Ramazan Şahin, PhD

Atatürk University · Faculty of Science

The physics of light at the nanoscale

Ramazan Şahin, PhD

Ramazan Şahin, PhD

Department of Astronomy and Space Sciences

Plasmonics, quantum optics and ultrafast nano-optics: I study light–matter interaction in metallic nanostructures and the active control of extraordinary optical transmission.

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About

From laser physics to quantum plasmonics

Professor at Atatürk University's Faculty of Science, working theoretically and experimentally on plasmonics, Fano interference and quantum optics.

I took my bachelor's degree at Akdeniz University's Faculty of Arts and Sciences and my master's and doctorate at Istanbul Technical University's Graduate School of Science; my doctoral thesis was on nanostructuring and characterising thin films by femtosecond laser ablation. Between 2015 and 2026 I was a faculty member at Akdeniz University, and since 2026 I have been a professor in the Department of Astronomy and Space Sciences at Atatürk University's Faculty of Science. My research concentrates on light–matter interaction in metallic nanostructures: voltage- and pulse-controlled extraordinary optical transmission, Fano interference with quantum emitters, plasmonic enhancement of the refractive index and single-molecule-resolution near-field microscopy. I have led projects supported by TÜBİTAK's 1001 and 3501 programmes, and I also serve as technical deputy director for the DAG and TUG campuses of the National Observatories of Türkiye.

Figure 1. The common set-up of the work: (a) an ultrashort light pulse, (b) a nanohole metal film with a quantum emitter placed in one hole, under bias, (c) a Fano resonance shifted by the voltage. Schematic.

Research

Research areas

I work theoretically and experimentally where quantum optics, nanoscience and optics meet.

Nanohole array biased through nanowire electrodes

Quantum emitter in a nanorod gap and Fano interference

Near-field microscopy: AFM tip over a defect in a 2D lattice

Integrated photonics: ring resonator and waveguide

Figure 2. Schematic drawings of the set-ups studied.

Extraordinary Optical Transmission

Active control of light transmitted through sub-wavelength hole arrays via Fano resonances, bias voltage and ultrashort pulses.

Fano Interference and Quantum Emitters

Electrical tuning of radiative decay rates through plasmon–emitter coupling; Stark control of plexcitonic states.

Ultrafast and Nonlinear Plasmonics

Temporal dynamics of plasmon resonances, second-harmonic lifetime extension and all-optical enhancement of the refractive index.

Near-Field Optical Imaging

Single-molecule-resolution near-field optical microscopy via plasmon lifetime extension and Fano interference.

Laser Micro- and Nanostructuring

Patterning graphene, metal thin films, ITO and silicon surfaces with femtosecond and nanosecond pulses and Bessel beams.

Active Photonic Devices

Photonic-crystal switches tuned by plasmonic index enhancement and actively controlled elements for integrated photonics.

Publications

Selected publications

  1. 2026

    Continuous and reversible electrical-tuning of fluorescent decay rate via Fano resonance

    Emre Ozan Polat, Zafer Artvin, Yusuf Şaki, Alpan Bek, Ramazan Sahin

    Nanotechnology 37(16), 165701

    DOI 10.1088/1361-6528/ae5cac (opens in a new tab)
  2. 2026

    Off-resonant Fano-enhanced single-molecule-resolution imaging with a CW source

    Rasim Volga Ovali, Taner Tarik Aytas, Ramazan Sahin, Mehmet Emre Tasgin

    Nanoscale

    DOI 10.1039/D6NR02277D (opens in a new tab)
  3. 2026

    Active tuning of ENZ resonances in a meta-antenna through phase modulation of an optical pulse

    Elif Ozturk, Hira Asif, Mehmet Gunay, Mehmet Emre Tasgin, Ramazan Sahin

    Journal of the Optical Society of America B 43(3), 375

    DOI 10.1364/JOSAB.579875 (opens in a new tab)
  4. 2024

    Voltage-controlled extraordinary optical transmission in the visible regime

    Hira Asif, Alpan Bek, Mehmet Emre Tasgin, Ramazan Sahin

    Physical Review B 109(12), 125425

    DOI 10.1103/PhysRevB.109.125425 (opens in a new tab)
All publications (8)

Research funding

Projects

Research projects funded by TÜBİTAK and the university, and my role in a national research infrastructure.

  1. TÜBİTAK 1001

    Using plasmonic index enhancement for the active control of photonic devices and studying its quantum-optical properties

    Principal investigator

    2023–2026
  2. Research infrastructure

    National Observatories of Türkiye: DAG and TUG campuses

    Technical deputy director

    Current
  3. TÜBİTAK 3501

    Quantum-plasmonic control of extraordinary optical transmission

    Principal investigator

    2021–2024
  4. University infrastructure project

    Interaction of nanosecond-pulsed non-diffracting laser beams with materials, and its applications

    Principal investigator

    2017–2019
  5. TÜBİTAK 1007

    High-power laser system

    2015–2016
  6. TÜBİTAK 1001

    Multi-frequency non-contact atomic force microscope operating in ultra-high vacuum

    Researcher

    2010–2011

Curriculum Vitae

Academic positions

Chronology, institution and role.

  1. 2026 — present

    Professor — Atatürk University

    Faculty of Science, Department of Astronomy and Space Sciences.

  2. Current

    Technical Deputy Director — National Observatories of Türkiye

    Eastern Anatolia Observatory (DAG, Erzurum, 3,170 m) and TÜBİTAK National Observatory (TUG, Antalya, 2,550 m) campuses.

  3. 2020 — 2026

    Associate Professor — Akdeniz University, Physics

    Head of division (2020–2026) and deputy head of department (2020–2024).

  4. 2019

    Assistant Professor — Middle East Technical University

  5. 2016 — 2017

    Researcher — TÜBİTAK BİLGEM UEKAE

    Research post outside academia.

  6. 2015 — 2020

    Assistant Professor — Akdeniz University

    Vocational School of Technical Sciences, Electricity and Energy; commission member (2017–2019).

  7. 2009 — 2015

    Research Assistant — Istanbul Technical University

  8. 2009 — 2015

    PhD — Istanbul Technical University

    Nanostructuring and characterisation of thin films by femtosecond laser ablation.

  9. 2007 — 2009

    MSc — Istanbul Technical University

    Multi-frequency atomic force microscopy and its applications.

  10. 2002 — 2006

    BSc — Akdeniz University

    Faculty of Arts and Sciences.

Theses

Research group

Five graduate theses I supervised have been completed; we carry out theoretical and experimental work together with the students.

HA

Hira Asif

PhD · 2024

Quantum-plasmonic control of extraordinary optical transmission

AG

Aslı Gençaslan

PhD · 2023

Photonic and quantum-plasmonic applications of group-IV nitrides

İG

İ. Göktaş

MSc · 2024

A comparison of the properties of solar cells with different structures

TT

Taner Tarık Aytaş

MSc · 2023

Graphene as an active medium in plasmonic structures

DA

D. Aynur

MSc · 2019

Theoretical, computational and experimental study of Bessel beams

Let's work together

Write to me for scientific collaboration and thesis supervision.

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Contact

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Atatürk University Faculty of Science, Dept. of Astronomy and Space Sciences, Erzurum

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