Dispersions of electroabsorption susceptibilities: application to a polymeric Langmuir-Blodgett film

Yang, Ke; Cheong, Dong-Wook; Tripathy, Sukant K.; Kumar, Jayant

doi:10.1016/s0030-4018(97)00427-6

Cited by 12 publications

(9 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The detailed theoretical background about this spectroscopic technique is presented in our earlier papers and is further briefly described in the theory section. [30][31][32][33] The experimental setup is shown in Figure 2. ITO-coated glass slides were used to prepare PDAC/poly-DCHD multilayers.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…Electroabsorption spectroscopy can be used to characterize thirdorder NLO susceptibilities and the NLO chromophore orientation for interesting materials. [30][31][32][33]37,38 We have used electroabsorption with normal and oblique incidence of p-polarized light to determine the complex dispersions of χ 1133 (3) and χ 3333 (3) .…”

Section: Orientation and Third-order Nonlinearity Studiesmentioning

confidence: 99%

See 1 more Smart Citation

Electrostatic Self-Assembly of Polydiacetylene Nanocrystals: Nonlinear Optical Properties and Chain Orientation

He¹,

Yang²,

Kumar³

et al. 1999

J. Phys. Chem. B

Self Cite

View full text Add to dashboard Cite

Two different sizes of nanocrystals of poly(1,6-dicarbazolyl-2,4-hexadiyne) (poly-DCHD), have been assembled into composite films by electrostatic self-assembly (ESA) using poly(dimethyldiallylammonium chloride) (PDAC) as the oppositely charged polyelectrolyte. UV-visible absorption showed that the film deposition process is uniform. The AFM images of these films indicate that the nanocrystals are platelets lying on the substrate plane. The chromophore (polydiacetylene backbone) orientation and third-order optical nonlinearity of poly-DCHD/PDAC multilayers are investigated by electroabsorption spectroscopy. The ratio of χ 3333(3) to 3) is significantly less than 3, indicating that the polymer chains are predominantly parallel to the plane of the substrate. In addition, the films possess third-order nonlinearity in the order of 10 -11 esu.

show abstract

Section: Sample Characterizationmentioning

confidence: 99%

Section: Orientation and Third-order Nonlinearity Studiesmentioning

confidence: 99%

Electrostatic Self-Assembly of Polydiacetylene Nanocrystals: Nonlinear Optical Properties and Chain Orientation

He¹,

Yang²,

Kumar³

et al. 1999

J. Phys. Chem. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…[22][23][24][25][26][27][28][29] However, structure-property relationships must also take into account interactions between the polymer and the host, which are known to effect the rheological properties of the polymer 30 as well as the nonlinear-optical response. [31][32][33][34][35][36][37] Mark G. Kuzyk While the above line of research focuses on developing better materials that can be used in a broad range of technologies, nonlinear optics also serves as an important tool for characterizing materials. Since the availability of mostly single-wavelength pulsed lasers, time domain studies have been used to study ultrafast molecular reorientation and the electronic response in liquids, [38][39][40][41] which were used to make fast optical gates, 42 and in solids, for example, to study excitons in quasi-one-dimensional polymeric crystals.…”

Section: Introductionmentioning

confidence: 99%

Using fundamental principles to understand and optimize nonlinear-optical materials

2009

View full text Add to dashboard Cite

Our approach to the problem of understanding the nonlinear-optical response of a material focuses on fundamental concepts, which are exact and lead to broad results that encompass all material systems. For example, one can calculate precisely and without approximation the fundamental limit of the efficiency of any optical phenomenon. Such limits, in turn, when built into a scale-invariant figure of merit can be used to determine what makes a material optimal for maximizing a desired property, such as its nonlinear-optical response. However, since the results are broad and general (for example, fundamental guidelines for making better quantum systems may demand a particular shape of an electron cloud or energy level spacing), the difficulty arises in implementing such fine tuning using the approaches available to the synthetic chemist or nanotechnologist. Undoubtedly, an intimate interplay of empirical and fundamental approaches will need to be applied to the problem of optimizing molecules and materials. Much of the work in the field of nonlinear optics has by necessity focused on empirical approaches. Our work focuses on the fundamental approach, which is beginning to bear fruit in providing practical guidelines for making new materials. This paper reviews progress made over the last decade.

show abstract

“…Electroabsorption spectroscopy can determine the dispersion of each x component and can provide information about chromophore orientation in the material [8][9][10]. The normal incidence of electroabsorption can determine the imaginary part of the change of refractive index 5K which is due to the applied electric field and is associated with the component Xii33-By using Kramers-Kronig relation , the real part of the change of the refractive index Sn can be determined.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the NLO Chromophore Orientation of Polymeric Film by Electroabsorption Spectroscopy

et al. 1997

Self Cite

View full text Add to dashboard Cite

The dispersion of third-order nonlinear coefficients and of three different NLO(nonlinear optical) polymer films were determined by electroabsorption spectroscopy. The first material investigated is an epoxy-based polymer BP-2A-NT, with azobenzene NLO chromophore 4-[((4-nitrophenyl)(azo)phenyl)azo)]aniline in its side chain. The other materials are two polydiacetylenes, poly(BPOD) and poly(4-BCMU), in which the( 3de)localized polymer chains contribute to the third-order nonlinearity. The complex spectrum of of each material is very similar in shape to corresponding spectrum. The ratio of to is 3.2 for BP-2ANT, 1.5 for both poly(BPOD) and poly(4-BCMU). These ratios indicate that the distribution of the side-chain NLO chromophores of BP-2A-NT is very close to three-dimensional isotropy, and the distribution of the main-chain chromophores of poly(BPOD) and poly(4-BCMU) is concentrated on the film plane.

show abstract

Dispersions of electroabsorption susceptibilities: application to a polymeric Langmuir-Blodgett film

Cited by 12 publications

References 4 publications

Electrostatic Self-Assembly of Polydiacetylene Nanocrystals: Nonlinear Optical Properties and Chain Orientation

Electrostatic Self-Assembly of Polydiacetylene Nanocrystals: Nonlinear Optical Properties and Chain Orientation

Using fundamental principles to understand and optimize nonlinear-optical materials

Characterizing the NLO Chromophore Orientation of Polymeric Film by Electroabsorption Spectroscopy

Contact Info

Product

Resources

About