Studies on thermal nonlinear optical effects on cyclododecanone crystals for IR optical switching application

Bharath, D.; Kalainathan, S.; Anbuselvi, D.

doi:10.1007/s10854-018-0199-2

Cited by 3 publications

(1 citation statement)

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“…From the application’s point of view, thermal NLO effects in 2D materials have been reviewed recently, which includes examples of all-optical phase shifters and all-optical switches with a microsecond to millisecond time response . Bharath et al reported on thermal NLO effects on cyclododecanone crystals for IR optical switching application, with a thermal nonlinear refractive index ranging from 9.44 × 10 –8 to 7.85 × 10 –7 cm 2 /W at 632.8 nm, which is two orders of magnitude lower than the values reported here for the LTMD suspensions. Furthermore, although thermal nonlinearities are in general slow, it has been pointed out by Khurgin and co-workers that ultrafast response, in the picosecond range, can be obtained when the optical fields are concentrated into a volume of a few tens of nanometers, which can be readily considered for the LTMDs in the suspensions employed in this work.…”

Section: Discussionmentioning

confidence: 95%

Intensity-Dependent Thermally Induced Nonlinear Optical Response of Two-Dimensional Layered Transition-Metal Dichalcogenides in Suspension

et al. 2023

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We report experimental studies of spatial self-phase modulation (SSPM) in liquid suspensions of semiconducting MoS 2 , MoSe 2 , MoTe 2 , WS 2 , semimetallic ZrTe 2 , WTe 2 , and metallic NbS 2 , NbSe 2 using linearly and circularly polarized light with CW or CWmode-locked (ML) excitation lasers. For the semiconducting suspension of nanoflakes, excitation above and below the bandgap was performed. The results show that the intensity-dependent changes in the refractive index responsible for SSPM and associated ring formation are explained as arising from thermal origin. Measured values of the effective thermal nonlinear coefficient, n 2,th , range from ∼4.3 × 10 −7 to ∼4.2 × 10 −5 cm 2 /W, depending on the absorption strength of the suspension, and are independent of the optical excitation regime (polarization and laser mode of operation). The use of circularly polarized light to obtain the same results as seen with linearly polarized light is fundamental to complement the results, demonstrating that at the spectro-temporal regimes studied, thermal nonlinearity explains well the ring formation, in addition to providing the original SSPM results for NbS 2 , ZrTe 2 , and WTe 2 .

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Section: Discussionmentioning

confidence: 95%