Mr. Krishnendu Maji Profile

Krishnendu Maji

at IISER Kolkata

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 20 August 2020 Poster + Presentation + Paper

Directed self-assembly of a bio-inspired peptide into ring microstructures using micro-bubbles induced in thermo-optical tweezers

Roshan Tiwari, Krishnendu Maji, Ajmal Aji, Subhrokoli Ghosh, Debasish Haldar, Nirmalya Ghosh, Ayan Banerjee

Proceedings Volume 11463, 1146320 (2020) https://doi.org/10.1117/12.2568087

KEYWORDS: Microrings, Waveguides, Spectroscopy, Scattering, Waveguide modes, Light scattering, Directed self assembly, Microscopes, Molecular self-assembly

Read Abstract +

Molecular self-assembly has been recognized as an important technique for organizing building blocks into ordered structures with promising applications in various fields. Spontaneous self-assembly of diphenylalanine(FF) pep- tide derivatives which have remarkable sequence similarity with Alzheimer’s Aβ peptide, give rise to micro-rods and microtubes. But, the reported structures suffer from a lack of control. Herein, we report a new technique for laser-assisted self-assembly of diphenylanaline where we obtain stable annular ring microstructures using thermo-optical tweezers. In this method, a dense aqueous dispersion of the material which has high absorption at the laser wavelength is taken in a sample holder so that some material is adsorbed on the top surface. A hot spot is created on the top surface when the adsorbed material absorbs the high intensity at the focus of the laser beam, giving rise to a water vapor bubble. Due to Gibbs Marangoni convection, self-assembly of FF peptides occurs around the bubble in the form of rings. This method of fabricating rings is fast with complete control over the spatial location, size, and thickness of the rings. Interestingly, these self-assembled ring struc- tures display wave-guiding and spectrally asymmetric Fano resonances. We demonstrate the potential of such micro-structures in sensing by changes in their Fano spectral line and wave-guiding response on binding with Congo red dye, which is commonly used to stain amyloid proteins. Such intriguing waveguiding systems may have promising applications in biological and chemical sensing, precision diagnostics of various neurodegenerative diseases and in the fabrication of multifarious micro-optical devices.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years