Positive and negative phototunability of chalcogenide (AMTIR-1) microdisk resonator

Neetesh Singh, Darren D. Hudson, Rongping Wang, Eric C. Mägi, Duk Yong Choi, Christian Grillet, Barry Luther-Davies, Stephen Madden, Benjamin J. Eggleton

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


We demonstrate externally photo-induced partially-reversible tuning of the resonance of a microdisk made of AMTIR-1 (Ge33As12e55). We have achieved for the first time, to the best of our knowledge, both positive and negative shift in a microresonator with external tuning. A positive resonance shift of 1 nm and a negative resonance shift of 0.5 nm on a single microdisk has been measured. We have found that this phenomenon is due to initial photo-expansion of the microdisk followed by the photo-bleaching of the AMTIR-1. The observed shifts and the underlying phenomenon is controllable by varying the illumination power (i.e. the low power illumination suppresses the photobleaching process). We measure a loaded quality factor of 1.2×105 at 1550nm (limited by the measuring instrument). This holds promise for non-contact low power reversible-tunning of photonic circuit elements.

Original languageEnglish
Pages (from-to)8681-8686
Number of pages6
JournalOptics Express
Issue number7
Publication statusPublished - 6 Apr 2015
Externally publishedYes


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