Publication

Production scientifique en photonique, semi-conducteurs et perspectives brevets.

Publications en information brevets

Publications et présentations en matière d'information brevets, couvrant la recherche individuelle et les collaborations avec des partenaires académiques.

Actualités et à venir

  • 2026 Présentation Keynote à Global Summit on Optics, Photonics & Laser Technologies 2026,Julliet 20-21, Paris

    Emerging Trends in Photonics: A Patent-Landscape Cartography of Eight Fast-Growing Domains

    How is intellectual property shifting across eight of photonics' fastest-growing fields: who is filing, where, and where the whitespace remains? A patent-landscape read of the emerging trends, with two domains analysed in-house by TechnoGenesis. Voir la description complète Réduire

    How is intellectual property shifting across eight of photonics' fastest-growing fields: who is filing, where, and where the whitespace remains? A patent-landscape read of the emerging trends, with two domains analysed in-house by TechnoGenesis.

    This presentation surveys eight of the fastest-emerging trends in photonics. They are silicon photonics and co-packaged optics; photonic computing for artificial intelligence; quantum photonics and quantum key distribution (QKD); metasurfaces and flat optics; automotive LiDAR and optical sensing; hollow-core fibre; augmented-reality (AR) waveguide displays; and biophotonics, particularly optical coherence tomography (OCT) and wearable optical bio-sensors. For each domain, TechnoGenesis examines the intellectual-property picture: who is filing patents, in which countries, how fast activity is growing, and where thinly-patented, high-value whitespace remains.

    The trends are illustrated with preliminary patent-family data, drawn from TechnoGenesis analysis using Minesoft Origin and from published landscape reports. The figures are indicative, intended to convey direction and relative scale, not precise numbers.

    Three cross-cutting signals emerge. First, filing volume has shifted toward China, which accounts for roughly 40–60% of published activity in several of the emerging domains. Yet the United States and Europe still hold most international, multi-jurisdiction families. Filing volume and filing quality tell different stories. Second, artificial-intelligence infrastructure is the main demand engine. It pulls co-packaged optics, photonic computing and hollow-core fibre forward together. Third, the domains are converging: metasurfaces feed both LiDAR and AR, and silicon photonics underpins both quantum and computing.

    Together, these eight trends form one clear, high-level map: where photonics is growing fastest, and where patent activity is concentrating. The aim is to help researchers, R&D teams and IP professionals see which domains are accelerating - and where room for new, protectable inventions remains.

    Keywords: patent landscape, photonics, emerging technologies, patent-family analytics, IP strategy, technology S-curves, whitespace analysis.

    Selected highlights, including TechnoGenesis's own S-curve patent analysis, are available to download below. Domain specific analysis available on request

  • 2026 Accepté pour présentation à 16th Constructal Law Conference (CLC2026), Octobre 12-15, Paris

    Patent Flows and the Evolution of Thermal Insulation: A Constructal Reading of the Building Envelope

    TechnoGenesis in collaboration with PSL University (Paris) investigates the evolution of thermal-insulation technologies in architecture through patent-family data, interpreting the building envelope as an evolving flow-regulation interface. Rather than treating insulation as a passive technical lay… Voir la description complète Réduire

    TechnoGenesis in collaboration with PSL University (Paris) investigates the evolution of thermal-insulation technologies in architecture through patent-family data, interpreting the building envelope as an evolving flow-regulation interface. Rather than treating insulation as a passive technical layer, the study approaches insulating systems as architectural devices that regulate heat, air, moisture, energy, and carbon flows across the boundary between interior and exterior environments.

    The research is based on patent data retrieved and analysed through Minesoft Origin, using patent families as the unit of analysis and earliest priority year as the temporal indicator of invention. The method combines CPC/IPC classification, keyword-based patent mining, temporal mapping, and sensitivity analysis using Y02 climate-change-mitigation tags. The corpus focuses on building-envelope technologies related to thermal and hygrothermal performance, including mineral and natural materials, fibrous insulations, synthetic foams, reflective membranes, aerogels, vacuum insulation panels, phase-change materials, bio-based systems, and adaptive envelopes.

