Optical Characterization and Comparative Investigation of Cylindrical and Spherical Optical Microcavities

Gökçe Dündar; Kerem Anar; Namık Akçay; Mustafa Eryürek

doi:10.29002/asujse.1650656

EN TR

Optical Characterization and Comparative Investigation of Cylindrical and Spherical Optical Microcavities

Abstract

This study focuses on the optical excitation and characterization of cylindrical and spherical microcavities using tapered optical fibers. Optical microcavity technologies offer significant potential for optical sensing applications requiring ultra-high sensitivity. In this study, the interaction mechanisms between tapered fiber structures and microcavities were examined in detail, and the properties of so-called “whispering gallery mode” (WGM) resonances were analyzed. Cylindrical microcavities provide a sensitive sensing platform against environmental changes due to their simple geometric structures, while spherical microcavities stand out with their symmetrical shapes and higher quality factors (Q-factors). These structures play a critical role in enhancing spectral resolution and achieving precise measurements in optical sensing. In the experimental setup, adiabatic tapering techniques were employed to fabricate tapered optical fibers, and the efficiency of fiber-microcavity interactions was optimized. This setup allowed for resolving WGMs spectrally making precise measurement of Q-factors possible. Larger free spectral ranges (FSR) were obtained with cylindrical microcavities, whereas spherical microcavities achieved extremely high Q-factors with denser mode spectra. The results revealed the critical impact of geometric properties, fabrication quality, and alignment precision of microcavities on optical performance. This study provides a significant foundation for the integration of tapered fiber-based microcavities into advanced sensing technologies. In the future, optimizing fabrication techniques and system geometries could further enhance the sensitivity and performance of microcavities.

Keywords

Silindirik ve Küresel Optik Mikrokovukların Karakterizasyonunun İncelenmesi ve Karşılaştırılması

Öz

Bu çalışma, inceltilmiş optik fiberler kullanılarak silindirik ve küresel mikrokovukların optik uyarımı ve karakterizasyonuna odaklanmaktadır. Optik mikrokovuk teknolojileri, çok yüksek hassasiyet gerektiren optik algılama uygulamalarında önemli bir potansiyel sunmaktadır. Bu çalışmada, inceltilmiş fiber yapıların mikrokovuklarla etkileşim mekanizmaları detaylı bir şekilde incelenmiş ve rezonans modlarının (WGM) özellikleri çözülmüştür. Silindirik mikrokovuklar, basit geometrik yapıları sayesinde çevresel değişikliklere karşı duyarlı bir algılama platformu sunarken, küresel mikrokovuklar şekilsel simetrileri ve daha yüksek Q-faktörleri ile öne çıkmaktadır. Bu yapılar, optik algılamada spektral çözünürlüğü arttırmak ve daha hassas ölçümler yapmak için kritik bir rol oynar. Deneysel düzenekte, inceltilmiş optik fiberlerin üretiminde adyabatik inceltme teknikleri kullanılmış ve fiber-mikrokovuk etkileşiminin verimliliği optimize edilmiştir. Bu düzenek, hem rezonans modlarının çözülmesine hem de Q-faktörünün hassas bir şekilde ölçülmesine olanak tanımıştır. Silindirik mikrokovuklarda daha büyük serbest spektral aralıklar (FSR) elde edilirken, küresel mikrokovuklar daha yoğun mod spektrumları ile çok yüksek Q-faktörlerine ulaşmıştır. Sonuçlar, mikrorezonatörlerin geometrik özellikleri, üretim kalitesi ve hizalama hassasiyetinin optik performans üzerindeki kritik etkisini ortaya koymuştur. Bu çalışma, inceltilmiş fiber tabanlı mikrokovukların ileri algılama teknolojilerine entegrasyonu için önemli bir temel sunmaktadır. Gelecekte, üretim tekniklerinin ve system geometrilerinin optimize edilmesi ile mikrokovukların duyarlılığını ve performansını daha da artırmak mümkün olabilecektir.

Anahtar Kelimeler

Destekleyen Kurum

TÜBİTAK BİLGEM UEKAE

Proje Numarası

121C216

Etik Beyan

Sunduğumuz makalenin orijinal olduğunu; herhangi bir başka dergiye yayınlanmak üzere verilmediğini, daha önce yayınlanmadığını garanti ederiz.

Teşekkür

This work was supported by TÜBİTAK BİDEB (Project Number: 121C216).

Kaynakça

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Ayrıntılar

Birincil Dil

İngilizce

Konular

Fotonik, Optoelektronik ve Optik İletişim

Bölüm

Araştırma Makalesi

Yazarlar

Gökçe Dündar ^*
0000-0002-7876-5818
Türkiye

Kerem Anar
0009-0005-7168-5144
Türkiye

Namık Akçay
0000-0003-1660-213X
Türkiye

Mustafa Eryürek
0000-0001-8612-3164
Türkiye

Erken Görünüm Tarihi

28 Nisan 2025

Yayımlanma Tarihi

30 Haziran 2025

Gönderilme Tarihi

5 Mart 2025

Kabul Tarihi

21 Mart 2025

Yayımlandığı Sayı

Yıl 1970 Cilt: 9 Sayı: 1

DOI

https://doi.org/10.29002/asujse.1650656

IZ

https://izlik.org/JA99YL74MN

Kaynak Göster

RIS / Bibtex

APA

Dündar, G., Anar, K., Akçay, N., & Eryürek, M. (2025). Optical Characterization and Comparative Investigation of Cylindrical and Spherical Optical Microcavities. Aksaray University Journal of Science and Engineering, 9(1), 35-44. https://doi.org/10.29002/asujse.1650656