Three-Dimensional Optical Data Storage Using Photochromic Materials

Can Gap Tuning Schemes of Long-Range Corrected Hybrid Functionals Improve the Description of Hyperpolarizabilities?

“…[2][3][4][5][6][7][8][9] Specifically, this class of compounds are known to exhibit very large hyperpolarizability tensor β ijk components (i.e., first-order NLO responses) along the direction of charge transfer, [10][11][12][13][14] and their applications include, e.g., frequency doubling of low power diode lasers, electrooptic modulation, optical signal processing, imaging enhancements, and frequency upconversion lasing. 15 But despite all the interest and research around NLO, the design of materials with tailor-made optical properties remains challenging.…”

Can Short- and Middle-Range Hybrids Describe the Hyperpolarizabilities of Long-Range Charge-Transfer Compounds?

“…[5][6][7] Thus,-because of their typically low IP D − EA A , small 1/R, and large dipole moments-materials such as donor-acceptor organic compounds with long-range CT often display large β T z values. [8][9][10][11] This has generated much interest around this kind of compounds owing to the applications of materials with large hyperpolarizabilities in nonlinear optics [12][13][14][15][16][17][18][19] (NLO), and a considerable amount of effort in this area of research has been devoted to the theoretical prediction of NLO properties via computational methods of quantum chemistry. [19][20][21][22][23][24][25][26][27][28] It was recognized early on that the theoretical determination of hyperpolarizabilities was very challenging for ab initio and semi-empirical methods.…”

Electronic Properties of Optically Switchable Photochromic Diarylethene Molecules at the Interface with Organic Semiconductors

“…[2,3] Due to the photochromism, these molecules can switch reversibly between two isomers by light irradiation with different wavelengths. [4][5][6][7] Switching between the two isomers fundamentally changes the electronic properties of the molecules, e.g., the optical gap, molecular dipole moment, molecular electron affinity, and ionization energy.…”