We study the dynamics of individual emitters in micro cavities.

We develop open micro cavities to trap light in small volumes and thereby increase the interaction with intra-cavity emitters. Important aspects in this development are the optical penetration in the mirrors, coupling between optical modes, and scattering and clipping losses.

In this thesis, we aim to shed light on the diverse and often opposing roles of integrin α3β1 in cancer.

Multi-Angle Dynamic Light Scattering (MADLS) is a technique that is used to determine properties of particles in suspension. The measurements give the hydrodynamic size distribution of individual particles as well as particle clusters, and assists in the interpretation of the stability of the particles…

Our group explores the larger domain of quantum measurement. In particular we investigate two themes that are closely connected: The detection of specially prepared quantum states of light and understanding and characterizing quantum photon detectors.

Coordination chemistry is the chemistry of metal atoms

PhD Defence

Decentralized plug and play systems for energy production are the future picture of our society. Artificial photosynthetic systems are used for this purpose.

How can we manipulate the biotic and abiotic environment to increase thrips resistance in tomato and chrysanthemum? More specifically we ask: How can plant secondary metabolites that are not soluble in water be delivered to plants in seed coating or root dipping treatment? Can bacteria be used to…

PhD Defence

Lecture

How can novel bioimaging technologies and vertebrate model species be used to gain a better understanding of early cellular behaviours with the ultimate goal to increase our understanding of human development and disease processes?

On Monday 9 May Mercury will pass between the Earth and the Sun. This rare event can be followed in the Leiden Observatory. The Observatory's new solar telescope produces a very clear image and offers a unique opportunity to observe Mercury at the highest magnification possible in the Netherlands.

Rottgering

We highly value the precision and clarity brought by the use of analytic tools combined with creative and non-standard attempts to shine new light on the big questions of theoretical philosophy.

The Leiden Observatory is starting a crowdfunding campaign to raise enough money to construct a new telescope.

High resolution altitude data created by airborne LiDAR allow the investigation of large areas and often inaccessible tracts of land and has the potential to reveal undiscovered archaeological heritage.

In this thesis we have discussed several parameters that affect the electrochemical conversion of enviromentaly harmful molecules such as nitrates and carbon dioxide to more valuable and less deleterious compounds, in order to cast light onto the mechanism of the reaction to achieve an efficient and…

Books, prints or photographs, they exist to be read or viewed. But they are so much more.

Metal complexes and 2D materials like graphene were combined to produce structures that can function as sensors.

Surface plasmons (SPs) are surface waves at the interface between a dielectric and a good metal, and are formed by the interaction between light and the free electrons at the metal-dielectric interface. They provide strong field confinement for optical fields, opening new possibilities for enhanced…

Selim Ahmetoğlu defended his thesis on 12 February 2019.

What motivates people to provide help to, or seek help from other groups? And what are the psychological consequences of receiving help from another group?

Sebastian Diessner, Assistant Professor at the Institute of Public Administration, focuses on the role of the European Central Bank in a critical phase toward a new presidency and its approach to monetary policy by looking at both financial market and survey data.

This thesis aims to improve the detection from ultra-weak single emitter by enhancing their emission properties with plasmonic nanostructures. We exploit the wet-chemically synthesized single crystalline gold nanorods (GNRs) as our basic frameworks in the whole studies, simply because of their unique…

Emiel Por is our Leiden Observatory's nominee for the C.J. Kok Jury Award 2020.

Advancing the understanding of the interaction of light and matter on the single-quantum level is important for near-future quantum technologies but also to answer fundamental questions.

The quantum nature of matter and light has grown into a broad and fruitful research field for theorists and experimentalists alike. It combines foundational research with toward applications, the most well known of which is the quantum computer.

In this project, the hypothesis that language contact crucially impacts the development of spatial grammar and phonology is investigated.

