Near-Field Radiation Interaction With Molecules in Optical Microcavity

2007 ◽  
Author(s):  
Zhixiong Guo ◽  
Haiyong Quan
Keyword(s):  
Near Field ◽  
Evanescent Field ◽  
Air Gap ◽  
Whispering Gallery Modes ◽  
Optical Resonance ◽  
Optical Microcavity ◽  
Whispering Gallery ◽  
Field Radiation ◽  
Molecule Interactions ◽  
Induced Changes

Evanescent radiation-molecule interactions in an optical microcavity device are characterized. The device is operated at whispering-gallery modes, and consists of a microcavity and a micro-waveguide coupled by a sub-micrometer air-gap. Under optical resonance, a strong evanescent field arises along the periphery of the circular resonating microcavity. This radiation will certainly interact with molecules inside the field and may induce changes in the resonant field. Such induced changes are investigated and its potential in the detection of single molecules is discussed.

scholarly journals Experimental analysis of the whispering-gallery modes in a cylindrical optical microcavity

2001 ◽  
Vol 18 (4) ◽  
pp. 465 ◽  
Author(s):  
M. L. M. Balistreri ◽  
D. J. W. Klunder ◽  
F. C. Blom ◽  
A. Driessen ◽  
J. P. Korterik ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Whispering Gallery Modes ◽  
Optical Microcavity ◽  
Whispering Gallery

Increasing the Q-factor of thin planar dielectric resonator with whispering gallery modes

2020 ◽  
Vol 12 (10) ◽  
pp. 960-968
Author(s):  
A. E. Kogut ◽  
M. T. Islam ◽  
E. A. Kogut ◽  
Z. E. Eremenko ◽  
R. S. Dolia
Keyword(s):  
Dielectric Resonator ◽  
Dielectric Waveguide ◽  
Air Gap ◽  
Whispering Gallery Modes ◽  
Dielectric Resonators ◽  
Q Factor ◽  
Energy Characteristics ◽  
Excitation Efficiency ◽  
Whispering Gallery ◽  
Dielectric Disk

AbstractThe spectral and energy characteristics of the tunable thin planar dielectric resonator with the movable metal mirror are researched. It is found that the high-Q HE-polarized whispering gallery modes (WGMs) are effectively excited in such a resonator by the dielectric waveguide. A mode set of the tunable thin planar dielectric resonator depends on the presence of an air gap in its design. Changing the height of the air gap affects the energy characteristics of the tunable thin planar dielectric resonators (DR). Shifting the resonant fields of WGMs from the dielectric disk to the air gap is the reason for this effect. It is shown that at certain heights of the air gap, increasing the unloaded Q-factor of the tunable thin planar DR and improving the excitation efficiency of WGMs in it is achieved.

Side-mode suppression in ultraviolet quasi-semicircle microlaser cavity

2020 ◽  
Vol 34 (30) ◽  
pp. 2050330
Author(s):  
Canran Zhang ◽  
Gangyi Zhu ◽  
Siqing He ◽  
Jun Dai
Keyword(s):  
Near Field ◽  
Distribution Patterns ◽  
Mode Competition ◽  
Optically Pumped ◽  
Optical Resonance ◽  
Whispering Gallery ◽  
Mode Suppression ◽  
Resonance Modes ◽  
Optical Modes ◽  
Side Mode

We report a quasi-semicircle GaN ultraviolet microcavity laser. Poincaré map of the quasi-semicircle cavity shows periodic, quasi-periodic and chaotic optical trajectories. Finite-element-method optical near-field distribution patterns of the periodic optical modes agree with the optical loops in the quasi-semicircle cavity. Based on the numerical results, optically pumped lasing experiment shows that ultraviolet multimode lasing action from different optical resonance modes can be effectively stimulated at low pumping intensity in the quasi-semicircle GaN cavity, and the side-mode suppression phenomenon can be obtained at high pumping intensity. Because the possible period optical loops are quasi-periodic and unstable, the quasi-whispering-gallery mode lasing with higher quality factor prefer to dominate the lasing action under high pumping. The experimental and simulated lasing modes suggest that side-mode suppression phenomenon can be caused by the mode competition between quasi-whispering-gallery modes and other quasi-periodic modes.

Mapping whispering-gallery modes in microspheres with a near-field probe

1995 ◽  
Vol 20 (14) ◽  
pp. 1515 ◽  
Author(s):  
J. C. Knight ◽  
N. Dubreuil ◽  
V. Sandoghdar ◽  
J. Hare ◽  
V. Lefèvre-Seguin ◽  
...  
Keyword(s):  
Near Field ◽  
Whispering Gallery Modes ◽  
Whispering Gallery
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