Disadvantages Of Organic Nonlinear Materials

The advantages of organic nonlinear materials over classical inorganic nonlinear materials are summarized below :
(1) Organic structures can be grown into large crystals, their crystalline layers fabricated into structures that can be deposited into thin films, layer by layer as in- the Langmuir - Blodgett technique, or incorporated into polymers for deposition and processing as highly oriented thin film structures. The resulting structure can exhibit optimized orientations for many types of nonlinear behaviors especially those of interest for waveguide formats.
(2) Many organic materials especially high-performance polymers have high mechanical strength as well as excellent environmental and thermal stability. Recent developments have produced

• Lower cost: The ease of processing directly translates into a lower cost to fabricate.
• High second- and third-order susceptibility: This technology exhibits exceptional performance in doubling and tripling the frequency of light passing through it, making it at least comparable to inorganic materials.
• Low dielectric constant: An optical material with a high dielectric constant requires a larger poling voltage in order to polarize the dipole moment and can suffer changes in the refractive index. This technology requires no poling voltage and maintains its refractive index.
• High electro-optic coefficient: Materials with a high electro-optic coefficient are more suitable for electro-optic modulation for high-speed devices.
• Colorless: It is believed that the clarity of the doubling material will prevent the absorption of visible light, allowing a wide variety of light frequencies to be doubled.
• Resistant to laser damage: The tripling material can be exposed to 432,000 20-nanosecond pulses at 20 Hz without any evidence of damage to the organic material, making it ideal for use in photonic