Structural modification from centrosymmetric Rb₄Hg₂Ge₂S₈ to noncentrosymmetric (Na₃Rb)Hg₂Ge₂S₈: mixed alkali metals strategy for infrared nonlinear optical material design

Abstract

Noncentrosymmetric (NCS) structure is the precondition for second-order nonlinear optical (NLO) materials. In this work, we present a new strategy for constructing NCS structures, that mixed alkali-metals made a new...

Rational designviadual-site aliovalent substitution leads to an outstanding IR nonlinear optical material with well-balanced comprehensive properties

“…14 On the other hand, it can realize centrosymmetric (CS)-to-NCS structure evolution in the chalcogenide system. Some classic examples include CS La 2 CuInS 5 versus NCS La 2 CuSbS 5 , 15 CS Ba 2 GaAsSe 5 versus NCS Ba 2 As 2 Se 5 , 16 CS BaGa 2 Se 4 versus NCS K 0.38 Ba 0.81 Ga 2 Se 4 , 17 CS K 2 Sb 4 S 7 versus NCS K 2 Ag 3 Sb 3 S 7 , 18 CS Rb 4 Hg 2 Ge 2 S 8 versus NCS (Na 3 Rb)Hg 2 Ge 2 S 8 , 19 CS SrGeO 3 versus NCS SrGeOSe 2 , 20 CS SnBr 2 versus NCS Sn 7 Br 10 S 2 , 21 and CS Rb 4 P 2 S 6 versus NCS RbBiP 2 S 6 . 22 Notably, compared to a large number of structural transformations achieved by single-site substitution mentioned above, examples of dual-site and multi-site substitution are rarely reported.…”

(Na0.74Ag1.26)BaSnS4: A New AgGaS2‐Type Nonlinear Optical Sulfide with a Wide Band Gap and High Laser Induced Damage Threshold

“…It is well known that laser damage to materials is largely due to the electronic and thermal effects caused by strong photon absorption. The large optical band gap usually can increase the barrier of photon absorption and then enhance the LIDTs [28] . Meanwhile, benefiting from the substitution of Ag with alkaline metal Na, (Na 0.74 Ag 1.26 )BaSnS 4 also exhibits much larger optical band gap than Ag 2 BaSnS 4 (1.77 eV) [24] .…”

AAg2PS4(A = K, Na/K): the first-type of noncentrosymmetric alkali metal Ag-based thiophosphates exhibiting excellent second-order nonlinear optical performances

“…It is well known that a large optical band gap usually increases the barrier of photon absorption, thereby corresponding to a high LIDT. 55 Therefore, 1 and 2 may achieve high LIDTs. Moreover, the IR spectra of 1 and 2 show no obvious absorption peaks (Fig.…”