Highly Efficient Nonlinear Optical Conversion in Waveguiding GaSe Nanoribbons with Pump Pulses Down to a Femto‐Joule Level. Issue 5 (2nd January 2018)

• Record Type: Journal Article
• Authors: Liao, Feng; Wang, Yu; Peng, Tao; Peng, Jian; Gu, Zhaoqi; Yu, Huakang; Chen, Tao; Yu, Jiaxin; Gu, Fuxing
• Is Part Of: Advanced optical materials. Volume 6:Issue 5(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-01-02
• Subjects: GaSe nanoribbons -- nonlinear optical conversion -- optical correlators -- optical waveguiding -- ultrashort pulses; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.201701012
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Layered GaSe flakes have revealed strongest second‐harmonic (SH) generation among all the two‐dimensional (2D) atomic crystals measured up to now. However, the unique feature of physical atomic thickness at nanometer scale prevents their practical applications in efficient nonlinear optical conversion due to limited light–matter interaction length. In this work, high quality single‐crystal GaSe nanoribbons (NRs) are fabricated and demonstrated as waveguides with good performance. By taking advantage of the strong confinement and long interaction length of the waveguiding approach, significantly enhanced nonlinear light–matter interaction is observed in GaSe NRs. Based on transverse SH generation, a single GaSe NR‐configured optical auto‐correlator is constructed for ultrashort pulse characterization. Because of the large second‐order nonlinear susceptibility, high sensitivity down to few femto‐joule (fJ) is realized. To the best of our knowledge, this is the highest energy sensitivity among the reported nanoscale auto‐correlators. Such NR waveguides and devices are highly compatible with standard optical fiber systems. The presented results may enable the construction of future energy efficient nonlinear photonic circuitry, chips, and devices. Abstract : Highly efficient frequency conversion in GaSe nanoribbons is demonstrated. Benefitting from the strong confinement of subwavelength optical guiding and high second‐order nonlinearity of the GaSe material, here the fact is demonstrated that a single GaSe nanoribbon optical correlator for ultrashort pulse characterization with femto‐joule‐level input pulse energy has higher sensitivity than those reported before.