TY - JOUR
T1 - Emission spectra of hexagonal zinc oxide microrods due to resonant modes
AU - Chen, Yu Da
AU - Ngo, Trong Huynh Buu
AU - Chang, Yia Chung
AU - Lin, Dai Jie
AU - Hsu, Hsu Cheng
PY - 2018/9/1
Y1 - 2018/9/1
N2 - Experimental observation and theoretical analysis of the whispering gallery mode (WGM) related emission spectra of ZnO microrods with a hexagonal cross-section are reported. ZnO microrods of various sizes are fabricated, and their individual geometric information (including the inner radius, edge profile modification, and tilt angle) are characterized via scanning electron microscopy (SEM). The photoluminescence spectra in the visible range (with energies between 1.77 and 2.76 eV) are compared with theoretical simulation based on Green function calculation within a nearly complete set of basis functions. WGM resonance peaks for TE and TM modes of five different sizes of microrods are analyzed. By using the SEM determined geometry with a slight adjustment, we obtain realistic simulation of the line shapes of the emission spectra, which agree well with experimental observation. To gain better understanding of the WGM resonance modes, we also calculate the WGM resonance profile of ZnO microrods with the cylindrical cross-section for both TE and TM modes for comparison.
AB - Experimental observation and theoretical analysis of the whispering gallery mode (WGM) related emission spectra of ZnO microrods with a hexagonal cross-section are reported. ZnO microrods of various sizes are fabricated, and their individual geometric information (including the inner radius, edge profile modification, and tilt angle) are characterized via scanning electron microscopy (SEM). The photoluminescence spectra in the visible range (with energies between 1.77 and 2.76 eV) are compared with theoretical simulation based on Green function calculation within a nearly complete set of basis functions. WGM resonance peaks for TE and TM modes of five different sizes of microrods are analyzed. By using the SEM determined geometry with a slight adjustment, we obtain realistic simulation of the line shapes of the emission spectra, which agree well with experimental observation. To gain better understanding of the WGM resonance modes, we also calculate the WGM resonance profile of ZnO microrods with the cylindrical cross-section for both TE and TM modes for comparison.
UR - http://www.scopus.com/inward/record.url?scp=85052757248&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85052757248&partnerID=8YFLogxK
U2 - 10.1364/JOSAB.35.002228
DO - 10.1364/JOSAB.35.002228
M3 - Article
AN - SCOPUS:85052757248
VL - 35
SP - 2228
EP - 2236
JO - Journal of the Optical Society of America B: Optical Physics
JF - Journal of the Optical Society of America B: Optical Physics
SN - 0740-3224
IS - 9
ER -