2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference

Advance Programme

Virtual Meeting

CEST time zone

21 - 25 June 2021

www.cleoeurope.org

Sponsored by• European Physical Society / Quantum Electronics and Optics Division• IEEE Photonics Society• The Optical Society

25th International Congress on Photonics in EuropeCollocated with Laser World of Photonics Industry Days

https://world-of-photonics.com/en/

Friday�Posters

CLEO®/Europe-EQEC 2021 ⋅ Friday 25 June 2021

ROOM 1

CH-P.12 FRI

Highly �exible deep learning based specklecorrelation extraction∙Y.Wang1, Z. Lin2, Y. Li2, C. Hu2, H. Yang2, and M. Gu1;1Centre for Arti�cial-Intelligence Nanophotonics, Schoolof Optical-Electrical and Computer Engineering, Univer-sity of Shanghai for Science and Technology, Shanghai,China; 2School of Optical-Electrical and Computer Engi-neering, University of Shanghai for Science and Technol-ogy, Shanghai, ChinaWe show that the trained convolutional neural network

(COECNN) is able to extract scalable speckle correla-

tion and make high-quality sparsity object predictions

through an entirely di�erent set of di�users.

CH-P.13 FRI

An Optical Fiber-based SPR Sensor for ColorectalCancer DiagnosisR. Xavier, J. Alpino, ∙C. Moreira, and R. Cruz; IFPBInstituto Federal de Educação, Ciencia e Tecnologia daParaiba, Joao Pessoa, BrazilAnoptical �ber-based surface plasmon resonance sensor

for colorectal cancer (CRC) diagnosis is presented here.

In the proposed study, plastic (Polymethyl Methacrylate

- PMMA) and �uoride-based (ZBLAN – ZrF4, BaF2,

LaF3, ALF3, NaF) core materials have been investigated.

CH-P.14 FRI

�e contribution has been withdrawn.

CH-P.15 FRI

Fourier Transform Spectrometer Combined with aMid-Infrared Supercontinuum Source for Trace GasSensing∙M. Nematollahi, A. Khodabakhsh, K. Eslami Jahromi,R. Krebbers, M.A. Abbas, and F.J.M. Harren; Trace GasResearch Group, Department of Molecular and LaserPhysics, Institute for Molecules and Materials, RadboudUniversity, 6525 AJ , Nijmegen, NetherlandsWe present a multi-species trace gas sensor based on a

mid-infrared supercontinuum source, a multi-pass cell,

and a compact home-built Fourier transform spectrom-

eter, demonstrating 1GHz spectral resolution and detec-

tion sensitivity of a few hundred ppbv.Hz−1/2.CH-P.16 FRI

Fiber-coupled balanced-detection interferometriccavity-assisted photothermal spectroscopy for SO2and CO detection∙J.P. Waclawek1,2, H. Moser1,2, and B. Lendl1;1Technische Universität Wien, Vienna, Austria;

2Competence Center CHASE GmbH, Vienna, AustriaHighly sensitive, selective, as well as compact SO2 and

CO trace gas sensing by balanced-detection ICAPS em-

ploying an overall �ber-coupled probe laser con�gura-

tion is reported.

CH-P.17 FRI

Pitchfork Bifurcation of a Nonlinear OpticalResonator Enhances Sensing Speed and Precision∙K.J.H. Peters and S.R.K. Rodriguez; Center for Nanopho-tonics, AMOLF, Amsterdam, NetherlandsWedemonstrate a novel optical sensing scheme based on

a hysteretic resonator.�e sensitivity of our sensor scales

as a square-root function of the perturbation strength.

Counterintuitively, the precision increases for fast mea-

surements.

CH-P.18 FRI

Silicon micro-electromechanical resonator forenhanced photoacoustic gas detection.∙W. Trzpil, N. Maurin, R. Rousseau, D. Ayache, A. Vicet,and M. Bahriz; IES, Univ. Montpellier, CNRS, F-34000 ,Montpellier, FranceWepresent a new sensitive (11ppmv in 1s on ethylene us-

ing QCL) concept of gas sensor based on photoacoustic

spectroscopy using silicon micro-resonator with capaci-

tive transduction. We compared the limit of detection to

commercial QTF.

