500,0
0,2
0,4
0,6
0,8
1,0
norm
iert
e I
nte
nsität
Wellenlänge in nm
Pump-
laser
300 350 400 450 500 550 600 6500,0
0,2
0,4
0,6
0,8
1,0
no
mie
rte
Em
issio
n/A
bso
rptio
n
Wellenlänge in nm
Ab
so
rpti
on
Spiro-6-φdotiert mit
DPVABdotiert mit
DCM
Pump wavelength: 355 nm
Laser wavelength: 420 nm - 650 nm
⇒∆λ = 230 nm
Wavelength / nm
rela
tive f
loure
scence
inte
nsity
/ arb
. u.
Wavelength / nm
M. Stroisch et al.
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
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Uli Lemmer
10.20
Resonators
C. Karnutsch, U.L. et al., Appl. Phys. Lett. 89, 201108 (2006) C. Karnutsch, U.L. et al., Appl. Phys. Lett. 90, 131104 (2007)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.21
Laser diode pumping
400 450 500 550 600 650 700
0.0
0.2
0.4
0.6
0.8
1.0
Inte
nsity /
arb
.u.
Wavelength /nm
Single low-cost GaN laser diode for pumping lasers
Parameters
λPump = 406 nm
τPump = 20 nsfRep = 16 Hz
C. Karnutsch, M. Punke et al., IEEE Photon. Technol. Lett., 19, 741 (2007)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
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Uli Lemmer
10.22
J. H. Schön, C. Kloc, A. Dodabalapur, B. Batlogg, Science 289, 5999 (2000).
Ith= 500 A/cm2
λ=575 nmcw op. up to 77 Kpulsed @ 300 K
t
The first organic laser diode (unfortunately not) or “The Jan Hendrik Schön scandal”
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.23
Optical model Electronic model
Design rules for an organic laser diode
Active layer
Cladding
CladdingEL
ETL
HTL
Critical:
- Waveguide losses
Critical:
- Annihilation processes
- Polaronabsorption
C. Pflumm, U. L. et al., IEEE JQE. 41, 316 (2005)C. Gärtner, C. Karnutsch, C. Pflumm, U. Lemmer,Journ. of Appl. Phys. 101, 023107 (2007).
Why is an organic laser diode so difficult ?
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.24
Outline of the course
1. Introduction
2. Optoelectronic properties of organic semiconductors
3. Organic light emitting diodes (OLEDs)
4. Device and display production
5. Organic FETs
6. Organic photodetectors and solar cells
7. Lasers and integrated optics
7.1 Organic laser basics
7.2 Organic semiconductor laser
7.3 Distributed feedback laser
7.4 Lab-on-chip-systems
7.4.1 Waveguide coupled lasers
7.3.2 Fast photodetectors
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
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Uli Lemmer
10.25Motivation: Lab-on-a-chip systems
Organic DFB
lasers
GaN laser diode
Waveguides Microfluidic
system
Organic
photodiode
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.26
Si master electro-plating Ni stamp
imprinting imprinted substrate vapor deposition
Thermal and UV- Nanoimprint
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.27
DUV modification of PMMA
resonator structure DUV modification
Parameter
power / wavelength: 5 J @ 240 nm
refractive index change: 0.008
(1.4797 � 1.4847 @ 633 nm)
waveguide depth: ~ 5 µm
waveguide width: 3-50 µm
D. Rabus et al., IEEE Photon. Technol. Lett. 7, 591, (2005)
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Universität Karlsruhe (TH)Research University � founded 1825
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Uli Lemmer
10.28
Integration: Laser and waveguides
DUV modificationimprint thin-film deposition waveguide-coupled
laser
completed sample
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
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Uli Lemmer
10.29
Optical characterization
M. Punke, U.L. et al. IEEE Phot. Tech. Lett. 19, 61 (2007)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
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Uli Lemmer
10.30
Waveguide-coupled lasing
laser + waveguide
600 610 620 630 640 650 660
FWHM = 0.4 nm
Inte
nsity / a
rb.u
.
Wavelength / nm
Pump parameter
excitation wavelength: 355 nm
pulse length: 1.65 ns
pump spot size: ~ 150x150 µm
Laser / waveguide parameter
laser wavelength: 643 nm
waveguide width: 50 µm
coupled peak power: ~ 3.2 µW
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.31Direct two-photon laser writing
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.32Direct two-photon laser writing
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
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Uli Lemmer
10.33Direct two-photon laser writing in SU 8
d=220 nm (600 nm in z-direction)d=320 nm (1,6 µm in z-direction)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
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Uli Lemmer
10.34Waveguide AND DFB resonator by Direct TP-laser Writing
Direct laser writing works for nano- AND microstructures
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.35DFB-resonators by Direct TP-laser Writing
Alq3:DCM
50 0 550 600 650 700 750E
mis
sio
n In
ten
sity / a
rb. u
.E m iss ion W ave leng th / nm
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.36Motivation: Lab-on-a-chip systems
Organic DFB
lasers
GaN laser diode
Waveguides Microfluidic
system
Organic
photodiode
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.37
Outline of the course
1. Introduction
2. Optoelectronic properties of organic semiconductors
3. Organic light emitting diodes (OLEDs)
4. Device and display production
5. Organic FETs
6. Organic photodetectors and solar cells
7. Lasers and integrated optics
7.1 Organic laser basics
7.2 Organic semiconductor laser
7.3 Distributed feedback laser
7.4 Lab-on-chip-systems
7.4.1 Waveguide coupled lasers
7.3.2 Fast photodetectors
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.38
Getting faster: Layout for reduced C
• Active area is defined by photolithographic proceduresusing SU-8 as insulator
• Capacitor is formed (with SU-8 as dielectric) �SU-8-layer has to be as thick as possible
Contact pin Contact pin
Al cathode
Active material
Hole transport layer
SU-8
ITO anode
Glass substrate
Activearea
Structure
ITO Anode (125 nm)
P3HT:PCBM (300 nm)
Al Kathode (100 nm)
Pedot:PSS (40 nm)
Substrat
M. Punke, U.L. et al., Appl. Phys. Lett. 91, 071118 (2007)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.39
Results: Carrier sweep out in OPDs
Photoresponse vs. Bias voltage
�FWHM < 15ns
�Rise times < 2ns
�Fall times < 10 ns
(at -5V bias voltage)
-assuming the fall time is sweep out limited the mobility is estimated to 1⋅10-3cm2/Vs-the buildup of space charges has to be taken into accout
M. Punke, U.L. et al., Appl. Phys. Lett. 91, 071118 (2007).
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.40
Optical interconnects
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.41
Optical interconnect: results
Alq3-High Frequency-OLED
Eyediagram of an all-organicdata transmission (S/PDIF)
�Data rate: 2.8 Mbit/s
�Min. pulse length: 165 ns P3HT/PCBM-High Frequency-OPD
M. Punke, U. L. et al., Journ. of Lightw. Tech. 26, 816 (2008)
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Universität Karlsruhe (TH)Research University � founded 1825
Universität Karlsruhe (TH)
Lichttechnisches Institut
Uli Lemmer
10.42Laser direct writing of an SU8 Ridge Waveguide
Ridge waveguide
5µm x 5µm
TIR mirror at end facet