2018 Fiscal Year Final Research Report
Novel optical phenomena in non-Hermitian microcavities
| Project/Area Number |
16K04974
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Optical engineering, Photon science
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| Research Institution | Kanazawa University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | 非エルミート光学 / 例外点 / exceptional point / 微小共振器 |
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| Outline of Final Research Achievements |
We numerically and theoretically studied optical phenomena in microcavities operating near exceptional points (EPs). The main results are as follows: (1) frequency splitting due to rotation can be enhanced in a ring resonator with a complex periodic structure. This opens a novel way of sensitivity enhancement toward on-chip optical gyroscopes.
(2) The frequency response function near an EP was derived. It was shown that the response can be enhanced in proportional to the fourth power of the loss rate of an optical cavity. (3) A novel laser operating at an EP was proposed. It was also shown that the laser linewidth can greatly be broadened, compared to normal lasers that do not operate an EP, suggesting that the laser coherence can be changed by using an EP.
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| Free Research Field |
応用光学・量子光工学
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| Academic Significance and Societal Importance of the Research Achievements |
工学の観点において，エネルギー損失は低減するべきものとみなされてきたが，本研究によって，エネルギー損失はEPを発現させ，新規の光学現象を発現させる重要な要因であることが明らかにされ，そのセンシングやレーザ発振への応用展開が議論された．特に，回転摂動に対する周波数シフト増大は，光ジャイロ等のセンサへの応用に対して重要であり，応答強度増幅効果と合わせて，より一般的なセンシング感度増強法へ発展できる．また，本研究では，EPレーザを提案し線幅増大が生じることを示した．この結果は，コヒーレンスを可変する新しい手法になると期待できる．
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