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Emerging Materials in Photonics
The present focus issue reviews the recent progresses and the novel trends in the field of recently emerged natural and artificial materials for photonics, prospecting new design ideas, material structures, fabrication techniques, characterization methods, and application perspectives in the field.
Guest Editors: Miriam Vitiello and Manijeh Razeghi

Preface for Special Topic: Emerging Materials in Photonics
Miriam S. Vitiello; Manijeh Razeghi
Contributed Articles
Black phosphorus nanodevices at terahertz frequencies: Photodetectors and future challenges
Open Access
Leonardo Viti; Antonio Politano; Miriam Serena Vitiello
Invited Articles
High power, low divergent, substrate emitting quantum cascade ring laser in continuous wave operation
Open Access
D. H. Wu; M. Razeghi
Invited Articles
Antonio Politano; Leonardo Viti; Miriam S. Vitiello
Invited Articles
S. Ruffenach; A. Kadykov; V. V. Rumyantsev; J. Torres; D. Coquillat; D. But; S. S. Krishtopenko; C. Consejo; W. Knap; S. Winnerl; M. Helm; M. A. Fadeev; N. N. Mikhailov; S. A. Dvoretskii; V. I. Gavrilenko; S. V. Morozov; F. Teppe
Invited Perspectives
Dario Pisignano; Luana Persano; Andrea Camposeo
Invited Articles
Abbas Haddadi; Arash Dehzangi; Sourav Adhikary; Romain Chevallier; Manijeh Razeghi
Invited Articles
Tobias Zederbauer; Aaron Maxwell Andrews; Don MacFarland; Hermann Detz; Werner Schrenk; Gottfried Strasser
Contributed Articles
Towfiq Ahmed; Aiping Chen; Dmitry A. Yarotski; Stuart A. Trugman; Quanxi Jia; Jian-Xin Zhu