In this penetrating self-portrait dating from around 1629, Rembrandt presents himself as an aristocratic young man. He enrolled in Leiden University as a student of the arts in 1620, but whether he actually attended lectures is unknown. In his paintings and prints, he incorporated many topics that are…

A team of Leiden astronomers has managed to calculate the first 100 million years of the history of the Oort cloud in its entirety. Until now, only parts of the history had been studied separately. The cloud, with roughly 100 billion comet-like objects, forms an enormous shell at the edge of our solar…

Central in coordination and organometallic chemistry is the synthesis of new chelating ligands, the synthesis and characterization of metal complexes with these ligands, and the study of their properties. An important goal in my research is to create understanding of the relation between the structures…

In Leiden University's Vision on Sustainability 2030, biodiversity (biological diversity) is an important focus in its teaching and research and on its campuses.

Het project heeft plaats gevonden onder begeleiding van Prof.dr.ir.Tjerk Oosterkamp. De titel van de presentatie is:

An international team of scientists including Leiden's Joe Callingham has discovered nineteen red dwarf stars that unexpectedly emit radio waves. The outbursts possibly originate from interaction with exoplanets. The results of the research appear in two scientific publications.

A team of astronomers led by Dutch scientists have directly imaged a giant planet orbiting at a large distance around a sun-like star. Why this planet is so massive, and how it got to be there, is still a mystery. The researchers will publish their findings in the journal Astronomy & Astrophysics.

A pop-up exhibition ‘All the Einsteins’ will open at Rijsmuseum Boerhaave on 29 May 2019. This is the first time that the museum will present its entire collection of handwritten letters and documents by Einstein. The exhibition marks, among others, the publication of the first photo of a black hole…

From Mexico and Indonesia to China and Italy: people from all over the world read about the Leiden Observatory publication on the birthplace of comets. This research suggests that all comets in our solar system might come from the same place: a specific range in the flat disk of dust and gas that once…

This project investigates the role of art in the public and academic debate on biosolar energy

Twenty years from now, the world population is estimated to be around 9 billion people (now 7.8 billion). In combination with the improvements in living standards and the corresponding growth in consumption, this will result in an enormous increase in the demand for food, consumables, water and energy.…

At Leiden Observatory, researchers investigate the origin of stars and their planetary systems. They detect and characterize planets around other stars, which are called exo-planets. They study how stars and planets form. And they follow molecules from interstellar clouds to nascent planet systems.…

How distance-dependent is graphene as biological sensor?

Twee teams of astronomers, including from the universities of Amsterdam and Leiden, have discovered how hot gas giants are surrounded by large halos of thin helium gas, an indication that they are slowly losing their atmosphere. The helium, that was recently seen for the first time by the Hubble space…

Deep observations made with the MUSE spectrograph on ESO’s Very Large Telescope have uncovered vast cosmic reservoirs of atomic hydrogen surrounding distant galaxies. The exquisite sensitivity of MUSE allowed for direct observations of dim clouds of hydrogen glowing with Lyman-alpha emission in the…

Biophysicist Anjali Pandit has been awarded a FOM 'Projectruimte' research grant for her proposal ‘Tuning into the photosynthetic membrane with atomistic precision’.

Commercial enterprises who want to make use of the expertise and facilities are referred to LAB , the commercial unit responsible for specialized laboratory work.

How do massive stars form? What molecular species hide in the Martian atmosphere? Are there Earth-like exoplanets in habitable zones? These questions can be answered using the Extremely Large Telescope (ELT), which will be built over the next six to seven years. ‘To make these future discoveries possible,…

This study seeks to identify suitable local environments conditions for the objects displayed at the Jordanian museums using the proper methods in order to contribute to the stabilization of these objects.

De lichtheid van literatuur: Engagement in de multiculturele samenleving (The Lightness of Literature: Engagement in the Multicultural Society) is a plea for the social relevance of literature. The book delves into an age-old debate about literature and social engagement, which has recently been reinvigorated…