Terahertz LIFE - Agenda (Indico) · Coherent THz emission in a FEL machine ... Frequency-resolved...
Transcript of Terahertz LIFE - Agenda (Indico) · Coherent THz emission in a FEL machine ... Frequency-resolved...
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Terahertz LIFE
A proposal for a THz beamline at SPARC
1S. Lupi, 1A. Nucara, 1D. Nicoletti, 1P. Calvani
2M. Ortolani,
3A. Perucchi1INFN and Department of Physics,University of Rome La Sapienza,
2IFN-CNR
3SISSI@ELETTRA
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Outline
THz gap
Coherent THz emission in a FEL machine
Scientific opportunities for linear and non-linearTHz spectroscopy;
THz@SPARC
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The Terahertz gap0.1 THz – 10 THz
No electronics, fewmicrowaves generators
Vanishing thermalpower, few tunable and
pulsed lasers.
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Coherent Synchrotron Radiation (CSR)
Low-α mode IRIS@Bessy-II: U. Schade et al, PRL 2003
SISSI@Elettra: E. Karanzoulis, A. Perucchi, S.L et al, ,2007
low-e beam energy
€
I = Iincoh + Icoh= (N (1− fv ) + N 2 fν )Iincoh
€
fv = n(z)eiπ cos(θ)z dz∫2
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Transition THz Radiation (CDR/CTR)
Transition Radiation occurs when an electroncrosses the boundary between two different media
Intensity is 0 on axis and peaked at Θ∼1/γPolarization is radial
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Figures of Merit of THz sources:energy/pulse
A. Perucchi et al, 2007
SPARX
SPARC
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Figures of Merit of THz sources:peak power
A. Perucchi et al, 2007
SPARX
SPARC
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Figures of Merit of THz sources:average power
A. Perucchi et al, 2007
QCL
SPARC
SPARX
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THz Science
SuperconductivityEnergy gapSymmetry of the order parameterDirect determination of the superfluid densityDynamics of Cooper pairs
Low-dimensional materials
Dimensionality crossoverNon-Fermi liquid normal statesBroken symmetry ground states
Coherent Phase TransitionsPolaronsStructural Phase Transitions
Magnetic sub-ps Dynamics
Condensed Matter PhysicsLife Sciences
Macromolecules conformation Secondary and tertiary structure Coherent dynamic development
Imaging 3D tomography of dry tissues Near-field sub-wavelenght spatial resolution
Polar liquids Hydrogen bond Van der Waals interactions Acoustic-Optic phonon mixing in waterSolutions Static and dynamic interactions between solvated ions and solvent
Physical and Analytical Chemistry
New TechnologiesTHz technologiesArray THz detectorsMetamaterialsMedical diagnostic Skin cancer detectionIndustrial production Material inspection Production line monitoringDefense industry/Homeland security Detection of explosives and biohazards
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THz Pump- THz Probe non-linear time-domainexperiments
(THz Pump and IR+VIS Probes using IR+VIS emissions)High Energy/Pulse
THz Experiments
Frequency-Domain Spectroscopy Average Energy (Power)
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Basic optics of SuperconductorsSuperconducting gap observed if:-sample in the dirty-limit (2Δ < Γ)
-Cooper pairs in s-wave symmetry40x103
30
20
10
0
σ1(ω
) (Ω
−1cm
-1)
200150100500
ω (cm-1)
Normal State T = 0.9 Tc T = 0.6 Tc T = 0
Superconducting Gap
σ1sup (ω ) = ω
2ps
8δ (ω )+σ1
reg(ω )
1.000
0.995
0.990
0.985
0.980
Ref
lect
ance
100806040200 ω (cm-1)
Normal State T = 0.9 Tc T = 0.6 Tc T = 0
2Δ
Drude absorption
Drude reflectance Γ
2Δ
Minimum excitation energy:Cooper-pair breaking 2Δ
ω ≤ Γ (T) : Rn (ω) = 1 - [8ωΓ(T)/ ωp2]1/2 ω ≤ 2Δ(T) : Rs(ω) = 1
Peak at 2Δ in Rs/Rn
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Frequency Domain THz SpectroscopyMeasuring the superconducting gap
1.05
1.00
3020100
1.00.80.60.40.20.0
T=2.6 K 3.4 K 4.6 K 7.2 K 15 K
8
6
4
2
01.00.50.0
Δ (c
m-1
)
T / TC
ω (THz)
Rs(
