thz r&d at dlr’s institute of optical sensor systems · thz qcls for high resolution...
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THz R&D at DLR’s Institute of Optical Sensor Systems
Heinz-Wilhelm HübersInstitute of Optical Sensor Systems German Aerospace Center (DLR)Rutherfordstr. 212489 Berlin, Germany
TeraFlag Meeting, Cassis, September 6th, 2018
DLR.de • Chart 1
Institute of Optical Sensor Systems
• Mission: Research and development of optical sensor systems (UV, VIS, IR, THz) in analogy and extension of the human visual perception.
• Research areas: - focal planes and camera systems- spectrometers- Modelling & data products
• Applications:- Earth observation- Planetary research- Security - Transport
DLR.de • Chart 2
THz R&D @ DLR: - Earth observation- Planetary research/astronomy- Security
THz QCLs for high resolution spectroscopy:Astronomy and atmospheric science
In operation since May 201438 successful flights (∼350 hours)
H. Richter et al., IEEE THz Sci. Technol., 5, 539 (2015)
OI @ 4.75THz
Earth Mars
L. Rezac et al., Astron. & Astrophys. 580, L10 (2015)
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SOFIA
THz spectroscopy: Volatile organic compounds
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230 232 234 236 238 240-2.0-1.5-1.0-0.50.00.51.01.52.02.53.0
Ace
tald
ehyd
e
Viny
l Iso
cyan
ide
Met
hyl N
itrite
Etha
nol
Met
hano
l
Isop
rene
signa
l [m
V]frequency [GHz]
N. Rothbart, IEEE Sensors Journal 16, 8863 (2016)K. Schmalz et al., IEEE TST 65, 1807 (2017)
Objectives:• Detection of VOCs in breath• Detection of toxic (industrial) chemicals
THz imaging with single pixel camera and CS
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S. Augustin, Sci. Reports 3, 97 (2018)
THz semiconductor spetroscopy
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0 50 100 150 200 250
Si:AsSi:BiSi:PSi:Sb
Frequency [THz]
Inte
nsity
[a.u
.]
Wavenumber [cm-1]
0 1 2 3 4 5 6 7
• THz silicon lasers• Spectroscopy of impurities in semiconductors (cw,
time-resolved)
S. Pavlov et al., Phys. Rev. X 4, 021009 (2014)N. Deßmann et al., Phys. Rev. B 89, 035205 (2014)N. Deßmann et al., Appl. Phys. Lett. 106, 171109 (2015)