Metal Chalcogenides: A Rich Source of Nonlinear Optical Materials

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Materials chemistry and the pursuit of new compounds through exploratory synthesis are having a strong impact in many technological fields. The field of nonlinear optics is directly impacted by the availability of enabling materials with high performance. Nonlinear optical (NLO) phenomena such as second harmonic and difference frequency generation (SHG and DFG, respectively) are effective at producing a coherent laser beam in difficult to reach frequency regions of the electromagnetic spectrum. Such regions include the infrared (IR), far-infrared, and terahertz frequencies. High performance NLO crystals are critical for applications utilizing these coherent light sources, and new materials are continuously sought for better conversion efficiency and performance. The class of metal chalcogenides is the most promising source of potential NLO materials with desirable properties particularly in the IR region where most classes of materials face various fundamental challenges. We review the recent developments in the discovery of several new high-performing chalcogenide NLO materials for the IR region of the spectrum. Among these, KPSe6, NaAsSe2, and Na2Ge2Se5 have been shown to exhibit some of the highest SHG coefficients (chi((2))) reported, namely, 150, 325, and 290 pm/V, respectively. We focus on their structural characteristics, optical transparency, and nonlinear optical properties. We also discuss a new concept to prepare strong NLO bulk glasses, fibers, and thin films without poling, which would be a promising solution to a main challenge in NLO applications. The impact of cutting-edge theoretical calculations in helping to move this field of materials science and chemistry forward is highlighted.
Publisher
AMER CHEMICAL SOC
Issue Date
2014-01
Language
English
Article Type
Article
Keywords

STRONG 2ND-HARMONIC GENERATION; PHASE-CHANGE PROPERTIES; CATION POLARITY CONTROL; LARGE SHG RESPONSE; PLANE-WAVE METHOD; DIRECT-BAND-GAP; DIMENSIONAL REDUCTION; CRYSTAL-STRUCTURE; 2ND-ORDER NONLINEARITY; ELECTRONIC-STRUCTURE

Citation

CHEMISTRY OF MATERIALS, v.26, no.1, pp.849 - 869

ISSN
0897-4756
DOI
10.1021/cm401737s
URI
http://hdl.handle.net/10203/189949
Appears in Collection
NT-Journal Papers(저널논문)
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