Optimizing plasmonic photothermal therapy - A numerical study on tissue specific thermal and optical properties for cancer treatment

Sep 23, 2026

Effective cancer therapy requires precise targeting of malignant tissues while minimizing damage to healthy ones. This study numerically examines plasmonic photothermal therapy (PPTT) as a minimally invasive option, emphasizing how nanoparticle (NP) size, resonance wavelength, and biological tissue thermal properties interact. By matching NP characteristics to tissue-specific optical and thermal parameters, the work aims to improve heat delivery and therapeutic efficacy while reducing collateral effects. Results indicate that resonance wavelength shifts with NP size and that tissue thermal conductivity and refractive index shape temperature profiles, supporting optimization via computational modeling and experimental validation.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages11

Reading Time28 min

AccessFree to download

Introduction

Background and need for precision cancer therapy

Role of PPTT and hyperthermia

Plasmonic photothermal therapy mechanism

Nanoparticle excitation and temperature rise

Targeting cell death pathways (apoptosis and necrosis)

Gold nanoparticles in PPTT

Photothermal efficiency, biocompatibility, and NIR penetration

Localized surface plasmon resonance (LSPR) and light absorption

[www. nature.com/scientificreports](www. nature.com/scientificreports) OPEN Optimizing plasmonic photothermal therapy a numerical study on tissue specific thermal and optical properties for cancer treatment Omar Eladarousy1, Zahraa Zibara2, Khaled Hussari2, NissrineAl Helou1 & Rana Nicolas1􀀍 Effective cancer treatment demands precision to target malignant tissues while sparing healthy ones. This study investigates numerically the role of plasmonic photothermal therapy (PPTT) as a minimally invasive approach to achieve this goal, focusing on the interplay between nanoparticle (NP) size, resonance wavelength, and the thermal properties of biological tissues. Tailoring NP characteristics to align with tissue-specific optical and thermal properties enables precise thermal delivery, enhancing therapeutic efficacy while minimizing collateral damage. Resonance wavelength shifts with NP size, while tissue parameters like thermal conductivity and refractive index further influence temperature profiles. These findings highlight the importance of optimizing PPTT protocols through computational modeling and experimental validation. This approach advances personalized cancer therapies, offering safer and more effective treatment outcomes. Cancer is considered a primary cause of death and a prominent obstruction to increasing life expectancy worldwide1. Recent global cancer statistics reveal that in 2020, there were approximately 20 million new cancer cases and 9.7 million cancer-related deaths worldwide1. The available treatments vary according to to the typeof the tumor and the time it was diagnosed and its aggressiveness. Tumors detected in early stages can be removed immediately through surgical intervention. However, it can increase the risk of developing secondary cancer2, and if tumors are located in sensitive organs, such as the brain and pancreas, surgical intervention would be difficult without damaging surrounding tissues3. These cases require a nonphysical approach, such as radiation therapy and chemotherapy, but these techniques are invasive, have severe side effects, and impact the patient’s quality of life4. This study focuses on the numerical investigation of Plasmonic photothermal therapy, an emerging non-invasive alternative therapy. Plasmonic Photothermal Therapy (PPTT) is a technique that employs electromagnetic energy to excite metallic nanoparticles, leading to a localized increase in temperature through light-to-heat conversion5, inducing hyperthermia. Tumor cells exhibit a heightened sensitivity to temperature increases due to poorer blood supply compared to normal tissue, which allows for selective targeting of cancerous tissues without significantly impacting the local environment. Hyperthermia promotes cell death either through the physical loosening of cellular membranes6 or by the induction of cell death pathways. Cell death pathways can be selectively induced depending on the overall temperature increase produced through PPTT7,8. The main targeted cell death pathways are apoptosis and necrosis, with apoptosis being the more suitable option due to its ordered signaling pathways compared to the randomness of necrosis. Another factor that favors apoptosis is the fact that necrotic events release intracellular materials that trigger inflammation and immune responses9. Variations in the physical characteristics of the tumor, the characteristics of neighboring tissues, the thermal conductivity, and the tissue index of refraction are all factors that promote variations in results and should be taken into account. Plasmonic photothermal therapy was derived from photodynamic therapy and photothermal therapy, which employed chemical photo synthesizers and light absorbing dyes, respectively10–12. Plasmonic photothermal therapy (PPTT) enhances traditional photothermal therapy (PTT) by utilizing plasmonic nanoparticles, such as gold nanoparticles, which offer higher photothermal conversion efficiency and tunab

FAQs

How does the study position plasmonic photothermal therapy (PPTT) as a cancer treatment?

PPTT is presented as a minimally invasive, non-invasive alternative that can selectively target malignant tissues by converting light into localized heat (hyperthermia). The study focuses on how to tune therapy parameters to improve precision and reduce collateral damage.

What key variables are investigated for optimizing PPTT?

The study highlights the interplay between nanoparticle size, resonance wavelength, and tissue thermal properties. Changes in NP size shift the resonance wavelength, while tissue thermal conductivity and refractive index influence the resulting temperature profiles.

Why are gold nanoparticles (AuNPs) commonly used in PPTT in this work?

AuNPs are described as widely used due to high photothermal conversion efficiency, biocompatibility, and stability, along with tunable plasmon resonance in the NIR window for deeper tissue penetration. Their resistance to oxidation also supports biomedical use.

Sep 23, 2026

Uploaded by WPS_1786070896