CH-P.19 FRI

�e E�ect of Internal Loss on the Visibility of aSeeded SU(1,1) Interferometer∙I. Jonas; Bar Ilan university , Ramat Gan, IsraelWe present an analysis of a seeded SU(1,1) interferome-

ter in the high-loss regime.�is con�guration retains its

quantum properties on top of the classical stimulation,

rendering it practical in applications of quantum illumi-

nation and sensing.

CH-P.20 FRI

Evaluating Confocal Microscopy as a Tool toDiagnose Red Blood Cell Diseases∙L. Rey-Barroso1, M. Roldán2,5, F.J. Burgos-Fernández1,S. Gassiot3,5, A. Ruiz-Llobet4, I. Isola3,5, and M.Vilaseca1; 1Centre for Sensors, Instruments and Sys-tems Development, Technical University of Catalonia,Terrassa 08222, Spain; 2Unit of Confocal Microscopy,Service of Pathological Anatomy, Hospital Sant Joan deDéu, Esplugues de Llobregat 08950, Spain; 3Laboratoryof Hematology, Service of Laboratory Diagnosis, HospitalSant Joan de Déu, Esplugues de Llobregat 08950, Spain;

4Service of Pediatric Hematology, Hospital Sant Joan deDéu, Esplugues de Llobregat 08950, Spain; 5Institute ofPediatric Research, Hospital Sant Joan de Déu, Espluguesde Llobregat 08950, SpainRed blood cell diseases are di�cult to diagnose since

they present characteristics that are somehow unspeci�c.

In order to observe what could be a�ected at a cellular

level, confocal microscopy was applied in this work.

CH-P.21 FRI

Multi-channel laser Doppler anemometer forairborne integration as real-time optical wind vectorsensorO. Kliebisch, ∙P.Mahnke, R.-A. Lorbeer, N.Miller, andM.Damm; German Aerospace Center, Institute of TechnicalPhysics, Stuttgart, GermanyA rack-mounted laser Doppler anemometer (LDA) for

integration into an research aircra� is presented. �e

LDA is tested as a potential optical air data sensor for

measuring true air speed and local air�ow angles.

CH-P.22 FRI

InAs/AlAsSb-Based Quantum Cascade Detector at2.7 μm∙M. Giparakis1, H. Knötig1, M. Beiser1, H. Detz2,W. Schrenk2, B. Schwarz1, G. Strasser1,2, and A.M.Andrews1; 1Institute of Solid STate Electronics E362, TUWien, Vienna , Austria; 2Center for Micro- and Nanos-tructures E057-12, TU Wien, Vienna , AustriaA quantum cascade detector based on the

InAs/AlAs0.16Sb0.84 material system was grown by

molecular beam epitaxy. �e device showed a room

temperature peak response at the above bandgap wave-

length of 2.7 μm, CO2 absorption line.

CH-P.23 FRI

High-Precision Interferometry With Helical LightBeams∙N. Kerschbaumer1, L. Fochler1, M. Reichenspurner1, T.Lohmüller1, M. Fedoruk2, and J. Feldmann1; 1Chair forPhotonics and Optoelectronics, Nano-Institute LMU Mu-nich, Department of Physics, Munich, Germany; 2VortexPhotonics, Munich, GermanyWe report that interferometry of helical light beams pro-

vides bene�ts for precisionmeasurements of transparent

and �uidic samples. Details on generating optical vortex

beams using spiral phase plates in a Michelson interfer-

ometer will be discussed.

CH-P.24 FRI

Q- factor enhancement in photonic crystal cavitiesbased on trapezoidal slotted nano-sticks forrefractive index sensing∙J.H. Mendoza-Castro1,2, L. O’Faolain3,4, and M.Grande1; 1Dipartimento di Ingegneria Elettrica edell’Informazione, Politecnico di Bari, Bari, Italy;2Institute of Chemical Technologies andAnalytics, ViennaUniversity of Technology, Vienna, Austria; 3Centre forAdvanced Photonics and Process Analysis, Munster Tech-nological University, Cork, Ireland; 4Tyndall NationalInstitute, Cork, IrelandWe present the design of slotted high-Q factor photonic

crystal cavity in which an improvement of 2 orders of

magnitude in the Q factor, as a function of angle side-

walls and number segments, is demonstrated

CH-P.25 FRI

High-Q whispering-gallery-mode resonator ofmaterial with strong Faraday E�ect.∙A. Danilin1, G. Slinkov2, V. Lobanov3, K. Min’kov4,and I. Bilenko5; 1Faculty of Physics, Lomonosov MoscowState University, Moscow, Russia; 2Faculty of Physics,Lomonosov Moscow State UniversityFaculty of Physics,Lomonosov Moscow State University, Moscow, Russia;3Russian Quantum Center, Moscow, Russia; 4RussianQuantum Center, Moscow, Russia; 5Faculty of Physics,Lomonosov Moscow State University, Moscow, RussiaWe investigated the magneto-optical e�ect in the Ter-

bium Gallium Garnet WGMR possessing the record

quality factor Q=1.45×10^8 for such material. We haveobserved an eigenfrequency modulation and polariza-

tion declination induced by a harmonic magnetic �eld.

