To realize the refractive index dispersion accurately is essential for the design of optical devices. In this paper, we study hexagonal ZnO microrod cavities. We measure angle-resolved photoluminescence and use an iterative method to derive the refractive index dispersion near the band edge. Because of the large exciton binding energy in bulk ZnO, the photogenerated excitons are stable at room temperature. As a result, excitons could significantly affect the refractive index dispersion near the resonance energy. Thus, we construct a modified Lorentz oscillator model to extract the transverse and longitudinal exciton resonance energy and the damping term due to the scattering between LO-phonons and excitons at room temperature. The Rabi splitting energy and zero detuning point obtained by this method are reliable. The dispersion relations of polaritons measured by our angle-resolved photoluminescence agree well with the dispersion relation of polaritons, deduced by using the refractive index dispersion and optical parameters obtained by our theoretical model, thus, lending support to our theoretical model and the extracted parameters.

中文翻译：

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用光致发光光谱法测定耳语画廊微腔中激子-偏光效应引起的色散关系和光学参数

准确地实现折射率色散对于光学器件的设计至关重要。在本文中，我们研究了六角形ZnO微棒腔。我们测量角度分辨的光致发光，并使用迭代方法得出带边缘附近的折射率色散。由于块状ZnO中的激子结合能大，因此光生激子在室温下很稳定。结果，激子会显着影响共振能量附近的折射率色散。因此，我们构建了一个改进的洛伦兹振荡器模型，以提取横向和纵向激子共振能量以及由于室温声振子和激子之间的散射引起的阻尼项。通过该方法获得的拉比分裂能和零失谐点是可靠的。