T) /
Rn(
15K
)
ω (cm-1)
Mattis-Bardeen Model
M. Ortolani, et al, PRL, 2006
CaAlSiTc=7 K
Superconducting Diamond Tc=5 K
S. Lupi et al, PRB, 2008
Sm(O,F)FeAs Tc=39 K
C. Mirri et al, SUST2008
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1) Optical Pump-Optical Probe Spectroscopy Pump and Probe pulses (often at asingle frequency) fall in the visible (near-IR)
• High energy excitation;• Strong scattering effects;• High energy dynamics; Extrinsic dynamics
2) Optical Pump-THz Probe Spectroscopy Pump (single frequency) in the visible (near-IR) Probe in the far-IR and THz range;
• Similar inelastic effects in the Quasi-Particle decay like in (1) but investigation of the low-energy dynamics;
Pump-Probe Spectroscopy
3) THz Pump-THz Probe Spectroscopy Accordable Pump pulses falling in thefar-IR and THz;
•Possibility to resonate and/or selectionate several fundamental excitations;•Intrinsic dynamics
4) THz Pump- IR+VIS SR Probe Spectroscopy•Accordable Pump pulses falling in the far-IR and THz;
•Possibility to resonate and/or select several fundamental excitations;•Intrinsic strongly-coupled different energy scale dynamics
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Time-Domain Spectroscopy in isotropicsuperconductors
Optical Pump - Optical Probe (THz Probe)1.5 eV
High-Energy Pump Pulse generates an
extrinsic dynamical effect
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Photoexcitation in isotropic superconductorsTHz pump - THz probe
New Experiment
1) Resonating low-energy THz pump determines a non-thermal initial distribution
reducing the bottleneck effect;
2) Probe with broad-band pulse providesinformation on how QP decay toward Cooper pairs;
3) Frequency-resolved spectra (using TDS) furnish both the real and immaginary part of each optical functions;
L. Carr et al, 2007
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High Energy Probe Extension
THz Pump- IR+VIS SR Probe Spectroscopy
•Accordable Pump pulses falling in the far-IR and THz;
•Possibility to resonate and/or select several fundamental excitations;
•Intrinsic strongly-coupled different energy scale dynamics
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Multiple coupled energy scales in complex solids
50 meV
100 meV
THz resonant Pumpingwith a vibrational mode
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Conformational Collective modes ofmacromolecules
Conformational dynamics of DNA, proteins, lipids, result in collective THz modes. Structural changes are criticallyimportant in biological activity thus, if these modes are frozen out, the ability to change structure is lost.
Dynamical evolution from disorderedconformational states to ordering
Large pump THz E field may coherent induceconformational ordering and THz
probe may measure its temporal evolution
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THz extraction& Requirements
1. THz emission covering a large spectral range: 0.1 to 10 (30) THz;
2. THz pulse duration in the sub-ps range;
3. Energy/pulse in the 10µJ-1mJ range;
4. Far-IR, Mid-IR and VIS probe using incoherent radiations;
5. Two sources: CDR+CSR to use the different polarization properties;
6. Optical coupling between the laser and the THz pulse: THz pump-VIS-UVprobe;
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Conclusion
Relevant scientific cases for linear and non-linear THzscience;
Lack of broad-band ultra-fast sources in the THz and far-IR range: THz and far-IR radiations represent a strategiclow-energy extension for UV-X FEL;
Extraction of Coherent Radiation from short electronbunches from SPARC for linear and non-linear frequencyand time domain spectroscopies;
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Acknowledgments
M. Ferrario (LFN-INFN) M. Castellano and E.Chiadroni (LNF-INFN) L. Palumbo (Univ. La Sapienza and LFN-INFN) M. Boscolo (LNF-INFN) G. Gallerano and A. Doria (ENEA) G. Williams (Jefferson Laboratory) E. Karanzoulis (ELETTRA) U. Schade (BESSY-II)