CH-P.26 FRI

Investigation of the in�uence of the number ofspectral channels in colorimetric analysis∙A. Stefani1, T. Götz1, J. Vieregge1, M. Wiedmann1, W.Tschekalinskij1, N. Holzer1, V. Peters1, M. Dold2, M.-L. Bauerfeld2, and S. Junger2; 1Fraunhofer Institute forIntegrated Circuits IIS, Erlangen, Germany; 2FraunhoferInstitute for Physical Measurement Techniques IPM,Freiburg, GermanyWe investigate the in�uence factors such as number,

spacing and bandwidth of spectral channels of multi-

spectral sensors used in colorimetric analysis, combing

measurements, simulation andmachine learning to infer

the desired chemical parameters.

170

InAs/AlAsSb-Based Quantum Cascade Detector at 2.7 µm

Miriam Giparakis1, Hedwig Knötig1, Maximilian Beiser1, Hermann Detz2, Werner Schrenk2, Benedikt

Schwarz1, Gottfried Strasser1,2, and Aaron Maxwell Andrews,1

1. Institute of Solid State Electronics E362, TU Wien, Gußhausstraße 25-25a 1040 Vienna, Austria

2. Center for Micro- and Nanostructures E057-12, TU Wien, Gußhausstraße 25-25a 1040 Vienna, Austria

Quantum cascade detectors (QCDs) are zero-bias intersubband photovoltaic devices, which are produced by

growing a superlattice-like active region of alternating thin layers [1,2]. The quantum wells and barriers are formed

by the conduction band offset (CBO) of the corresponding materials. Optical transitions between two bound states

in this heterostructure are used to detect light in the mid- and far-infrared spectral region. QCDs are room-

temperature devices, that due to the sub-picosecond intersubband transitions, can operate at a bandwidth exceeding

20 GHz [3].

The InAs/AlAs0.16Sb0.84 material system has a large CBO of 2.1 eV and therefore has the potential for short-

wavelength mid-infrared QCDs [4]. InAs has a low effective electron mass of 0.023 𝑚𝑒∗ allowing for high electron

mobility and increased optical transition strength. However, InAs has a narrow bandgap of 0.354 eV (2855 cm-1),

therefore wavelengths below 3.50 µm would be absorbed by the InAs substrate.

Fig. 1 a) X-ray diffractogram of the grown QCD device. b) Room-temperature FTIR measurement in ambient conditions of a cleaved side facet using a mid-infrared Globar light source.

We present a QCD based on the InAs/AlAs0.16Sb0.84 material system grown lattice-matched to the n-type InAs

substrate using molecular beam epitaxy (MBE). The optical absorption in the active region was designed for the

CO2 absorption line at 2.7 µm (3704 cm-1, 0.459 eV). The active region was repeated for 20 periods for a total

thickness of 970.8 nm. The sharp superlattice peaks are exhibited in the x-ray diffraction pattern in figure 1a.

Contact layers were grown before and after the active region.

The sample was wet-etched into 140×140 µm mesas with Ti-Au contacts. The bottom contact was fabricated

on the backside of the substrate. The absorption spectrum was measured with the sample at room temperature,

zero-bias, and a long-pass filter with a cut-off wavelength of 2.5 µm. Initial characterization was performed with

in-coupling through the cleaved mesa side-facet. The standard 45° polished facet illumination is not possible with

the InAs substrate [4]. Under ambient conditions, the processed device shows an absorption that lies above the

bandgap energy of the InAs substrate at the designed 2.7 µm (3704 cm-1, 0.459 eV), see figure 1b.

References 1 A. Harrer, B. Schwarz, S. Schuler, P. Reininger, A. Wirthmüller, H. Detz, D. MacFarland, T. Zederbauer, A.M. Andrews, M.

