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Optical Materials Express

Optical Materials Express

  • Editor: David Hagan
  • Vol. 4, Iss. 4 — Apr. 1, 2014
  • pp: 587–596

Broadband optical and microwave nonlinear response in topological insulator

Shuqing Chen, Chujun Zhao, Ying Li, Huihui Huang, Shunbin Lu, Han Zhang, and Shuangchun Wen  »View Author Affiliations

Optical Materials Express, Vol. 4, Issue 4, pp. 587-596 (2014)

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We experimentally studied the nonlinear response of topological insulator (TI): Bi2Te3 at both the optical and microwave band, and found that the absorbance of topological insulator decreases with the increase of the incident power and reaches at a constant value once the incident power exceeds a threshold. By the open-aperture Z-scan and balanced twin detector measurement techniques, the optical saturable absorption property of TI: Bi2Te3 from 800 nm to 1550 nm was experimentally demonstrated. Based on a power dependent microwave transmittance experimental setup, TI: Bi2Te3 was also identified to show a saturation intensity of ~12 μW/cm2 and a normalized modulation depth of ~70%. We argue that the optical (resp. microwave) saturable absorption in topological insulator is a natural consequence of the Pauli-blocking principle of the electrons filled in the bulk insulating state (resp. surface metallic state). Our experimental results illustrate the potential photonic applications of TI: Bi2Te3 at both the optical and microwave band.

© 2014 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(350.3950) Other areas of optics : Micro-optics
(350.4010) Other areas of optics : Microwaves
(160.4236) Materials : Nanomaterials

ToC Category:
Nonlinear Optical Materials

Original Manuscript: December 11, 2013
Revised Manuscript: February 8, 2014
Manuscript Accepted: February 9, 2014
Published: March 3, 2014

Shuqing Chen, Chujun Zhao, Ying Li, Huihui Huang, Shunbin Lu, Han Zhang, and Shuangchun Wen, "Broadband optical and microwave nonlinear response in topological insulator," Opt. Mater. Express 4, 587-596 (2014)

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