As a typical two-dimensional material, ever since the first exfoliation of graphene in 2004, many studies have been carried out around its unique mechanical, optical and electrical properties. Due to its unique lattice structure, it exhibits extremely high carrier mobility and excellent thermal conductivity, showing high stability at high temperatures. This makes graphene a promising material for thermal applications. In the past few years, Joule heating of micro scale graphene for thermal infrared emission and broadband light sources has attracted significant attentions. However, the potential of large area and array of graphene in thermal infrared applications has rarely been explored. Here we experimentally demonstrate infrared display with centimeter scale graphene film array.
As a two-dimensional material, graphene shows excellent properties in many aspects. Among them, it exhibits extremely high carrier mobility, excellent thermal conductivity, and high temperature stability due to its unique lattice structure, so it is superior than previously used conventional materials in the field of thermal applications. This paper introduces the study of graphene heating film of centimeter scale. We transfer large areas of graphene films to four different substrates to study the characteristics of heating temperature, thermal response time and heating uniformity of graphene films. Experimental results show that graphene with a heating area of 0.7cm × 1cm can be rapidly raised from room temperature to above 100℃ at a DC voltage of 25V. According to the experimental results, graphene performs well in both heating temperature and heating rate compared to traditional heating materials, which provides good prospects for the use of graphene in fields such as deicing, defogging, medical physiotherapy and others.
Physics explain the world in strict rules. And with these rules, modern machines and electronic devices with exact operation manner have been developed. However, human beings exceed these machines with self-awareness. To treat these self-awareness students as machines to learn strict rules, or to teach these students according to their aptitude? We choose the latter, because the first kind of teaching would let students lose their individual thoughts and natural ability. In this paper we describe the individualized teaching of “semiconductor lasers”.
In the past two decades, the development of nanophotonics, particularly photonic crystals, plasmonics, metamaterials and 2D material photonics, has led to the demonstration of many new and exotic optical phenomena that greatly changed our understanding of optics and electromagnetics. Bringing such cutting-edge knowledge to optical courses for undergraduate and postgraduate students can not only help the students better understand the fundamental principles of optics but also significantly increase their study interests. We have done this in the past several years and here we show some examples ranging from metamaterials to the optical responses of graphene.
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