Bisdioxaborine Polymethines with Large Third-Order Nonlinearities for All-Optical Signal Processing

Abstract

Organic materials with large third-order nonlinearities in the near-infrared spectral regime are critical in the development of photonic devices to be utilized in all-optical signal processing. We have developed polymethine materials, specifically bisdioxaborine-terminated polymethine dyes, which possess large ultrafast third-order nonlinearities and low nonlinear loss all in the near-infrared spectral regime. An extended bisdioxaborine polymethine anion exhibited the largest value of gamma (third-order microscopic nonlinearity) at 1.3 mum (|gamma| = 5.7 x 10-32 esu) and showed no characteristics of symmetry breaking, unlike other polymethines of similar lengths. A neat film of this molecule maintained relatively low linear loss in the near-infrared and showed a large third-order macroscopic nonlinearity at 1.3 mum (|chi(3)| = 3.6 x 10-10 esu), with a temporal response of less than 8 ps. Furthermore, the real part of chi(3) was nearly an order-of-magnitude larger than the imaginary component. Consequently, this material exhibited good figures of merit for all-optical signal processing throughout the entire telecommunications band.

Structural, Electrical and Optical Characterization Studies on Glycine Picrate Single Crystal : A Third Order Nonlinear Optical Material

“…Due to the weak inductive effects, the nitro group in picric acid exerts a small shift in the absorption edge of GP around 260 nm which recommends GP as a better material for the 762 T. Uma Devi , N. Lawrence, R. Ramesh Babu, K. Ramamurthi, G. Bhagavannarayana Vol. 8,No.10 fabrication of laser based spectral instruments and also good enough for the generation of higher harmonic light using IR lasers through NLO phenomena. The Z-scan measurements, performed with 632 nm laser pulses, revealed that GP possesses prominent third order nonlinearity.…”

“…The 756 T. Uma Devi , N. Lawrence, R. Ramesh Babu, K. Ramamurthi, G. Bhagavannarayana Vol. 8,No.10 study of amino acid crystallizes with other organic and inorganic molecules, which presents a high non-linear optical coefficient has gained much attention in the last few years because of the possibility of using them in technological devices [1,2]. Our laboratory is engaged in finding new materials for NLO applications and some of these were reported recently [3][4][5][6].…”

“…Third-order nonlinear optical (NLO) materials with weak nonlinear absorption (NLA) but strong nonlinear refraction (NLR) have attracted considerable attention because of their potential uses in the optical signal processing devices [8][9][10][11][12][13]. The Z-scan method has gained rapid acceptance by the nonlinear optics community as a standard technique for separately determining the nonlinear changes in index and changes in absorption.…”

A Sensitive Technique for Two-Photon Absorption Measurements: Towards Higher Resolution Microscopy

“…At each wavelength, such 2 values are calculated based on the open-aperture intensity scan data and finally the TPA spectrum is generated as a function of different wavelengths. Such a knowledgebase makes it possible to choose the suitable excitation and detection wavelengths to a region wherein the TPA cross-section as well as the figure of merit [14,15] of the particular chromophore is fairly high. We also performed the unchopped z-scan experiments at much lower repetition rate of 1kHz from an amplified Ti:Sapphire laser that has minimal thermal effects and compared those to our HRR laser results.…”

Cooperative signal amplification for molecular communication in nanonetworks

“…quantum physics) to serve its purpose. Nanosensors [4] and nanoswitches [15,33] Nanomachines count on size as the most identifying feature. Consequently, other properties or limitations can be deduced from it.…”