High-resolution microscopy of plasmon field distributions by scanning tunneling luminescence and photoemission electron microscopies

Ludovic Douillard; Fabrice Charra

doi:10.1016/j.crhy.2012.10.001

Nanophotonics and near field / Nanophotonique et champ proche

High-resolution microscopy of plasmon field distributions by scanning tunneling luminescence and photoemission electron microscopies
[Microscopie à haute résolution des champs plasmoniques par microscopie tunnel à balayage de sonde et par microscopie de photoémission multiphotonique]

Ludovic Douillard ¹ ; Fabrice Charra ¹

¹ CEA-Saclay, service de physique et chimie des surfaces et interfaces, IRAMIS, 91191 Gif-sur-Yvette cedex, France

Comptes Rendus. Physique, Volume 13 (2012) no. 8, pp. 815-829.

Résumé
Abstract

Lʼexploitation des résonances plasmons dans le but de promouvoir lʼinteraction entre des molécules conjuguées et des champs optiques motive actuellement dʼintenses recherches. Les objectifs en sont la compréhension du rôle médiateur des interactions optiques joué par les modes de plasmon et la réalisation de nanostructures métalliques avec une précision moléculaire voire atomique, combinant les effets dʼexaltation de champ et dʼantennes optiques. Dans cet article de synthèse, nous présentons des exemples de cartographie des champs plasmoniques basés sur deux techniques de microscopie : lʼémission de lumière induite par microscopie tunnel à balayage de sonde (scanning tunneling microscopy — STM) et lʼimagerie de photoémission multiphotonique (photoemission electron microscopy — PEEM), deux techniques parmi celles qui offrent aujourdʼhui les meilleures résolutions spatiales pour la microscopie plasmonique. Une propriété peu conventionnelle de la jonction du microscope à effet tunnel est sa capacité à se comporter comme une source localisée de lumière. Celle-ci peut être exploitée pour sonder localement les propriétés opto-électroniques en surface, en particulier les modes plasmoniques, avec une résolution spatiale inférieure au nanomètre. Lʼavantage de cette résolution ultime est cependant contrebalancé par la nécessité dʼune déconvolution parfois délicate de lʼinfluence de la sonde. Alternativement, les inconvénients inhérents aux techniques de sondes locales peuvent être surmontés par lʼimagerie des électrons photoémis, en utilisant les méthodes bien établies dʼoptique électronique. Ceci permet lʼobtention de cartes dʼintensité en deux dimensions reflétant directement la distribution non perturbée du champ proche optique. Cette approche fournit des images avec une résolution spatiale de lʼordre de 20 nm en routine et pouvant atteindre 5 nm avec les instruments les plus récents, incluant un dispositif de correction des aberrations.

The exploitation of plasmon resonances to promote the interaction between conjugated molecules and optical fields motivates intensive research. The objectives are to understand the mechanisms of plasmon-mediated interactions, and to realize molecularly- or atomically-precise metal nanostructures, combining field enhancements and optical antenna effects. In this review paper, we present examples of plasmonic-field mappings based on scanning tunneling microscope (STM)-induced light emission or multiphoton photoemission (PEEM), two techniques among those which offer todayʼs best spatial resolutions for plasmon microscopy. An unfamiliar property of the junction of an STM is its ability to behave as a highly localized source of light. It can be exploited to probe optoelectronic properties, in particular plasmonic fields, with ultimate subnanometer spatial resolution, an advantage balanced by a sometimes delicate deconvolution of local-probe influence. Alternatively, local-probe disadvantages can be overcome by imaging the photoemitted electrons, using well-established electron optics. This allows obtaining two-dimensional intensity maps reflecting the unperturbed distribution of the optical near field. This approach provides full field spectroscopic images with a routine spatial resolution of the order of 20 nm (down to 5 nm with recent aberration corrected instruments).

Publié le : 2012-10-01

DOI : 10.1016/j.crhy.2012.10.001

Keywords: STM, PEEM, Subnanometer spatial resolution
Mot clés : Microscopie tunnel à balayage de sonde, Imagerie de photoémission multiphotonique, Résolution spatiale inférieure au nanomètre

Affiliations des auteurs :

Ludovic Douillard ¹ ; Fabrice Charra ¹

¹ CEA-Saclay, service de physique et chimie des surfaces et interfaces, IRAMIS, 91191 Gif-sur-Yvette cedex, France

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     title = {High-resolution microscopy of plasmon field distributions by scanning tunneling luminescence and photoemission electron microscopies},
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Ludovic Douillard; Fabrice Charra. High-resolution microscopy of plasmon field distributions by scanning tunneling luminescence and photoemission electron microscopies. Comptes Rendus. Physique, Volume 13 (2012) no. 8, pp. 815-829. doi : 10.1016/j.crhy.2012.10.001. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2012.10.001/

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