Rothermund, H. Oppermann, W. Schrenk, and G. Strasser, “4.3 µm quantum cascade detector in pixel configuration,” Optics Express 24, No. 15, 17043 (2016).

[2] B. Schwarz, P. Reininger, A. Harrer, D. MacFarland, H. Detz, A.M. Andrews, W. Schrenk, G. Strasser, “The limit of quantum cascade

detectors: A single period device”, Appl. Phys. Lett. 111, 061107 (2017).

[3] J. Hillbrand, L. Krüger, S. Dal Cin, H. Knötig, J. Heidrich, A.M. Andrews, G. Strasser, U. Keller, B. Schwarz; “High-speed quantum cascade detector characterized with a mid-infrared femtosecond laser”, Optics Express, accepted (2021). 4 P. Reininger, T. Zederbauer, B. Schwarz, H. Detz, D. MacFarland, A.M. Andrews, W. Schrenk, and G. Strasser, “InAs/AlAsSb based

quantum cascade detector,” Appl. Phys. Lett. 107, 081107 (2015).

InAs/AlAsSb-Based Quantum Cascade Detector at 2.7 µm

M. Giparakis*1, H. Knötig1, M. Beiser1, H. Detz1, W. Schrenk2, B. Schwarz1, G. Strasser1,2, and A.M. Andrews1

Introduction and Motivation

Quantum cascade detectors (QCDs) are room-temperature photovoltaic devices characterized by their narrow absorption spectra. Theunipolar intersubband transitions take place between two bound levels in the conduction band of a quantized superlattice-like well/barrierstructure. The conduction band offset (CBO) between the well and barrier materials determines the upper limit of the designableabsorption energy [1, 2].The lattice-matched InAs/AlAs0.16Sb0.84 material system has the largest CBO in nonpolar III-V semiconductors with 2.1 eV at the Γ-point andtherefore has the potential for short-wavelengths mid-infrared QCDs [3]. Still, short wavelengths require wells in the sub-nm range and aretherefore challenging to grow. InAs has the benefit of a low effective mass of 0.023 me, which allows an increased optical transitionstrength, but with its narrow bandgap of 0.354 eV wavelengths below 3.5 µm are absorbed by the substrate.

1Institute of Solid State Electronics E362, TU Wien, Austria2Center for Micro- and Nanostructures E057-12, TU Wien, Austria*email: miriam.giparakis@tuwien.ac.at

Growth and processing FTIR measurements

• The figure shows a comparison of the room-temperature responsivity of 200 x 200 µm mesaswith a second-order diffraction grating period of1.24 µm and the best performing grating period of0.97 µm, which are in agreement with simulations.

• The measurement was performed using a Fourier-transform infrared spectrometer with a broadbandmid-infrared Globar source.

• A long-pass filter with a specified cut-offwavelength of 2.5 µm was used.

• The intersubband absorption was confirmed withTM & TE polarization measurements.

References and Acknowledgments

[1] D. Hofstetter et al., “Quantum-cascade-laser structures as photodetectors,” Applied Physics Letters 81, 2683 (2002).[2] A. Harrer et al., “4.3 μm quantum cascade detector in pixel configuration,” Optics Express 24, No. 15, 17043 (2016).[3] P. Reininger et al., “InAs/AlAsSb based quantum cascade detector,” Applied Physics Letters 107, 081107 (2015).[4] J. Devenson et al., “InAs/AlSb quantum cascade lasers emitting below 3 µm,” Applied Physics Letters 90, 111118 (2007).

Design

• The (004) HR-XRD scan of the presentedQCD: It was grown lattice-matched to anInAs substrate by molecular beam epitaxy.

• Shutter sequences, growth rates andgrowth temperatures were optimized forthis growth.

• The figure shows 3 active regionswith a designed optical transitionwavelength of 2.7 µm (0.46 eV).

• Due to the absorption of InAs atthis wavelength, the active region issandwiched between two short-period superlattices, which serve ascontacts [4].

• Finished process of the QCD. The mesa issurrounded on three sides by the bottomcontact. An extended top contact leaves themesa surface free.

• Surface-normal illumination: the light iscoupled into the detector using diffractiongratings, because QCDs are not sensitive tosurface-normal light. Simulations for thegratings were performed beforehand andpredicted an absorption maximum with agrating period of 0.97 µm.

long-pass filter cut-off

100 µm

1 µm