    First results reveal a multi-stage trajectory: slow growth until the 1960s, a first wave linked to the 1970s energy crises, renewed growth in the 1990s, and a steep post-2010 acceleration, followed by a possible plateau around 2020–2022. This trajectory is interpreted through the constructal law and the S-curve model of technological spreading as invasion and consolidation processes. The paper argues that the history of insulation is not merely a history of better materials, but a sequence of architectural flow-design strategies through which buildings adapt to changing energetic, environmental, industrial, and climatic constraints.

    Keywords: patent analysis, thermal insulation, building envelope, constructal law, flow regulation, technology S-curve, material innovation, architectural technology.

    Affiliation: Meletis Mexis *, TechnoGenesis, Paris & Prof. Lazaros Mavromatidis, ENSAPM–PSL University, GSA Laboratory, Paris *Corresponding author

Publications en photonique & semi-conducteurs

  • 21 publications à comité de lecture en optoélectronique quantique et lasers à semi-conducteurs.
  • Parmi les revues : Applied Physics Letters, Physical Review Letters et Journal of Applied Physics.

Publications sélectionnées

2014 Article

Dual-polarity GaN micropillars grown by metalorganic vapour phase epitaxy: Cross-correlation between structural and optical properties

This study investigates self-assembled, catalyst-free GaN micropillars (μpillars) grown on (0001) sapphire substrates by metalorganic vapour phase epitaxy (MOVPE). Transmission electron microscopy (TEM) and KOH chemical etching reveal the systematic coexistence of two domains of opposite polarity (G… Voir la description complèteRéduire

This study investigates self-assembled, catalyst-free GaN micropillars (μpillars) grown on (0001) sapphire substrates by metalorganic vapour phase epitaxy (MOVPE). Transmission electron microscopy (TEM) and KOH chemical etching reveal the systematic coexistence of two domains of opposite polarity (Ga-polar and N-polar) within each single micropillar, originating at the micropillar/substrate interface during nucleation and propagating along the entire length of the pillar. Dislocations are generated at the wire/substrate interface but bend after several hundreds of nanometers, resulting in dislocation-free micropillars of several tens of micrometers in length. Spatially resolved cathodoluminescence (CL) and microphotoluminescence (μPL) reveal large optical property differences between the two polarity domains, attributed to unequal incorporation of impurities, dopants and vacancies depending on polarity.

Keywords: GaN micropillars, MOVPE, crystal polarity, Ga-polar, N-polar, TEM, cathodoluminescence, dislocation-free growth

Reference: Coulon P.M., Mexis M. et al.J. Appl. Phys. 115, 153504 (2014)

2011 Article

High quality factor nitride-based optical cavities: microdisks with embedded GaN/Al(Ga)N quantum dots

This work reports a considerable improvement in the optical quality factor (Q) of GaN-based microdisk (μ-disk) resonators embedding GaN quantum dots (QDs) grown on AlN and AlGaN barriers. Room-temperature photoluminescence (PL) spectroscopy reveals a large number of high-Q whispering gallery modes (… Voir la description complèteRéduire

This work reports a considerable improvement in the optical quality factor (Q) of GaN-based microdisk (μ-disk) resonators embedding GaN quantum dots (QDs) grown on AlN and AlGaN barriers. Room-temperature photoluminescence (PL) spectroscopy reveals a large number of high-Q whispering gallery modes (WGMs) spanning a wide spectral range (2.6 to 3.4 eV), enabling identification of different radial mode families through comparison with simulations. GaN/AlN QD-based μ-disks demonstrate record-high Q values (Q > 7000 for a 5 μm diameter disk and Q ≈ 5000 for a 2 μm disk), representing the state of the art for nitride photonic structures. The superior performance is attributed to the high etching quality and to the comparatively lower sub-bandgap absorption of QDs with respect to quantum wells.

