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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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TiO₂ ring-resonator-based EO polymer modulator.

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    This study presents a novel electro-optic (EO) ring resonator modulator. The device achieves a high resonance wavelength shift and efficient intensity modulation, paving the way for advanced photonic applications.

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    Area of Science:

    • Photonics and Optoelectronics
    • Materials Science
    • Electrical Engineering

    Background:

    • Electro-optic (EO) modulators are crucial components in optical communication and signal processing.
    • Ring resonator structures offer enhanced light-matter interaction for efficient modulation.
    • Developing modulators with high performance and compatibility with active materials is an ongoing challenge.

    Purpose of the Study:

    • To design and fabricate a novel electro-optic ring resonator modulator.
    • To optimize waveguide structure for single-mode operation and efficient mode confinement.
    • To achieve high resonance wavelength shift and effective intensity modulation.

    Main Methods:

    • Design and fabrication of a waveguide modulator with a titanium dioxide (TiO₂) core, silicon dioxide (SiO₂) buffer layer, and EO polymer claddings.
    • Optimization of TiO₂ and SiO₂ layer thicknesses to meet single-mode requirements.
    • Characterization of TM mode confinement and poling effectiveness of the EO polymer.
    • Measurement of resonance wavelength shift and intensity modulation performance.

    Main Results:

    • Achieved single-mode operation with 52.5% TM mode confinement in EO polymer layers.
    • Demonstrated effective poling of the EO polymer irrespective of its resistivity.
    • Observed a high resonance wavelength shift of 2.25 × 10⁻² nm/V.
    • Attained an intensity modulation with Vp-p = 1.9 V for a 3dB distinction ratio at 1550 nm.

    Conclusions:

    • The designed EO ring resonator modulator exhibits excellent performance characteristics.
    • The optimized structure facilitates efficient light-wave interaction and modulation.
    • This work contributes to the development of high-performance electro-optic devices for photonic applications.