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Synergistic research efforts in multistep chemical synthesis and state‐of‐the‐art optical spectroscopy have permitted the realization of graphene quantum dots (GQDs) with defined structures and properties, paving the way towards their possible applications in photonics and optoelectronics. One such fruitful feedback loop between synthesis and spectroscopy is represented by the recent development of stable GQDs with zigzag edges, displaying excellent spectral features such as optical gain and strong absorption/emission in the visible/near‐infrared regions, which are appealing for applications in photonics. In this progress report, the authors provide an overview of the latest developments in the chemical synthesis and advanced spectroscopic investigations of atomically precise GQDs, with particular emphasis on those with zigzag‐edged structures. The latest developments in their applications are also introduced, for example, in lasing and optical imaging, and new opportunities in the field of GQDs are discussed, including chiral GQDs with chiroptical properties and possible applications of GQDs for long‐lived luminescence. The authors highlight the role and power of chemical synthesis and spectroscopy in providing new GQDs with promising optical properties that pave the way for new and exciting applications in photonics. [ABSTRACT FROM AUTHOR]

This review describes hybrid photonic-plasmonic structures based on periodic structures having metallic coatings or inserts, which make use of the Tamm plasmon for sensing applications. The term Tamm plasmon relates to a particular resonance resulting from the enhancement of a surface plasmon resonance absorption via coupling to a wavelength-matching photonic bandgap provided by a photonic crystal. Tamm plasmon-based devices come in an ample variety of material and geometric combinations, each designed to perform a specific kind of measurement. While the physical effect is quite well documented and understood, its implementation in devices is still a rapidly developing and thriving field, which leaves open many possibilities for novel designs and new applications. We therefore aim to give a complete overview on the topic, to provide an ordered collection of designs and uses, as well as to spur further development on the subject of the Tamm plasmon for sensing applications. [ABSTRACT FROM AUTHOR]