Journal
OPTICS LETTERS
Volume 40, Issue 12, Pages 2866-2869Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.40.002866
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Funding
- Japan Society for the Promotion of Science (JSPS) [24000013]
- Program to Disseminate Tenure Tracking System, Japan Science and Technology Agency (JST)
- Toyota Physical and Chemical Research Institute (Scholar Project)
- Grants-in-Aid for Scientific Research [24000013] Funding Source: KAKEN
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Using room temperature photoluminescence measurements, we have demonstrated a sensing operation based on hexagonal GaN microdisks with a side length of approximately 1.5 mu m that acted as optical microcavities. In the experiment, the optical microresonant systems based on the whispering-gallery mode (WGM) in the microdisks were affected by their ambient conditions, resulting in shifts of the lasing wavelength by varying the mixing ratios of isopropanol and o-xylene. We also obtained such shifts for aqueous solutions with varying sucrose concentrations. In addition, we demonstrated that tiny waterborne particles can be detected using a microdisk. These results indicate that the WGM in the hexagonal GaN microdisks potentially can be used to develop optical microbiosensors that can evaluate a limited area with a radius of 1-2 mu m. (C) 2015 Optical Society of America
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