Prof. Gregor Thalhammer Profile

Prof. Gregor Thalhammer

at Medical University Innsbruck

SPIE Involvement:

Author

Publications (6)

Proceedings Article | 5 October 2023 Presentation

Holographic optical force and torque measurement

Monika Ritsch-Marte, Gregor Thalhammer-Thurner

Proceedings Volume PC12649, PC126491F (2023) https://doi.org/10.1117/12.2681574

KEYWORDS: Holography, Scattered light, Particles, Phase retrieval, Phase measurement, Image retrieval, Cameras

Read Abstract +

Proceedings Article | 3 October 2022 Presentation

Hybrid optical and 3D acoustic trapping in a 'sono-optical' microfluidic chip for flexible manipulation of biological samples

Mia Kvåle Løvmo, Simon Moser, Gregor Thalhammer, Monika Ritsch-Marte

Proceedings Volume PC12198, PC121981A (2022) https://doi.org/10.1117/12.2633306

KEYWORDS: Acoustics, Microfluidics, Optical tweezers, Hybrid optics, Transducers, Ultrasonography, Tumor growth modeling, Statistical modeling, Particles, Optical imaging

Read Abstract +

Proceedings Article | 1 August 2021 Presentation

Direct holographic measurement of torque and individual forces in ensembles of trapped particles

Franziska Strasser, Simon Moser, Monika Ritsch-Marte, Gregor Thalhammer

Proceedings Volume 11798, 117980J (2021) https://doi.org/10.1117/12.2596319

KEYWORDS: Particles, Holography, Optical tweezers, Polarization, Optical testing, Optical properties, Light scattering, Blood

Read Abstract +

Proceedings Article | 20 June 2021 Presentation

Sono-optical microfluidic device for the optical inspection of biological samples by contactless trapping and sustained rotation

Mia Kvåle Løvmo, Benedikt Pressl, Gregor Thalhammer, Monika Ritsch-Marte

Proceedings Volume 11786, 117860F (2021) https://doi.org/10.1117/12.2595717

KEYWORDS: Optical tweezers, Microfluidics, Acoustics, Optical inspection, 3D modeling, Tumor growth modeling, Tissues, Tissue optics, Cancer, Animal model studies

Read Abstract +

As cells and tissues are highly dependent on their specific microenvironment, in-vitro models need to incorporate this 3D structure to yield reliable results in biomedical research. Cancer cell spheroids and organoids have become valuable tools in oncology and development studies as they are more representative of in-vivo tissues than the traditional 2D cell culture models and have the potential to improve throughput in drug-screening compared to animal-models and also to go towards personalized medicine. Platforms for both assembly and non-invasive long-term monitoring of such models and also for layered bio-engineered tissues are of great interest. We have developed a sono-optical microfluidic device with 3D acoustic trapping and optical tweezers for non-contact manipulation and imaging of biological samples in liquid suspension. 3D acoustic trapping is achieved with two orthogonal side-transducers and an optically transparent top-transducer that enables optical access for imaging and tweezers to the sample volume. We have demonstrated trapping of biological samples and cancer cell spheroids of several 100µm in size. With acoustics alone or combined with optical tweezers, we can trap samples, change their location and orientation or induce sustained rotation of them, without the sample being in contact with confining structures or embedded in gels. With 3D independent control of the transducers we can adjust the relative strength of the acoustic radiation and viscous torques which will determine whether transient reorientation or continuous rotation of a given sample takes place, and along with numerical simulations and experimental insight we can optimize our strategy to achieve a desired manipulation, within limitations depending on sample size and shape asymmetry. Our technique offers access to optical tomographic information, by rotation of samples around one chosen axis or two axes, and mechanical probing or it can be used for 3D patterning of cells and cell structures in gel precursors for tissue-engineering.

Proceedings Article | 22 August 2020 Presentation

A 'sono-optical' microfluidic device for induced sustained rotation and manipulation of biological samples

Mia Løvmo, Benedikt Pressl, Gregor Thalhammer, Monika Ritsch-Marte

Proceedings Volume 11463, 114630R (2020) https://doi.org/10.1117/12.2567897

KEYWORDS: Microfluidics, Optical tweezers, 3D modeling, Acoustics, Particles, Microorganisms, Animal model studies, Tumor growth modeling, Cancer, Liquids

Read Abstract +

Proceedings Article | 20 August 2020 Presentation

Non-equilibrium memories with levitated nanoparticles: experimental verification of the generalised Landauer’s principle

Mario Arnolfo Ciampini, Tobias Wenzl, Michael Konopik, Eric Lutz, Gregor Thalhammer, Monika Ritsch-Marte, Markus Aspelmeyer, Nikolai Kiesel

Proceedings Volume 11463, 114631N (2020) https://doi.org/10.1117/12.2568484

KEYWORDS: Particles, Nanoparticles, Optical tweezers, Thermodynamics, Thermography, Quantum physics, Optical micromanipulation, Holography applications, Holography, Modulation

Read Abstract +

Showing 5 of 6 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years