High-Order Resonant Peaks and Polarization Dependence of Microphotoluminescence in Whispering-Gallery Mode ZnO Microrod Cavity

High order phenomena in the visible range and with polarization dependence in the ultraviolet (UV) region of the microphotoluminescence (micro-PL) spectrum in whispering-gallery mode (WGM) ZnO microrod cavity have been thoroughly studied at room temperature. WGM ZnO microrod cavity with good crystallinity is produced by the CVD growth method, and the ZnO microrod structures are characterized by structural and optical methods. Through the micro-PL spectrum measurement of the ZnO microrod, it is found that high-order resonance peaks appeared in the visible region. The different polarization conditions can be adjusted by rotating the angles of the polarizer, and it is proved that the micro-PL spectrum has strong polarization-dependent behavior in the UV region. Our results imply broad application potentials in the study of ZnO microrod-based photonic cavity devices.

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Terahertz Gyro-BWO Using a High-Order Whispering-Gallery mode

2019 International Vacuum Electronics Conference (IVEC) ◽

10.1109/ivec.2019.8745150 ◽

2019 ◽

Author(s):

Shi Pan ◽

Chao-Hai Du ◽

Zi-Chao Gao ◽

Fan-Hong Li ◽

Hui-Qi Bian ◽

...

Keyword(s):

Whispering Gallery Mode ◽

High Order ◽

Whispering Gallery

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Generation of high order Bessel beams with whispering gallery mode resonators

2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference ◽

10.1109/cleo.2006.4627587 ◽

2006 ◽

Author(s):

Anatoliy A. Savchenkov ◽

Ivan Grudinin ◽

Ekaterina A. Savchenkova ◽

Dmitry Strekalov ◽

Andrey B. Matsko ◽

...

Keyword(s):

Whispering Gallery Mode ◽

High Order ◽

Bessel Beams ◽

Whispering Gallery

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Visible range whispering-gallery mode in microdisk array based on size-controlled Si nanocrystals

Applied Physics Letters ◽

10.1063/1.2195712 ◽

2006 ◽

Vol 88 (15) ◽

pp. 153120 ◽

Cited By ~ 33

Author(s):

Rong-Jun Zhang ◽

Se-Young Seo ◽

Alexey P. Milenin ◽

Margit Zacharias ◽

Ulrich Gösele

Keyword(s):

Whispering Gallery Mode ◽

Visible Range ◽

Whispering Gallery ◽

Si Nanocrystals ◽

Size Controlled

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Dominant Loss Mechanisms of Whispering Gallery Mode RF-MEMS Resonators with Wide Frequency Coverage

Sensors ◽

10.3390/s20247017 ◽

2020 ◽

Vol 20 (24) ◽

pp. 7017

Author(s):

Zeji Chen ◽

Qianqian Jia ◽

Wenli Liu ◽

Quan Yuan ◽

Yinfang Zhu ◽

...

Keyword(s):

Rf Mems ◽

Whispering Gallery Mode ◽

High Order ◽

Bulk Acoustic Wave ◽

Whispering Gallery ◽

Mems Resonators ◽

Major Loss ◽

Frequency Coverage ◽

Anchor Loss ◽

Loss Mechanisms

This work investigates the dominant energy dissipations of the multi-frequency whispering gallery mode (WGM) resonators to provide an insight into the loss mechanisms of the devices. An extensive theory for each loss source was established and experimentally testified. The squeezed film damping (SFD) is a major loss for all the WGMs at atmosphere, which is distinguished from traditional bulk acoustic wave (BAW) resonators where the high-order modes suffer less from the air damping. In vacuum, the SFD is negligible, and the frequency-dependent Akhiezer damping (AKE) has significant effects on different order modes. For low-order WGMs, the AKE is limited, and the anchor loss behaves as the dominant loss. For high-order modes with an extended nodal region, the anchor loss is reduced, and the AKE determines the Q values. Substantial Q enhancements over four times and an excellent f × Q product up to 6.36 × 1013 at 7 K were achieved.

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