Keywords: GaN quantum dots, AlN, microdisk resonators, whispering gallery modes, quality factor, photoluminescence, nitride photonics

Reference: Mexis M., et. al.Opt. Lett. 36, 2203 (2011)

2011 Article

Polariton lasing in a hybrid bulk ZnO microcavity

This work demonstrates polariton lasing in a bulk ZnO planar microcavity under non-resonant optical pumping at a small negative detuning (δ ≈ −1/6 of the 130 meV vacuum Rabi splitting) and at a temperature of 120 K. The strong coupling regime is maintained at lasing threshold, since the coherent non… Voir la description complèteRéduire

This work demonstrates polariton lasing in a bulk ZnO planar microcavity under non-resonant optical pumping at a small negative detuning (δ ≈ −1/6 of the 130 meV vacuum Rabi splitting) and at a temperature of 120 K. The strong coupling regime is maintained at lasing threshold, since the coherent nonlinear emission from the lower polariton branch (LPB) occurs at zero in-plane wavevector, well below the uncoupled cavity mode. The contribution of multiple localized polariton modes above threshold and the non-thermal polariton statistics indicate that the system operates in a far-from-equilibrium regime, likely related to the moderate photon lifetime and in-plane photonic disorder in the cavity.

Keywords: ZnO, microcavity, polariton lasing, strong coupling, Bose-Einstein condensation, vacuum Rabi splitting, photonic disorder

Reference: Guillet T., Mexis M. et al.Appl. Phys. Lett. 99, 161104 (2011)

2009 Article

Control of polarization and dipole moment in low-dimensional semiconductor nanostructures

This work demonstrates the control of polarization and dipole moment in semiconductor nanostructures through nanoscale engineering of shape and composition. Rodlike (columnar) quantum dot (CQD) nanostructures, elongated along the growth direction, are obtained by molecular beam epitaxial growth. By … Voir la description complèteRéduire

This work demonstrates the control of polarization and dipole moment in semiconductor nanostructures through nanoscale engineering of shape and composition. Rodlike (columnar) quantum dot (CQD) nanostructures, elongated along the growth direction, are obtained by molecular beam epitaxial growth. By varying the aspect ratio and the compositional contrast between the rod and the surrounding matrix, the polarization of the dominant interband transition is rotated from transverse-electric (TE) to transverse-magnetic (TM), and the dipole moment is modified — producing a radical change in the voltage dependence of absorption spectra. These results open the way toward optimization of quantum dot optical amplifiers and electro-optical modulators.

Keywords: InAs/GaAs columnar quantum dots, polarization control, TE/TM, dipole moment, molecular beam epitaxy, electro-optical modulator

Reference: Li L.H., Mexis M. et. al.Appl. Phys. Lett. 95, 221116 (2009)

2007 Article

Polarization response of quantum-confined structures using edge-photovoltage spectroscopy

This study proposes a method to obtain the ratio of the fundamental TE/TM optical response of a quantum-confined system from the measurement of the polarization dependence of the edge photovoltage spectrum, by correcting for polarization-dependent features of the experimental system. When applied to… Voir la description complèteRéduire

This study proposes a method to obtain the ratio of the fundamental TE/TM optical response of a quantum-confined system from the measurement of the polarization dependence of the edge photovoltage spectrum, by correcting for polarization-dependent features of the experimental system. When applied to compressive- and tensile-strained InGaP quantum well structures, the results are in excellent agreement with known ratios of the band-edge matrix elements. This method is of particular value in the study of quantum dot systems where the polarization behaviour is difficult to predict.

Keywords: InGaP, quantum wells, edge-photovoltage spectroscopy, polarization, TE/TM, quantum dots

Reference: Mexis M., et.al., Semicond. Sci. Technol. 22, 1298 (2007)

Perspectives

Perspectives complémentaires, mises à jour, interventions et notes de recherche appliquée liées à l’intelligence brevets deep-tech.

2026 Proposition d’article

L'information brevets, composante à part entière de l'écosystème deeptech

Retour sur le SPRING Paris-Saclay 2026 et sur la place de l'information brevets comme composante de l'écosystème deeptech, aux côtés du financement, de l'industrialisation et de l'accompagnement. Voir la description complèteRéduire

Retour sur le SPRING Paris-Saclay 2026 et sur la place de l'information brevets comme composante de l'écosystème deeptech, aux côtés du financement, de l'industrialisation et de l'accompagnement.

