Electro-optically tunable barium–strontium–titanate filter for the 2 μm wavelength range

Mojdeh Vakili Tabatabaei; Samu-Pekka Ojanen; Jukka Viheriälä; Ifte Khairul Alam Bhuiyan; Yating Ruan; Philipp Komissinskiy; Lambert Alff; Mircea Guina; Sascha Preu

doi:10.1063/5.0307690

Electro-optically tunable barium–strontium–titanate filter for the 2 μm wavelength range

Mojdeh Vakili Tabatabaei^*
, Samu-Pekka Ojanen
, Jukka Viheriälä
, Ifte Khairul Alam Bhuiyan
, Yating Ruan
, Philipp Komissinskiy
, Lambert Alff
, Mircea Guina
, Sascha Preu

^*Tämän työn vastaava kirjoittaja

Tutkimustuotos: Artikkeli › Tieteellinen › vertaisarvioitu

2 Lataukset (Pure)

Abstrakti

We demonstrate a tunable optical bandpass filter with maximum transmittance of 67% based on a thin film substrate-transferred Ba_0.5Sr_0.5TiO₃ (BST) layer integrated into a Fabry–Pérot cavity, designed for operation at 2 μm. The filter structure consists of a 450 nm BST film sandwiched between two distributed Bragg reflector mirrors composed of alternating TiO₂ and SiO₂ layers. Electrodes patterned directly onto the BST layer enabled the application of an in-plane electric field, inducing a blue shift of the central wavelength via the quadratic electro-optic effect. Optical characterization reveals a maximum spectral tunability of 3.8 nm under a 210 V DC bias. Our results highlight both the feasibility and design trade-offs of using paraelectric BST for tunable integrated photonic filters in the 2 μm wavelength range.

Alkuperäiskieli	Englanti
Artikkeli	046108
Julkaisu	APL Photonics
Vuosikerta	11
Numero	4
DOI - pysyväislinkit	https://doi.org/10.1063/5.0307690
Tila	Julkaistu - huhtik. 2026
OKM-julkaisutyyppi	A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Julkaisufoorumi-taso

Jufo-taso 2

!!ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Computer Networks and Communications

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10.1063/5.0307690Lisenssi: CC BY

Electro-optically tunable barium–strontium–titanate filter for the 2 μm wavelength rangeFinal published version, 6,37 MBLisenssi: CC BY

https://urn.fi/URN:NBN:fi:tuni-202606247918Lisenssi: CC BY

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title = "Electro-optically tunable barium–strontium–titanate filter for the 2 μm wavelength range",

abstract = "We demonstrate a tunable optical bandpass filter with maximum transmittance of 67\% based on a thin film substrate-transferred Ba0.5Sr0.5TiO3 (BST) layer integrated into a Fabry–P{\'e}rot cavity, designed for operation at 2 μm. The filter structure consists of a 450 nm BST film sandwiched between two distributed Bragg reflector mirrors composed of alternating TiO2 and SiO2 layers. Electrodes patterned directly onto the BST layer enabled the application of an in-plane electric field, inducing a blue shift of the central wavelength via the quadratic electro-optic effect. Optical characterization reveals a maximum spectral tunability of 3.8 nm under a 210 V DC bias. Our results highlight both the feasibility and design trade-offs of using paraelectric BST for tunable integrated photonic filters in the 2 μm wavelength range.",

author = "\{Vakili Tabatabaei\}, Mojdeh and Samu-Pekka Ojanen and Jukka Viheri{\"a}l{\"a} and \{Alam Bhuiyan\}, \{Ifte Khairul\} and Yating Ruan and Philipp Komissinskiy and Lambert Alff and Mircea Guina and Sascha Preu",

note = "Publisher Copyright: {\textcopyright} 2026 Author(s).",

year = "2026",

month = apr,

doi = "10.1063/5.0307690",

language = "English",

volume = "11",

journal = "APL Photonics",

issn = "2378-0967",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Electro-optically tunable barium–strontium–titanate filter for the 2 μm wavelength range

AU - Vakili Tabatabaei, Mojdeh

AU - Ojanen, Samu-Pekka

AU - Viheriälä, Jukka

AU - Alam Bhuiyan, Ifte Khairul

AU - Ruan, Yating

AU - Komissinskiy, Philipp

AU - Alff, Lambert

AU - Guina, Mircea

AU - Preu, Sascha

PY - 2026/4

Y1 - 2026/4

N2 - We demonstrate a tunable optical bandpass filter with maximum transmittance of 67% based on a thin film substrate-transferred Ba0.5Sr0.5TiO3 (BST) layer integrated into a Fabry–Pérot cavity, designed for operation at 2 μm. The filter structure consists of a 450 nm BST film sandwiched between two distributed Bragg reflector mirrors composed of alternating TiO2 and SiO2 layers. Electrodes patterned directly onto the BST layer enabled the application of an in-plane electric field, inducing a blue shift of the central wavelength via the quadratic electro-optic effect. Optical characterization reveals a maximum spectral tunability of 3.8 nm under a 210 V DC bias. Our results highlight both the feasibility and design trade-offs of using paraelectric BST for tunable integrated photonic filters in the 2 μm wavelength range.

AB - We demonstrate a tunable optical bandpass filter with maximum transmittance of 67% based on a thin film substrate-transferred Ba0.5Sr0.5TiO3 (BST) layer integrated into a Fabry–Pérot cavity, designed for operation at 2 μm. The filter structure consists of a 450 nm BST film sandwiched between two distributed Bragg reflector mirrors composed of alternating TiO2 and SiO2 layers. Electrodes patterned directly onto the BST layer enabled the application of an in-plane electric field, inducing a blue shift of the central wavelength via the quadratic electro-optic effect. Optical characterization reveals a maximum spectral tunability of 3.8 nm under a 210 V DC bias. Our results highlight both the feasibility and design trade-offs of using paraelectric BST for tunable integrated photonic filters in the 2 μm wavelength range.

UR - https://www.scopus.com/pages/publications/105035704863

U2 - 10.1063/5.0307690

DO - 10.1063/5.0307690

M3 - Article

AN - SCOPUS:105035704863

SN - 2378-0967

VL - 11

JO - APL Photonics

JF - APL Photonics

IS - 4

M1 - 046108

ER -

Electro-optically tunable barium–strontium–titanate filter for the 2 μm wavelength range

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