Patrick Ferrand
@PFerrandFresnel
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Associate prof MCF HdR @ComixTeam @InstitutFresnel (@univamu , @cnrs, @CentraleMars) Optics, #microscopy, #ptychography, #OA and more. ORCID 0000-0002-7395-5663
Marseille, France
Joined January 2017
RT @PFerrandFresnel: On remet ça en 2024 ! Deux classes de 6èmes du collège Germaine Tillion de Marseille ont appris que la lumière peut êt….
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On remet ça en 2024 ! Deux classes de 6èmes du collège Germaine Tillion de Marseille ont appris que la lumière peut être décrite comme une vague 🌊. Expériences avec des polariseurs. Explications avec des objets du quotidien #FDS2024
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Proud of our two high-school interns presenting their own poster at the #coherence2024 conference. We proposed them to present the French education system
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RT @InstitutFresnel: 🧐#Demain nous installerons notre stand sur le village des sciences de #Marseille. Le Vendredi est réservé aux scolaire….
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Aujourd'hui, trois classes de 4e du collège Malraux ont pu faire des expériences amusantes pour appréhender la nature ondulatoire de la lumière. #FDS2023
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RT @InstitutFresnel: 🤩La Fête de la Science c'est dans 4 jours ! #FDS2023.Du 6 au 16 oct, des dizaines d'événements de culture scientifique….
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Préparatifs pour mes interventions en collèges dans le cadre de "sciences dans les classes". #FDS2023
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In this paper, we describe how to adapt vectorial ptychography to measure cholesteric liquid crystals, which possess unique circular-polarization properties.
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Proud of this new paper, in collaboration with Michel Mitov (INPHYNI @Univ_CotedAzur) #OSA_OL
opg.optica.org
The problem of imaging materials with circular-polarization properties is discussed within the framework of vectorial ptychography. We demonstrate, both theoretically and numerically, that using...
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RT @PFerrandFresnel: Surprisingly, the best standard to have in your lab to avoid errors comes from the film industry: RealD 3D googles. Th….
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Surprisingly, the best standard to have in your lab to avoid errors comes from the film industry: RealD 3D googles. The LEFT eye is a LEFT-circ analyzer, while the RIGHT eye is a RIGHT-circ analyzer (Using the definition "seen from the source").
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Sadly, so far scientists did agree about wether the handedness must be described from the source or the observer. A big cause of trouble when buying components, since this is not always stated by suppliers.
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. while from an observer (looking through the beam) it is said to be "RIGHT-circular".
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viewed from the source (behind the propagating wave), it is said to be "LEFT-circular",.
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Now if light forms a RIGHT-oriented helix propagating in space. (Note that it can be described by the LEFT-hand rule 🙃),.
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. while from an observer (looking through the beam) it is said to be "LEFT-circular".
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viewed from the source (behind the propagating wave), it is said to be "RIGHT-circular",.
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If light forms a LEFT-oriented helix propagating in space. (Note that it can be described by the RIGHT-hand rule 🙃),.
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In #optics, people fight to name circular #polarizations. A thread to understand what is means. ⤵️#optics.
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