L’information brevets, composante à part entière de l’écosystème deeptech Retour sur le SPRING Paris-Saclay 2026 et sur la place de l’information brevets comme composante de l’écosystème deeptech, aux côtés du financement, de l’industrialisation et de l’accompagnement. Retour sur le SPRING Paris-Saclay 2026 Le 2 juin dernier s’est tenu, au Technocentre Renault Group de Guyancourt, le Paris-Saclay SPRING — le rendez-vous annuel de l’écosystème deeptech du cluster Paris-Saclay. Organisé par l’Établissement Public d’Aménagement Paris-Saclay, l’événement réunit chaque année startups, laboratoires, grands groupes industriels, financeurs et structures d’accompagnement autour d’un format dense : pitchs de startups, conférences, rendez-vous B2B et networking. Avec plus de 1300 participantes, il constitue l’un des points de rencontre majeurs de la deeptech, à l’échelle française comme européenne. L’édition 2026 mettait à l’honneur les « SPRING 120 », cent vingt acteurs clés sélectionnés à travers quatre filières — Greentech & Food, Health-Biotech, Industry & Services et Digital Technologies — avec, en toile de fond, un fil conducteur révélateur de l’époque : innovation, compétitivité et souveraineté technologique. Au-delà des projets technologiques eux-mêmes, ce qui frappe lorsqu’on parcourt le catalogue de l’événement c’est la présence, discrète mais réelle, des métiers de la propriété intellectuelle et de l’information brevets. Un constat qui mérite d’être souligné auprès de notre communauté : l’information brevets n’est pas un service périphérique de l’innovation, mais bien une composante de son écosystème, au même titre que le financement, l’industrialisation ou l’accompagnement. Une diversité de profils au service de l’innovation Le catalogue recense en effet plusieurs familles d’acteurs. Les cabinets de conseil en propriété industrielle d’abord — Santarelli, Lavoix, IPSILON, YESMYPATENT, Groupe Vidon, IP Trust, ou encore le Cabinet Anthony Berton — qui combinent expertise juridique, stratégie de protection et accompagnement des déposants. Les acteurs institutionnels ensuite : l’INPI, présent en tant qu’interlocuteur de référence sur la propriété industrielle ; la SATT Paris-Saclay et CNRS Innovation, dont la mission de valorisation et de transfert technologique place naturellement la donnée brevet au cœur de leur activité. Enfin, des prestataires spécialisés en information et analyse brevets, dont le métier — veille technologique, état de l’art, cartographie brevet, analyse de liberté d’exploitation — constitue souvent un trait d’union entre la recherche, les déposants et les décideurs. Cette pluralité est en soi un signal. Elle montre que les besoins en information brevets se déclinent selon des logiques et des points d’entrée variés au sein d’un même écosystème, et que les profils qui y répondent sont complémentaires plus que concurrents. Parmi ces profils, celui du prestataire indépendant spécialisé en information brevets se structure autour d’acteurs positionnés sur des domaines techniques précis. TechnoGenesis, par exemple, intervient sur la deeptech — photonique, physique quantique, matériaux avancés — avec une approche d’analyse brevet adossée à une expertise scientifique. StartingBloch, de son côté, accompagne les acteurs de l’innovation dans le domaine des sciences de la vie. Deux structures, deux domaines, mais une même conviction : l’information brevets gagne à être pensée au plus près des spécificités techniques de chaque filière. Dans le domaine de l’optoélectronique et de la photonique, bien représenté à Saclay, ce constat est particulièrement net. Plusieurs acteurs de premier plan y étaient présents : HORIBA, spécialiste de l’instrumentation scientifique et de la spectroscopie ; le III-V Lab, laboratoire de recherche commun dédié aux composants à semi-conducteurs III-V ; l’Institut Photovoltaïque d’Île-de-France (IPVF), qui développe les technologies photovoltaïques de nouvelle génération ; ou encore 3D PLUS, concepteur de composants électroniques miniaturisés pour le spatial. Dans des domaines aussi denses en brevets, où la frontière entre l’état de l’art académique et l’innovation industrielle se déplace en permanence, la veille technologique et l’analyse brevet ne sont pas un luxe : elles conditionnent les choix de R&D, les décisions d’investissement et les stratégies de protection. C’est précisément à cette intersection que se situe le travail de l’expert en information brevets et le même raisonnement vaut pour la science de la vie ou toute autre filière à forte intensité de brevets. Au final, le SPRING Paris-Saclay rappelle une évidence parfois sous-estimée : l’information brevets fait partie intégrante de la chaîne de l’innovation deeptech. Là où se rencontrent chercheurs, industriels et investisseurs, la donnée brevet circule, éclaire les décisions et crée du lien.