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MIPRO 2020 - 43rd International Convention

OPHO - Optoelectronics and Photonics

Wednesday, 9/30/2020 5:00 PM - 7:00 PM, Bellavista, Grand hotel Adriatic, Opatija

Hybrid Event

Special session OPHO is an integral part of the conference Microelectronics, Electronics and Electronic Technology /MEET.

Event program
Wednesday, 9/30/2020 5:00 PM - 7:00 PM,
Bellavista, Grand hotel Adriatic, Opatija
5:00 PM - 5:05 PM Charmens Foreword and Introducing all Participants  
5:05 PM - 5:25 PM Invited Lecture 
D. Caputo, N. Lovecchio, F. Costantini, A. Buzzin, A. Nascetti, G. de Cesare (University of Rome Sapienza, Rome, Italy)
Thin Film Technology Meets Lab-on-Chip System 
Lab-on-Chip technology is gaining great interest due to the many possibilities that it offers in the fields of life sciences, from parallel analysis in genomics [1] to point-of-care devices [2] in medical diagnostics. At the beginning, Lab-on-Chip devices essentially consisted of a microfluidic network that miniaturized the analytical procedures leading to faster reaction kinetics and lower sample and reagents consumption [3]. Recent devices integrate on a single substrate several functional modules, that allow all the functions of a human-scale test laboratory including transferring samples, drawing off a precise volume of a chemical product, reagent mixing, detection and quantification of biomolecules [4]. Within this framework, this lecture focuses on the work done at the Department of Information Engineering, Electronics and Telecommunications of University of Rome “La Sapienza” in developing a multifunctional optoelectronic platform which includes on a single glass substrate several thin film devices. In particular, the platform integrates amorphous silicon photo-sensors for on-chip detection and temperature control and optical filters for selection of specified wavelength. By coupling this platform with a microfluidic network application in the field of mycotoxin detection and DNA amplification will be presented. References [1] D.N. Howbrook et al., 2003, Drug Discov. Today 8 (14), 642–651. [2] W.E. Jung et al., 2015, Microelectron. Eng. 132, 46–57. [3] P. Abgrall, A.M. Gue, 2007. J. Micromech. Microeng. 17 (5), R15–R49. [4] M.A. Miled et al., 2013. IEEE Trans. Bio-Med. Eng. 7 (4), 557.
5:25 PM - 6:55 PM Papers 
1.V. Gradišnik (Faculty of Engineering, University of Rijeka, Rijeka, Croatia)
Analysis of a-Si:H p-i-n Photodiode Detection of HeLa Cells Luminescence 
Today, optical biosensors are the most promising candidates for Lab-on-a-Chip (LoC) with regards to their sensitivity and miniaturization. The label-free optical detection method has a low negative influence on tissue and is therefore suitable for the detection of mammalian cells and the molecule itself. The attractive optical methods for analyte detection, chemiluminescence and fluorescence, require a highly sensitive photodetector as biotransducer. In addition, the optoelectronic technology provides the thin film hydrogenated amorphous silicon (a-Si:H) photodiodes integration in microfluidic systems. In our previous work we have observed the influence of the density of native and lightinduced localized states, distributed in the mobility gap of aSi:H at different bias voltages, on the detection of luminescence of HeLa cells. As in the optical bias dependence of the modulated photocurrent method (OBMPC), the sample is excited by a blue LED light bias beam of constant intensity, to activates the dangling bonds in a-Si:H and induces a second light beam carried out from the chemiluminescent emission reaction in HeLa cells. The analysis of recombination rate and space charge density in aSi:H is performed to better understand the underlying physics for luminescence detection at applied different bias voltages on the photodiode.
2.D. Giubertoni, G. Paternoster, F. Acerbi (Fondazione Bruno Kessler, Trento, Italy), X. Borrisé Nogue (Institut Català de Nanociència i Nanotecnologia, Bellaterra - Barcelona, Spain), A. Cian (Fondazione Bruno Kessler, Trento, Italy), A. Filippi (Department of Physics and Astronomy “G. Galilei”, University of Padua, Padua, Italy), A. Gola (Fondazione Bruno Kessler, Trento, Italy), A. Guerrero Barbero, F. Perez Murano (Instituto de Microelectrónica de Barcelona - Centro Nacional de Microelectrónica, Bellaterra - Barcelona, Spain), F. Romanato (Department of Physics and Astronomy “G. Galilei”, University of Padua, Padua, Italy), E. Scattolo, P. Bellutti (Fondazione Bruno Kessler, Trento, Italy)
Plasmonic Enhanced Photodetectors for Near Infra-Red Light Detection 
Silicon based single photon avalanche diodes (SPAD) are able to detect single photons in the visible part of the spectrum with high detection efficiency and high timing resolution. They also provide both single-photon sensitivity and fast responsivity in large-area detectors if arranged in extended arrays as Silicon Photomultipliers (SiPM). However, in applications exploiting near infrared light like light detection and ranging (LiDAR), the detector performance is hindered by the limited Si absorption coefficient. The latter implies absorption depths much larger than the typical active thickness of these devices (10-100 μm against few micrometers) resulting in a quantum efficiency (QE) too low for most of the previous applications. The exploitation of Surface Plasmon Polaritrons (SPP) can convert light in highly-confined modes and enhance the absorption of NIR photons. In this contribution, the first results on the integration of plasmonics nanostructures on thin silicon photodiodes are reported. Electro-optical measurements were carried out and the QE has been measured in the full 400-1100 nm spectrum. The resulting QE on the first prototypes is higher than 7% at 950 nm, an enhancement of about 45% with respect to the reference structure, paving the way for the application of metallic nanograting to SPADs and SiPMs devices.
