Color‐Sensitive Ultrafast Optical Modulation and Switching of Terahertz Plasmonic Devices. Issue 15 (31st May 2018)

• Record Type: Journal Article
• Authors: Kumar, Abhishek; Srivastava, Yogesh Kumar; Manjappa, Manukumara; Singh, Ranjan
• Is Part Of: Advanced optical materials. Volume 6:Issue 15(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-05-31
• Subjects: color filters -- hole arrays -- terahertz modulation -- ultrafast switching; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201800030
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: 2D micro‐nanostructured metal films with hole arrays show promising features such as the extraordinary transmission of light. Such systems are interesting in the field of subwavelength photonics and nonlinear optics due to their high field confinement in addition to their inherent spectral scalability and frequency selective response. Several active schemes to control the extraordinary transmission are recently demonstrated. However, these dynamic devices do not reveal any obvious color‐dependent modulation of the resonant transmission behavior. Here, color‐sensitive ultrafast modulation of extraordinary resonant transmission of terahertz (THz) waves through 2D metallic hole arrays is demonstrated. Pumping the silicon beneath the metallic array with light of different colors and identical fluences exhibit significantly different ultrafast switching dynamics and modulation. The color‐dependent sensitivity and control of THz waves at an ultrafast timescale provide an extra degree of freedom that opens up new opportunities for future applications in active subwavelength optics, optoelectronics, and all‐optical switching of THz photonic devices. Abstract : Modulating terahertz waves by shining different color femtosecond pulses of light on semiconductors evokes a color‐dependent ultrafast feature that provides an extra degree of freedom to design semiconductor‐based hybrid photonic devices. The color of external pump enables the tuning of threshold fluence required for modulation and controls the ultrafast switching dynamics of terahertz plasmonic devices.