Near-field terahertz photocurrent-graphene plasma non-local quantum effect

Recently, Professor Marco Polini and Professor Frank HL Koppens of the Institute of Photonics in Spain published an article entitled "Tuning quantum nonlocal effects in graphene plasmonics" in "Science".

In this paper, the researchers used a scattering near-field optics method to perform a fine scan on the surface of a graphene-(h-NB)-metal composite system at a nanometer scale, thereby observing graphene in the terahertz band. The plasma propagates at a near Fermi speed. It has been found that the non-local response of graphene plasma can be detected at very slow speeds (hundreds of times lower than the speed of light), and near-field imaging can clearly reveal the quantum of massless Dirac electron gas by means of parameterless matching. The description, in turn, demonstrates three types of non-local quantum effects, namely single-particle rate matching, mutual enhancement of the Fermi rate and mutual attenuation of compression.

Through this near-field optics approach, researchers have finally provided new ways to determine the full-space response of electronic systems.

Figure 1 terahertz scattering near-field optical microscope and photocurrent test results

At the same time that foreign users have obtained scientific research results, domestic scholars are also “good news”, and scientific research work has continuously won the recognition of world-class magazines. As of June this year, domestic users only published 7 articles this year. Among them, Suzhou University users' research on organic perovskite solar materials was included in Advance Materials (Impact Factor 19.79). Sun Yat-Sen University users and users of Suzhou University on graphene nanostructures. The study of graphene plasma was included in the nature publication Light: Science & Application (impact factor 13.6). So far, neaspec domestic users have published 13 articles in top international academic journals since the end of 2015, and there are 6 articles with influence factors greater than 10.

Figure 2 Research results of domestic scholars in the past two years

At the end of the text of "Science", the author sternly stated: "RH is cofounder of Neaspec GmbH, a company producing scattering-type scanning near-field optical microscope systems such as the ones used in this study." Professor Hillenbrand further pointed out that "this may be just The beginning of a new era of near-field nano-vision."

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