3.G. Pathak (Ecole des Mines de Saint Etienne, Gardanne, France), D. Čakara (University of Rijeka, Rijeka, Croatia)
Variable Angle Spectroscopic Ellipsometry Study of Poly(3,4-ethylenedioxythiophene):Polystyrene Sulfonate Thin Films in Contact with Air 
Thin films of conducting polymer complex poly(3,4- ethylenedioxythiophene) : polystyrene sulfonate (PEDOT:PSS) are studied by means of varied angle spectroscopic ellipsometry (VASE) in the wavelength range 370-880 nm, at five different angles of incidence (AOI). The goal is to simultaneously determine the film thicknesses and its dielectric function. Samples of varied film thickness are prepared by spin coating the aqueous suspension onto Si/SiO2 wafers at different spin rates, and subsequent annealing at 170 C. The measured spectra at constant angles of incidence are fitted by applying Fresnel’s equations for a stratified optical layers model (SLM) which postulates several optical layers with well defined optical interfaces, in combination with the dielectric function ~(). Different possibilities for data fitting are critically assessed, pointing to some pitfalls in the VASE data analysis and interpretation. Two methods which involve the assessment of a theoretical Lorentz-Drude (LD) dielectric function were compared: one in which a unique function is assumed for all of the prepared samples (i.e. film thicknesses), while in the other, a variation of the dielectric function was permitted. The validation criteria include comparisons with the experimental film thickness measured by means of the atomic force microscope, the quasi-experimental dielectric function fitted independently for each wavelength, and the literature value of the main optical transition energy calculated by quantum mechanical modelling. In the limit of the studied system and model, all of these comparisons point to the necessity of simultaneously fitting the VASE data measured for films of varied thickness, in which case both the thickness and the dielectric function may be determined.
4.M. Karuza, D. Božičević (University of Rijeka, Rijeka, Croatia), G. Cantatore (University of Trieste, Trieste, Italy), M. Vretenar (University of Twente, Enschede, Netherlands)
Radiation Pressure Sensor 
Mechanical elements with dimensions in the nanometer range at least in one direction have been successfully employed as sensors in various devices. Their mechanical properties have to be known with maximum precision in order to quantify the sensor's response to external excitation. This often poses a significant challenge due to mechanical fragility of the sensor elements. Here we present a measurement of the mechanical response of a 100 nm thick silicon nitride membrane. The external excitation force is provided by a laser beam modulated in amplitude while the displacement of the membrane was measured by a Michelson interferometer with a homodyne readout.
5.Z. Djinovic (ACMIT Gmbh, Wiener Neustadt, Austria), M. Tomic (Institute of Technical Sciences of SASA, Belgrade, Serbia), R. Pavelka (ENT specialist, Wiener Neustadt, Austria), G. Sprinzl (University Hospital St. Pölten, St. Pölten, Austria), H. Traxler (Medical University of Vienna, Centre for Anatomy and Cell Biology, Vienna, Austria)
Measurement of the Human Cadaver Ossicle Vibration Amplitude by Fiber-Optic Interferometry 
In this paper we present the results obtained by contactless measurement of vibration of the incus inside the middle ear of a human cadaver, exposed to an external calibrated sound source. The measurement configuration was a Michelson fiber-optic interferometer based on a 3x3 fiber optic coupler, with a VCSEL source. The interferometric signal fading was solved using two quasi-quadrature signals and specialized signal processing. The ossicle reflection was augmented by a very light piece of retroreflective material attached to the bone. We measured the amplitude of vibration at different sound pressure levels, independently monitored by a decibel meter placed in the proximity of the cadaver ear. The accuracy of the measurement technique was proved by using a calibrated piezo transducer exposed to vibrate with amplitude of 7nm at 1kHz. We performed the experiments on 8 cadavers in total. The measured amplitudes were found to be in the range between 1 pm and 1 nm, under the sound excitation of 40-90 dB SPL @ 1kHz, respectively.
6.A. Škrobonja, I. Jurdana, I. Panić (University of Rijeka, Faculty of Maritime Studies, Rijeka, Croatia), N. Wakabayashi (Kobe University, Graduate School of Maritime Sciences, Kobe, Japan)
Marine Fiber Optic and Spinning Mass Gyrocompasses 
One of the key aspects of modern navigation fundamentally depends on precise and current information that describes ships position and heading. In order to provide this information, different technologies have been implemented and used onboard ships throughout the maritime history such as celestial and terrestrial navigation or magnetic compass systems. First recent major advance has been achieved with implementation of first sufficiently sophisticated mechanical gyrocompass which was on the trail of today's modern mechanical gyrocompasses by Hermann Anschutz-Kaempfe in 1906. This had further influenced greater development and research with respect to gyrocompass manufacturing technology and measurement techniques. This knowledge led to the development and wide scale implementation of stable and precise modern gyrocompasses as they are today, however it has been realized that fundamental errors related to gyrocompass technology can never be fully mitigated. Fiber optic compass technology can eliminate or mitigate errors related to gyroscope-based technology and has been frequently researched and developed as a comparable solution to the commonly used gyrocompass. This paper presents historical overview of gyrocompass research and development, principles of operation, associated errors in measurement and comparative analysis both mechanical and fiber optic gyrocompass.
6:55 PM - 7:00 PM Discussion and Closing 

Basic information:

Vera Gradišnik (Croatia), Irena Jurdana (Croatia), Duško Čakara (Croatia)

Registration / Fees:
Price in EUR
Up to 14 September 2020
From 15 September 2020
Members of MIPRO and IEEE
Students (undergraduate and graduate), primary and secondary school teachers

The discount doesn't apply to PhD students.


Vera Gradišnik

University of Rijeka
Faculty of Engineering
Vukovarska 58
HR-51000 Rijeka, Croatia

e-mail: or
Phone: +385 51 651557

The best papers will get a special award.
Accepted papers will be published in the ISSN registered conference proceedings. Presented papers in English will be submitted for inclusion in the IEEE Xplore Digital Library (and exclusively not presented papers with the justified reason for not being able to be presented).
There is a possibility that the selected scientific papers with some further modification and refinement are being published in the Journal of Computing and Information Technology (CIT).


Opatija, with its 170-year-old tourism tradition, is the leading seaside resort of the Eastern Adriatic and one of the most famous tourist destinations on the Mediterranean. With its aristocratic architecture and style, Opatija has been attracting artists, kings, politicians, scientists, sportsmen, as well as business people, bankers and managers for more than 170 years.

The tourist offer in Opatija includes a vast number of hotels, excellent restaurants, entertainment venues, art festivals, superb modern and classical music concerts, beaches and swimming pools – this city satisfies all wishes and demands.

Opatija, the Queen of the Adriatic, is also one of the most prominent congress cities in the Mediterranean, particularly important for its ICT conventions, one of which is MIPRO, which has been held in Opatija since 1979, and has attracted more than a thousand participants from over forty countries. These conventions promote Opatija as one of the most desirable technological, business, educational and scientific centers in South-eastern Europe and the European Union in general.

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